Neutrino Factory Physics Study Meeting Minutes Tuesday, 12 October, 1999 Scribes: Steve, Debbie, Stephen, Eric 1. Video link: In principle 8 different groups connected via video. However the performance of the link this week was bad. At any one time I think we only had at most half the groups connected. Apologies to all those who suffered. 2. Working group organization Heidi/Steve 2.1 Working groups Five sub-groups have been defined, together with contact people: Group 1: Beam properties Heidi/Steve Group 2: Detector parameters Bob Bernstein (rhbob@fnal.gov) Group 3: Oscillation theory & Stephen Parke (parke@fnal.gov) Scenarios Group 4: Oscillation measurements Debbie Harris (debbie@hecate.fnal.gov) Group 5: Non-Oscillation measurements Eric Hawker (hawker@fnal.gov) Each group has a web page hanging off the main nu-factory physics study web site: http://www.fnal.gov/projects/muon_collider/nu/study/study.html 2.2 Email list There is a mail server. To contact people in the physics study group send email to nu-factory-study@fnal.gov This list is intended for the neutrino factory physