The boundary of a quark-gluon plasma affects the momentum distribution of quarks and consequently the magnitudes of signals for the search of the quark-gluon plasma.
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existence of the quark-gluon plasma. In such a state of matter, which ... the hadrons have dissolved into their constituent quarks and gluons. ...
NASA Website
Considerations for creating a quark-gluon plasma from relativistic heavy ion reactions and then detecting the quark matter are reviewed. (AIP)
The boundary of a quark-gluon plasma affects the momentum distribution of quarks in the plasma. In particular, a transverse boundary leads to a transverse momentum distribution with a shape different from the thermal distribution especially in the high tr...
National Technical Information Service (NTIS)
Current techniques to simulate the dynamical behavior of Quark-Gluon Plasma (QGP) reveal that the order of the phase transition as well as the values of the critical parameters depend on the number of quark flavors as well as on the quark-masses included ...
In this paper it is shown that the strangeness production in quark-gluon plasma might not serve as an experimental signature for the formation of quark-gluon plasma. Our results are completely based on the computer simulation of the plasma. We have taken ...
At high temperature, nuclear matter turns into a plasma made of the nucleon constituents, the quarks and the gluons which are then weakly interacting. Such a plasma, called the quark-gluon plasma, has many features in common with the electromagnetic plasm...
A realistic model is used for the phase transition between the color deconfining quark-gluon plasma phase and the color confining hadronic gas phase of nuclear matter to discuss the question how quarks and antiquarks hadronize in an expanding quark-gluon ...
Using Boltzman distribution in a quark-gluon plasma sample it is possible to obtain all existing magic numbers and their extensions without applying the spin and spin-orbit couplings. In this model it is assumed that in a quark-gluon thermodynamic plasma, quarks have no interactions and they ...
Under very general assumptions we show that the quark dispersion relation in the quark-gluon plasma is given by two collective branches, of which one has a minimum at a nonvanishing momentum. This general feature of the quark dispersion relation leads to structures (van Hove singularities, gaps) in the low mass ...
PubMed
Various aspects of the physics of the quark-gluon plasma are presented. Known properties of the transition from hadronic matter to the quark-gluon plasma are recalled. Progress in the phenomenology of ultra-relativistic heavy ion collisions is discussed o...
Upcoming heavy ion experiments at the AGS and SPS are aimed at producing and diagnosing a primordial form of matter, the quark-gluon plasma. In these lectures some recent developments on formulating a quantum transport theory for quark-gluon plasmas are introduced. 46 refs.
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Upcoming heavy ion experiments at the AGS and SPS are aimed at producing and diagnosing a primordial form of matter, the quark-gluon plasma. In these lectures some recent developments on formulating a quantum transport theory for quark-gluon plasmas are i...
We construct a model for hadronization of the quark-gluon plasma, based on the relativistic coalescence model. We relate the coalescence amplitude to the one-particle Wigner function for quarks in the plasma. The relation between the Wigner function and t...
These lectures are intended to be an introduction to the physics of the quark-gluon plasma, and were presented at a workshop on The Physics of the Quark-Gluon Plasma held at Hua-Zhong Normal University in Wuhan, People's Republic of China in September, 19...
The dynamical instabilities, whose development can be expected under the hard jet propagating through the quark-gluon plasma, are analyzed. The possible signals of the quark-gluon plasma formation in ultrarelativistic nuclear collisions connected with the...
We propose to use as a signal of quark-gluon plasma formation the angular asymmetry in the separation of lepton pairs which are formed at the boundary of the plasma as a result of the interaction of the quarks with the collective color field which ensures their confinement.
The boundary of a quark-gluon plasma affects the momentum distribution of quarks in the plasma. In particular, a transverse boundary leads to a transverse momentum distribution with a shape different from the thermal distribution especially in the high transverse momentum region. In consequence, boundary effect ...
These lectures are a brief introduction to some of the weak coupling techniques used to decribe the physics of the quark-gluon plasma at high temperature.
A selection of results are discussed that support the conclusion that strongly interacting quark gluon plasma is produced in heavy-ion collisions at the Relativistic Heavy Ion Collider at BNL.
The authors present the equilibrium phase diagram for hadronic and quark matter containing strange particles and show quantitatively that at finite baryon density hadronization of quark-gluon plasma proceeds through a mixed phase in which s-bar-quarks hadronize first (as K/sup +/ and K/sup 0/ mesons) and ...
A high-temperature quark-gluon plasma is shown to have twice as many fermionic modes as at zero temperature. Besides propagating quarks and antiquarks there are also propagating quark holes and antiquark holes. The holes are generated dynamically (i.e., without any chemical potentials) and show many similarities to ...
We develop a new formulation of the quark coalescence model by including the quark number conservation in order to describe the hadronization of the bulk of the quark�gluon plasma. The scalings between hadron and quark phase space distributions are shown to depend on the transverse momentum. ...
NASA Astrophysics Data System (ADS)
Production of mesons from an equilibrated but rapidly hadronizing quark gluon plasma (QGP) is studied. The proposed model assumes the formation of hadrons such that the constituent quarks from the hadronizing QGP combine to form an on-shell particle. The ...
We consider the behavior of lattice models of quark confinement at high temperature. We find that confinement is strictly a low-temperature phenomenon. At high temperatures a transition to a plasma-like phase occurs. In this phase free gluons form a plasma which Debye screens the quarks.
The problem of a possibility of a quark-gluon plasma formation in relativistic heavy ion collisions is discussed. The estimates of the initial values of quark-gluon plasma parameters and their critical values corresponding to a phase transition into a had...
In this Letter we argue that the event-by-event fluctuations of the ratio of the positively charged and the negatively charged pions provide a signal for a quark-gluon plasma. The fact that quarks carry fractional charges is ultimately responsible for this distinct signal. PMID:10970466
Thermophoresis in the Quark�Gluon Plasma The quark�gluon plasma (QGP) is a new state of matter, con Bang. Presently, a search for the QGP in relativistic nucleus� nucleus (or heavy�ion) collisions, where with this programme is the identification of the QGP phase which exists in these nuclear reactions only ...
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Recent experiments at RHIC and theoretical considerations indicate that the quark-gluon plasma, present in the fireball of relativistic heavy-ion collisions, might be in a liquid phase. The liquid state can be identified by characteristic correlation and structure functions. Here definitions of the structure functions and pair correlations of the ...
We reinvestigate the probability distribution of jet acoplanarity as a tool to search for quark-gluon-plasma formation in nuclear collisions. We find serious hadronic background effects from the surrounding nuclear matter in nuclear collisions, which severely limit the usefulness of jet acoplanarity as a quark-gluon-plasma probe. Only if ...
in a Quark�Gluon Plasma Sidi Cherkawi Benzahra 1 School of Physics and Astronomy University of Minnesota potential, in a quark�gluon plasma. Since mesons are no longer bound in the quark�gloun plasma, there might can dissociate into other elements. The medium, the ...
The quark-gluon plasma, possibly created in ultrarelativistic heavy-ion collisions, is a strongly interacting many-body parton system. By comparison with strongly coupled electromagnetic plasmas (classical and non-relativistic) it is concluded that the quark-gluon plasma could be in the liquid ...
The basic assumptions of the quark-hadron matter theory are formulated in detail. The theory includes into consideration all possible phase states of quarks: the quark-gluon plasma or the phase of free quarks, and the states from n-quark clusters where n=...
We measure the response of the quark number to an infinitesimal chemical potential in high-temperature QCD with two light flavors of dynamical fermions. In the chirally symmetric phase the susceptibilities for quark number density and for the density of the third component of isospin are large and equal within statistics, which is consistent with a ...
The collisional energy gain of a heavy quark due to chromoelectromagnetic field fluctuations in a quark-gluon plasma is investigated. The field fluctuations lead to an energy gain of the quark for all velocities. The net effect is a reduction of the collisional energy loss by 15-40% for parameters relevant at RHIC ...
We investigate the dissociation of a heavy meson in the medium composed of light quarks and gluons. In the quark-gluon plasma, the dissociation length of the heavy meson becomes short as the temperature or quark chemical potential increases. On the contrary, in the hadronic phase the dissociation length becomes ...
The quark-gluon plasma is a novel state of matter in which quarks are no longer confined to bound states such as baryons and mesons. Just after the Big Bang the Universe was filled with a quark-gluon plasma. The cores of neutron stars may well be a quark-gluon ...
Berkeley Lab scientists and their colleagues map phase changes in the quark-gluon plasma IMAGE: An ordinary proton or neutron (foreground) is formed of three quarks bound...
Science.gov Websites
After a brief and subjective evaluation of some talks of this School dealing with the high temperature phase of QCD a mechanism for quark confinement is presented. 18 refs., 5 figs.
may finally resolve ? Unknown composition. Where ? could be: hyperon condensate, pion condensate, kaon condensate, strange quark matter, quark-gluon plasma& ...
hyperons, quarks, other exotica . " High mass limit sets highest possible density achievable in .... Pions, kaons, hyperons, quark-gluon plasma? ...
Big Bang Nucleosynthesis and the Cosmic Quarks-Hadron Phase. Transiton. Hadron. Phase p,n,?, .. Quark-Gluon Plasma. This leads to an inhomogeneous universe ...
Vol. 29 (1998) ACTA PHYSICA POLONICA B No 12 QUARK�GLUON PLASMA Stanislaw Mr�wczyski Soltan introduction to the physics of quark�gluon plasma is given. We start with a sketchy presentation of the Quantum up of quarks and gluons is briefly discussed with a special emphasis on the ...
The one- and two-particle inclusive spectra of photons emitted by a hot, optically transparent quark-gluon plasma are calculated. It is shown that photon interferometry is an efficient tool both for finding the plasma itself, and for finding the hydrodynamical stage of its evolution.
I review new theoretical results concerning the QCD equation of state and the formation of a dense parton plasma in high energy collisions of nuclei. I also survey experimental signatures of a quark-gluon plasma in the light of present and future experiments.
The author reviews recent experimental results in the search for the quark-gluon plasma. Because the magnitudes of many signals for the plasma are directly proportional to the reaction cross sections, the author examines the corrections to the commonly us...
Meson formation and radiation at the surface of quark-gluon plasma are studied by making use of the chromoelectric flux tube model. The effect of the surface meson radiation on the hydroexpansion of the plasma fluid is also discussed.
Meson formation and radiation at the surface of quark-gluon plasma are studied by making use of the chromoelectric flux tube model. The effect of the surface meson radiation on the hydroexpansion of the plasma fluid is also discussed. (ERA citation 09:011...
The main arguments leading to the conclusion that a quark-gluon plasma could be formed in ultrarelativistic heavy-ion collisions are reviewed. The evolution of a plasma formed in a central collision is described using a simple hydrodynamical model. (ERA c...
The filamentation instability of the quark-gluon plasma (QGP) caused by the hard jet of colored partons propagating through QGP is considered. The analysis is carried out with the successive account of plasma dispersion characteristics related to the expe...
The basic questions to be addressed in this paper are: How does the quark-gluon plasma, once formed in heavy-ion collisions, approach equilibrium. What are the basic equilibrium time scales - how do they compare with the plasma lifetime before hadronizati...
We present here a brief summary of the presentation given at the Quark-Gluon-Plasma Thermalization Workshop in Vienna, Austria in August 2005, directly following the International Quark Matter Conference in Hungary.
We propose a model for the propagation of a heavy quark in a hot plasma, to be viewed as a first step towards a full description of the dynamics of heavy quark systems in a quark-gluon plasma, including bound state formation. The heavy quark is treated as a non-relativistic ...
The production of high baryon density plasmas at 10 GeV/A and low baryon density plasmas at 1 TeV/A via nuclear collisions is discussed.
Elastic scattering of charm (c) and bottom (b) quarks via D- and B-meson resonance states in an expanding, strongly interacting quark-gluon plasma is investigated. Drag and diffusion coefficients are calculated from an effective model based on chiral symmetry and heavy-quark effective theory, and utilized in a ...
Recently, it has been demonstrated that the chemical composition of jets in heavy ion collisions is significantly altered compared to the jets in the vacuum. This signal can be used to probe the medium formed in nuclear collisions. In this study we investigate the possibility that fast light quarks and gluons can convert to heavy quarks when passing ...
We discuss quark antiquark energies and the screening mass in hot QCD using the non-perturbative lattice approach. For this purpose we analyze properties of quark antiquark energies and entropies at infinitely large separation of the quark antiquark pair ...
The heavy quarks are the interesting probes of hot matter created inrelativistic heavy ion collisions. We describe the Brownian motion of heavy quarks in the hot medium by the relativistic Langevin equation. The numerical simulation of heavy quarks in the expanding fireball and its comparison to experimental data indicates that the ...
Finite temperature modifies the running of the QCD coupling {alpha}{sub s}(k,T) with resolution k. After calculating the thermal quark and gluon masses self-consistently, we determine the quark-quark and quark-gluon cross sections in the plasma based on the running coupling. We find that the running coupling ...
The author reviews recent experimental results in the search for the quark-gluon plasma. Because the magnitudes of many signals for the plasma are directly proportional to the reaction cross sections, the author examines the corrections to the commonly used lowest-order cross sections. The author finds that the corrections are often ...
The jet quenching parameter q? is analyzed for a quark jet propagating in an anisotropic plasma. The momentum anisotropy is calculated at high temperature of the underlying quark-gluon plasma. q? is explicitly estimated in leading-logarithmic approximation by the broadening of the massless ...
We consider the evolution of the phase transition of the quark-gluon plasma into hadrons, assuming that the phase transition proceeds by means of evaporation of hadrons from the surface of a plasma drop. It is shown that the chemical composition of the quark-gluon plasma changes during the ...
of state for superdense matter with a quark phase transition is derived on the basis of the three equations quark plasma state. A phase transition to so�called strange quark matter in a superdense nuclear plasma of a mixed phase of quark and nuclear matter may turn out to ...
The transition from nuclear matter to quark matter in shock fronts is discussed. The relativistic shock equations are considered and applied to quark-matter production in dependence on the bag constant. The problem of shock splitting is discussed as a possible signature of the phase transition. One-dimensional hydrodynamical calculations for a two-phase ...
in quark gluon plasma (QGP), astrophysics, Bose-Einstein condensation (BEC) etc. Detailed study of QGP of state (EoS) of QGP is used to study compact stars like quark star. PACS Nos : 05.30.-d, 12.38.Mh, 12 gluon plasma, quark star 0 #12; 1 Introduction : There are many systems like QGP, ...
We review progress in our understanding the production and time evolution of the quark gluon plasma starting with boost invariant initial conditions in a filed theory model based on the Schwinger mechanism of particle production via tunneling.
Two decades ago Matsui and Satz suggested that Debye screening in the quark-gluon plasma would result in J/psi suppression in heavy ion collisions. Much has happened in the subsequent years, and the picture of quark-gluon plasma at present is rapidly evol...
Current status of experimental results on strange particle production in relativistic nucleus-nucleus collisions is reviewed. Emphasis is placed on the relevance to the hypothetical quark-gluon plasma formation and the origin of the Universe.
Results from the NA35 experiment at the CERN SPS are described in the context of possible formation and identification of a quark-gluon plasma (QGP). Evidence is presented that the initial energy density and temperature are sufficient for the QGP to be pr...
Effects of expansion on the Debye length in quark-gluon plasma are calculated in an abelian, boost invariant model. It is found that for early times the screening is significantly more efficient than what follows from naive static considerations. 11 refs....
There is a fugitive on the loose. Its name is Quark-Glluon Plasma, alias the QGP. The QGP is a known informant with knowledge about the fundamental building blocks of nature that we wish to extract. This briefing will outline the status of the pursuit of ...
Selected recent data from ion collisions at high energy are discussed in the frame-work of Quark-Gluon Plasma (QGP) searches. The purpose of these experiments is to measure the volume where a high temperature QGP may have been formed, determine its charac...
Photon production in a longitudinally and transversely expanding gluon plasma with initially little quark admixture is considered. Chemical equilibration of quarks and gluons is followed by rate equations. The yields of hard photons with E (>=) 2 GeV are ...
The quark-antiquark plasma near equilibrium is studied. The results are based on the Heinz kinetic equations with the Boltzmann collision operator approximated by a relaxation term with the relaxation time, tau, treated as a small parameter. Linear in tau...
The relative multiplicity abundance K/sup +//..pi../sup +/ and K/sup +//p/sup +/ arising in quark-gluon plasma formed in high energy nuclear collisions is determined. It is shown how these ratios assist in discriminating between various reaction channels.
We discuss the radiative corrections to the production of lepton pairs in a quark-gluon plasma at finite temperature. The real-time formalism is used throughout the calculations. We show that both infrared and mass singularities cancel in the final result...
In the search for the quark-gluon plasma, it has been suggested that the production of charmonium will be suppressed in a quark-gluon plasma because of the screening of the interaction between c and (anti c). To extract information on the suppression due ...
We follow the hydrodynamical evolution of hadronic matter in relativistic nuclear collisions in order to study hadronic signals for quark gluon plasma formation. In particular, we present nonequilibrium calculations for hadronisation and evolution of stra...
Differential rate of gluon emission from the quark gluon plasma is calculated within a framework of perturbative QCD. The rate is found to be four order of magnetic greater then the corresponding rate for direct thermal photons at any frequencies and temp...
We discuss the free energy of spherical bubbles of hadronic (quark-gluon plasma) matter in metastable equilibrium in a quark-gluon plasma (hadronic matter) at a fixed temperature [ital T][lt][ital T][sub [ital c
We consider the hydrodynamic evolution of a hot droplet of quark-gluon plasma, taking the emission of hadrons from the surface of the droplet into account. The emission rates are estimated using detailed balance arguments for an evaporation process. We fi...
The chromoelectric flux tube model is used to obtain a dynamical description of the evaporation of mesons from a quark-gluon plasma. The radiation pressure is computed to assess whether this process is an important mode for the disassembly of a compressed...
A hydrodynamical model is used to describe the expansion of a quark-gluon plasma formed in the central rapidity region of a central heavy ion collision. We show that the correlations between multiplicities and average transverse momenta provide some infor...
The screening properties of an abelian quark-gluon plasma and boost invariantly expanding in a given direction, are discussed. The expansion results in anisotropic screening. At early stages of the process, the Debye length along the direction of the expa...
Conditions are found for existence of stable shock waves in relativistic hydrodynamics. The stability criterion obtained is applied to analysis of the hadronization of quark-gluon plasma in the form of a rarefaction shock wave.
Using color kinetic theory, we discuss color conduction and color response in a quark-gluon plasma. Collective color oscillations and their damping rates are investigated. An instability of the thermal equilibrium state in high T QCD is discovered.
We report on recent work which indicates that an enhancement of antibaryons produced in the hadronization phase transition can signal the existence of a transient quark-gluon plasma phase formed in a heavy-ion collision. The basis of the enhancement mecha...
Identifying reliable signatures of the Quark-Gluon Plasma formation in the ultra-relativistic heavy ion collisions will be the major goal of the future experiments at BNL (RHIC) and CERN (LHC). As these experiments are expected to give new dimensions to t...
The Fermilab Tevatron antiproton-proton collider will begin operation late 1986. A brief description of experiments with the capability for detecting the formation of quark-gluon plasma is presented.
Long time ago, photon production was proposed as a probe and a thermometer for Quark-Gluon Plasma (QGP). However, only recently has the complete ?s order photon spectrum been obtained. In this paper we give a brief review of the problematic as well as discuss the O(?) result.
It has recently been suggested that the quark-gluon plasma formed in heavy-ion collisions behaves as a nearly ideal fluid. That behavior may be understood if the quark and antiquark mean free paths are very small in the system, leading to a �sticky molasses� description of the plasma, as advocated by the Stony ...
An Overview of the status and results from the relativistic heavy ion program at the AGS and SPS; perspective for future colliders.
are exploring transition to quark-gluon plasma. " The high density low temperature regime is inaccessible to laboratory experiment. The ...
... perturbative method for studying few-body interactions in such quantum systems as the quark-gluon plasma. The classical results ...
DTIC Science & Technology
This report discusses a number of experiments in heavy ion collisions used to discover the quark-gluon plasma. (LSP)
We study the energy-momentum and baryonic number conservation laws for quark-gluon plasma discontinuity transitions into hadron matter states. We find that the time-like shock hadronization of a supercooled quark-gluon plasma (when the normal vector to th...
The quark-gluon-plasma-hadronization model is used to consider the production of mesons during NN-bar annihilation at rest. The calculated inclusive spectra and multiplicities of mesons are in reasonable agreement with experiment. The possibility of a ''threshold'' effect in the inclusive spectra due to the collective interaction between the ...
The screening potential of a parton moving through a quark-gluon plasma is calculated using semiclassical transport theory. An anisotropic potential showing a minimum in the direction of the parton velocity is found. As consequences possible new bound states in the quark-gluon plasma and J/{psi} dissociation are ...
Analysis of the contribution of instantons to the equation of state of a quark plasma leads to a conclusion concerning the existence of the plasma -- hadron gas phase transition of the first kind. Comparison of calculations with data on neutron star masses excludes the existence of multi-baryon hadrons composed of light ...
This book contains the proceedings of the 1988 International Conference on Physics and Astrophysics of Quark-Gluon Plasma. Included are the following articles: Current status of quark-gluon plasma physics, A chiral theory of nucleons and nuclear matter, Use of time projection chamber for measuring heavy ion ...
The Relativistic Heavy Ion Collider (RHIC), under construction at Brookhaven National Laboratory, will be the site of a series of experiments seeking to discover the quark-gluon plasma and elucidate its properties. Several observables should exhibit characteristic behaviors if a quark-gluon plasma is indeed created ...
We calculate the production of high-energy photons from Compton scattering and annihilation of a quark jet passing through a quark gluon plasma produced in a relativistic heavy ion collision. The contributions are large and reflect the momentum distribution of the jets and the initial conditions of the plasma. ...
The rate of quark-gluon plasma droplet nucleation in superheated hadronic matter is calculated within the MIT bag model. The requirements of color singletness and (to less extent) fixed momentum suppress the nucleation rate by many orders of magnitude, making thermal nucleation of quark-gluon plasma droplets ...
Charm production from the quark-gluon plasma created in the midrapidity of central heavy ion collisions at the Large Hadron Collider (LHC) is studied in the next-to-leading order in QCD. Using a schematic longitudinally boost-invariant and transversally expanding fire-cylinder model, we find that charm production could be appreciably enhanced at LHC as a ...
NCQ scaling of elliptic flow is studied in a non-equilibrium hadronization and freeze-out model from ideal, deconfined and chirally symmetric Quark Gluon Plasma (QGP), to final non-interacting hadrons. In this transition the quarks gain constituent quark mass while the background Bag-field breaks up. The ...
We discuss the production of strange quark clusters in high energy heavy ion reactions in which a Quark-Gluon-Plasma (QGP) intermediate state is excited. A microscopic fission-chain model (PHASER) has been constructed for the description of QGP rehadronization. Color fluctuations, Q�Q pair production and energy fragmentation have been taken into account. ...
An equation of state is computed for a plasma of one flavor quarks interacting through some phenomenological potential, at zero temperature. Assuming that the confining potential is scalar and color-independent, it is shown that the quarks undergo a first-order mass phase transition. In addition, due to the way screening is introduced, ...
Fluctuations of chromodynamic fields in the collisionless quark-gluon plasma are found as a solution of the initial value linearized problem. The plasma initial state is on average colorless, stationary, and homogeneous. When the state is stable, the initial fluctuations decay exponentially and in the long-time limit a stationary ...
Charm- and bottom-quark rescattering in a quark-gluon plasma (QGP) is investigated with the objective of assessing the approach toward thermalization. Employing a Fokker-Planck equation to approximate the collision integral of the Boltzmann equation we augment earlier studies based on perturbative parton cross sections by introducing ...
Production, elliptic flow and the nuclear modification factor of charm and bottom quarks are studied in central and non-central heavy-ion collisions at RHIC and LHC using the partonic transport model Boltzmann Approach of MultiParton Scatterings (BAMPS). Employing an initial heavy quark yield obtained with PYTHIA the full space-time evolution of charm and ...
The drag and diffusion coefficients of charm and bottom quarks propagating through quark gluon plasma (QGP) have been evaluated for conditions relevant to nuclear collisions at the Large Hadron Collider (LHC). The dead cone and Landau-Pomeronchuk-Migdal (LPM) effects on radiative energy loss of heavy quarks have ...
We report about a recent calculation of the heavy quarkonium mass and decay width in a quark-gluon plasma, whose temperature T and screening mass mD satisfy the hierarchy m?s>>>T>>>m?s2>>>mD, m being the heavy-quark mass, up to order m?s5. The calculation may be relevant to understand the behavior of the ...
The nuclear modification factor R of charm quarks produced from the initial fusion of nucleus nucleus collisions at RHIC and LHC energies is estimated. We consider the effect of energy loss of the charm quarks while passing through the Quark Gluon Plasma (QGP) and also the gluon shadowing effect for the calculation ...
Using the gauge-string duality, I compute two-point functions of the force acting on an external quark moving through a finite temperature bath of N=4 super-Yang-Mills theory. I comment on the possible relevance of the string theory calculations to heavy quarks propagating through a quark-gluon plasma.
Average energy loss of light quarks has been calculated in a two stage equilibrium scenario where the quarks are executing Brownian motion in a gluonic heat bath. The evolution of the quark pT spectra is studied by solving Fokker-Planck equation in an expanding plasma. Results are finally compared with ...
We analyze the spectral properties of the quark propagator above the critical temperature for the deconfinement phase transition in quenched lattice QCD using clover improved Wilson fermions. The bare quark mass dependence of the quark spectral function is analyzed by varying the hopping parameter {kappa} in Landau gauge. We assume a ...
The constituent quark number scaling of elliptic flow is studied in a non-equilibrium hadronization and freeze-out model with rapid dynamical transition from ideal, deconfined and chirally symmetric Quark Gluon Plasma, to final non-interacting hadrons. In this transition a Bag model of constituent quarks is ...
The constituent quark number scaling of elliptic flow is studied in a nonequilibrium hadronization and freeze-out model with rapid dynamical transition from ideal, deconfined, and chirally symmetric quark-gluon plasma, to final noninteracting hadrons. In this transition a bag model of constituent quarks is ...
We derive hydrodynamic-like equations that are applicable to short-time-scale color phenomena in the quark-gluon plasma. The equations are solved in the linear response approximation, and the gluon polarization tensor is derived. As an application, we study the collective modes in a two-stream system and find plasma instabilities when ...
Quark Gluon Plasma transport coefficients for heavy quarks and Q&Qmacr; pairs are computed through an extension of the results obtained for a hot QED plasma by describing the heavy-quark propagation in the eikonal approximation and by weighting the gauge-field configurations with the Hard ...
We study the properties of quark-antiquark interactions in the Quark-Gluon Plasma at moderate temperatures, T {approx_equal} 1-2 Tc, within a Brueckner-type many-body approach. The quark-antiquark T-matrix, including both color-singlet and -octet channels, and corresponding quark self-energies ...
Strangeness in the evolution of a quark-gluon plasma is considered. A phenomenological equation of state is used to describe the phase transition between a hot and dense hadron gas and a quark-gluon plasma. The consequences for the phase diagram of strangeness conservation during nuclear collisions are analyzed. ...
I outline some of the progress over the past few years in applying ideas from string theory to study the quark-gluon plasma, including the computation of the drag force on heavy quarks and estimates of total multiplicity from black hole formation. I also indicate some of the main perils of the string theory approach.
We show that a heavy quark moving sufficiently fast through a quark-gluon plasma may lose energy by Cherenkov-radiating mesons. We demonstrate that this takes place in all strongly coupled, large-N{c} plasmas with a gravity dual. The energy loss is exactly calculable in these models despite being an O(1/N{c}) ...
We show that a heavy quark moving sufficiently fast through a quark-gluon plasma may lose energy by Cherenkov-radiating mesons. We demonstrate that this takes place in all strongly coupled, large-N{sub c} plasmas with a gravity dual. The energy loss is exactly calculable in these models despite being an O(1/N{sub ...
The author discusses the applicability of a hydrodynamic description of high energy hadronic collisions. The author reviews the results of recent computations of the mean free paths of quarks and gluons in a quark-gluon plasma, and the corresponding results for viscous coefficients. These quantities are employed to evaluate the limits ...
The initial (linear) stage of filamentary instability (the Weibel instability) which in the system of two-counter quark fluxes develops faster than others has been considered in terms of the non-Abelian Vlasov-Yang-Mills equations for quark plasma in a me...
Experimental results of RHIC in its first decade firmly established that hot and dense partonic matter, a quark gluon plasma (QGP), is formed in heavy ion collisions at RHIC. Contrary to early expectation, the QGP formed at RHIC is not a weakly-coupled gas of quarks and gluons, but instead appears to be a strongly-coupled fluid with ...
It has recently been suggested that the production of charmonium in ultrarelativistic heavy-ion collisions should be suppressed if quark-gluon plasma is formed because of color screening of the quark-antiquark potential. A reconsideration of the time scales involved, and of the mechanisms for producing charm in hadron-hadron ...
In this Letter we argue that the event-by-event fluctuations of the ratio of the positively charged and the negatively charged pions provide a signal for a quark-gluon plasma. The fact that quarks carry fractional charges is ultimately responsible for this distinct signal. (c) 2000 The American Physical Society.
Starting from a classical kinetic description of the quark-gluon plasma, we derive in the linear response approximation the color response function near thermodynamic equilibrium. From its poles the dispersion relations for the collective color modes (one longitudinal and one transverse) are obtained. The absence of Landau damping in the ...
In the deconfinement phase of QCD, quarks and gluons interact with the dense stochastic color-magnetic vacuum. We consider the dynamics of quarks in this deconfinement phase using the field correlators method and derive an effective nonperturbative interquark potential, in addition to the usual perturbative short-range interaction. We find the resulting ...
We calculate the equation of state of a quark system interacting through a phenomenological potential, the Richardson�s potential, at finite baryon density and zero temperature. In particular we study three different cases with different quark masses ( u and d ), and different assumptions for the potential at large distances. We solve molecular ...
An equation of state is computed for a plasma of one flavor quarks interacting through some phenomenological potential, in the Hartree approximation, at zero temperature. Assuming that the confining potential is scalar and color-independent, it is shown t...
The existence of a deconfined phase of quarks and gluons (QGP) is a prediction of QCD and has been the matter of an active research for the past eight years. At the end of 1994, Pb beams at 158 GeV/nucleon will be available at CERN. The production of vect...
This paper briefly discusses the topics covered in the relativistic heavy ion sessions. The prime motivation for these investigations is the possibility of forming quark matter, therefore the formation of a quark-gluon plasma. Topics on suppression of J//...
I discuss recent progress in calculating quarkonia correlators and spectral functions on the lattice in relation with the problem of quarkonia dissolution at high temperatures and heavy quark transport in Quark Gluon Plasma.
Statistical QCD predicts that with increasing density, strongly interacting matter will undergo a transition to a plasma of deconfined quarks and gluons. High energy heavy ion collisions are expected to permit experimental studies of this transition and of the predicted new state of matter. 22 refs., 6 figs.
The degree of polarization of magnetic bremsstrahlung radiation resulting from the interaction of escaping quarks with a collective confining color field is calculated. For a wide rapidity interval the angle at which the photon is registered and constitut...
Conditions favorable to formation and observation of a deconfined state of quarks and gluons (often called the quark-gluon plasma) are thought to exist following the collision of very heavy nuclei at center-of-mass energies exceeding several tens of GeV/n...
A phenomenological approach to confinement in a quark-gluonplasma is developed and studied. Asymptotic freedom appears to be reached at much higher densities than assumed so far, proving that the characteristics of the phase transition depend sensitively on the form of the confinement mechanism.
The universal motivation for colliding large nuclei at relativistic energies is the expectation that a small volume of the primordial quark soup, generally referred to as the Quark-Gluon Plasma (QGP), can be created and studied. The QGP is formed via a ph...
The jet quenching parameter q is analyzed for a quark jet propagating in an anisotropic plasma. The momentum anisotropy is calculated at high temperature of the underlying quark-gluon plasma. q is explicitly estimated in leading-logarithmic approximation by the broadening of the massless quark ...
We argue that an expanding quark-gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated color fields. We derive an expression for the anomalous viscosity in the turbulent plasma domain and apply it to the hydrodynamic expansion phase, when the quark-gluon ...
By colliding ultrarelativistic ions, one achieves energy densities close to the critical value for the formation of a quark-gluon plasma. We introduce a percolation approach to model the final stage (?>1 fm/c) of ion-ion collisions, the initial stage being treated by well-established methods, based on strings and Pomerons. The percolation approach ...
An equation of state is computed for a plasma of one flavor quarks interacting through some phenomenological potential, in the Hartree approximation, at zero temperature. Assuming that the confining potential is scalar and color-independent, it is shown that the quarks undergo a first-order mass phase transition. In addition, due to ...
We analyze the baryon-number density contrast R between the quark-gluon-plasma (QGP) phase and the hadronic phase during a first-order quark-hadron phase transition in the early Universe. Without the inclusion of baryonic resonances in the hadronic phase, we can reduce R by including interactions between quarks and gluons in the QGP ...
We demonstrate that a Quark-Gluon Plasma (QGP) with a dilute admixture of heavy quarks has, in general, a lower speed of sound than a �pure� QGP without effects from heavy flavors. The change in the speed of sound is sensitive to the details of the theory, making the hydrodynamic response to �flavoring� a sensitive probe of the ...
In this study, quark and strange quark matter which exist in the first seconds of the early Universe have been studied in the context of general relativity to be able to obtain space-time geometry of first seconds of the early Universe. For this purpose, Einstein's field equations for quark and strange quark matter ...
Production and space-time evolution of heavy quarks in central and non-central heavy-ion collisions at RHIC and LHC are studied with the partonic transport model Boltzmann Approach of MultiParton Scatterings (BAMPS). In addition to the initially created heavy quarks in hard parton scatterings during nucleon-nucleon collisions, secondary heavy ...
One of the most promising probes to study deconfined matter created in high energy nuclear collisions is the energy loss of (heavy) quarks. It has been shown in experiments at the Relativistic Heavy Ion Collider that even charm and bottom quarks, despite their high mass, experience a remarkable medium suppression in the quark gluon ...
The kinetic properties of relativistic quark-gluon and electron-photon plasmas are described in the weak coupling limit. The troublesome Rutherford divergence at small scattering angles is screened by Debye screening for the longitudinal or electric part of the interactions. The transverse or magnetic part of the interactions is effectively screened by ...
These lectures are intended to be an introduction to the physics of the quark-gluon plasma, and were presented at a workshop on The Physics of the Quark-Gluon Plasma held at Hua-Zhong Normal University in Wuhan, People's Republic of China in September, 1983. The lectures cover perturbation theory of the ...
We propose the enhancement of {lambda}{sub c} as a novel quark-gluon plasma signal in heavy ion collisions at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider. Assuming a stable bound diquark state in the strongly coupled quark-gluon plasma near the critical temperature, we argue that the ...
Using the recently published model [Gossiaux and Aichelin, Phys. Rev. C 78, 014904 (2008)] for the collisional energy loss of heavy quarks in a quark gluon plasma (QGP), based on perturbative QCD (pQCD) with a running coupling constant, we study the interaction between heavy quarks and plasma ...
We show that in heavy ion collisions at LHC there could be a measurable production of baryons containing two or three heavy quarks from statistical coalescence. This production mechanism is peculiar of Quark Gluon Plasma and the predicted rates, in heavy ion collisions at LHC energy, exceed those from a purely hadronic scenario, ...
It is argued that in heavy ion collisions at the CERN Large Hadron Collider (LHC) there could be a sizable production of baryons containing two or three heavy quarks from statistical coalescence. This production mechanism is peculiar of quark gluon plasma, and the predicted rates, in heavy ion collisions at LHC energies, exceed those ...
We propose the enhancement of Lambdac as a novel quark-gluon plasma signal in heavy ion collisions at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider. Assuming a stable bound diquark state in the strongly coupled quark-gluon plasma near the critical temperature, we argue that the direct ...
As a new and clean probe to the strongly interacting quark-gluon plasma (sQGP), we propose an azimuthal correlation of an electron and a muon that originate from the semileptonic decay of charm and bottom quarks. By solving the Langevin equation for the heavy quarks under the hydrodynamic evolution of the hot ...
It is argued that strong dynamics in the quark-gluon plasma and bound states of quarks and gluons is mostly due to nonperturbative effects described by field correlators. The emphasis in the paper is made on two explicit calculations of these effects from first principles-one analytic using gluelump Green's functions and ...
The production of high baryon density plasmas at 10 GeV/A and low baryon density plasmas at 1 TeV/A via nuclear collisions is discussed. (ERA citation 08:055152)
We consider nonequilibrium phase transitions of a quark-gluon plasma into hadrons proceeding via supersonic condensation and detonation. We investigate the conditions for the realization of such transitions from the point of view of the second law of thermodynamics. We study the dynamics of the formation of a supercooled plasma and ...
It is demonstrated that the ?0/? ratio can never be a definite signal of the quark-gluon plasma but may be a rather useful diagnostic of the plasma only if measured in combination with dileptons in the kinematic regime pT~=2-4 GeV/c.
A space-time picture of the fragmentation and central regions is presented for extremely high energy head-on heavy nucleus collisions. The energy densities of the matter produced in such collisions are estimated. Speculations concerning the possible formation of a quark-gluon plasma are discussed, as are possible experimental signals for analyzing such a ...
The chromoelectric flux tube model is used to obtain a dynamical description of the evaporation of mesons from a quark-gluon plasma. The radiation pressure is computed to assess whether this process is an important mode for the disassembly of a compressed plasma. A new result for the creation rate of q anti q pairs in a constant color ...
Global characteristics of heavy ion collisions at high energy are now understood at some level such that the challenging search for Quark-Gluon plasma signatures becomes of more importance. Some features of pp, pA, and ..cap alpha../ alpha/ interactions at ..sqrt..s less than or equal to 62 GeV are selected to illustrate potential consequences for, and ...
In high-energy nuclear collisions, the new phase of the quark-gluon plasma is indicated by an anomalous increase in pressure, an excess of direct photon production, an excess of strangeness production, and an anomalous J/{psi} suppression. We review these signatures and discuss how recent high-energy heavy-ion experiments at CERN are consistent with the ...
The author studies the quark-gluon plasma using linear response theory. He finds different characteristics for different kinematical regions. For low k, k/sub 0/ (and K k/sub 0/ he finds energy absorbing and emitting processes. And for high k/T, when k < K/sub 0/ the author finds the vacuum to have an amplifying behavior; he relates this to an ...
We elaborate upon phenomenological models of high-temperature hadronic matter at zero baryon density. We discuss the choice of a practical set of ''fundamental'' degrees of freedom, indicate their relationship to dynamically confined plasma modes, and suggest in what way they may account for the phase transition and other thermodynamic ...
The transport interaction rates of elastic scattering processes of thermal partons in the quark-gluon plasma are calculated beyond the leading logarithm approximation using the effective perturbation theory for QCD at finite temperatures developed by Braaten and Pisarski. The results for the ordinary and transport interaction rates obtained from the ...
We study thermal corrections to the dispersion relations of massive fundamental particles immersed in weakly coupled non-Abelian plasmas. The cases covered include quarks in the QCD (quark-gluon) plasma, as well as Script N = 2 quarks and scalars in an Script N = 4 Super Yang-Mills ...
The rates governing momentum broadening in a quark-gluon plasma with a momentum anisotropy are calculated to leading-log order for a heavy quark using kinetic theory. It is shown how the problematic singularity for these rates at leading order is lifted by next-to-leading-order gluon self-energy corrections to give a finite ...
We compute the penetration depth of a light quark moving through a large N{sub c}, strongly coupled N=4 supersymmetric Yang-Mills plasma using gauge/gravity duality and a combination of analytic and numerical techniques. We find that the maximum distance a quark with energy E can travel through a plasma is given by ...
We estimate the probability that a hard nucleon-nucleon collision is able to nucleate a seed of quark-gluon plasma in the surrounding hot and dense hadronic matter formed during a central collision of two large nuclei at AGS energies. The probability of producing at least one such seed is on the order of 1--100 %. We investigate the influence of ...
q is the average squared transverse momentum transfer per unit length to a high-energy particle traversing a QCD medium such as a quark-gluon plasma. We find the (UV-regulated) value of q to leading order in the weak coupling limit, {alpha}{sub s}(T)<<1. We then use this value to generalize previous analytic results on the gluon ...
We propose a unified space-time picture of baryon stopping and quark-gluon plasma creation in ultrarelativistic heavy-ion collisions. It is assumed that the highly Lorentz contracted nuclei are decelerated by the coherent color field which is formed between them after they pass through each other. This process continues until the field is neutralized by ...
I review results on the shift of the (rho) meson mass at nonzero temperature in a gauged linear sigma model, under the assumption of strict vector meson dominance.
... high-energy physics (effective theories of the strong interactions), astrophysics (compact stellar objects), the physics of quark-gluon plasmas ...
Energetic particle jets created in relativistic heavy-ion collisions might create detectable shock waves as they travel through the quark-gluon plasma.
calorimeter to capture jet-quenching, the newest way to look inside the quark-gluon plasma - the hot, dense state of matter that filled the earliest universe, which the Large...
This article describes the RHIC, Relativistic Heavy Ion Collider, which is used to collide nuclei of heavy elements. This forms a "quark-gluon plasma" that can then be studied. Images and links to research are provided.
NSDL National Science Digital Library
... Another connection can be found at the opposite, sub-nucleus scale, where a shock can be expected in the expanding quark plasma [37]; the ...
... to explore diverse fermionic systems, ranging from high temperature superconductors to nuclear matter, neutron stars, and quark-gluon plasmas. ...
... to explore diverse fermionic systems ranging from high temperature superconductors to nuclear matter neutron stars and quark-gluon plasmas. ...
... V.V. Kocharovsky, Vl.V. Kocharovsky (Institute of Applied Physics of the ... by a powerful pulse of neutrino emission from hot quark-gluon plasma formed ...
The impact of the transition from the quark-gluon plasma to the hadronic ... mation is widely used in various fields of statistical physics e.g. nucleation ...
... nuclear distances. Guide experiments to identify transition from quantum chromodynamics to quark-gluon plasma. Accelerator ...
to the physics of neutron stars, to inhomogeneous quark{gluon plasma, and also to buckyballs (carbon{60 molecules
This paper presents a personal account of the scientific and professional adventures of Bikash Sinha on the occasion of the celebration of his 60th birthday held in Calcutta on Feb 7, 2005.
Difficulties in the understanding of the yields of ultrarelativistic heavy ion collisions are discussed. Implication of partial restoration of chiral symmetry to the problem is then presented.
that the #7; is no longer bound in the singlet 1 sidi.benzahra@ndsu.nodak.edu 1 #12; state. In quark-gluon plasma the threshold
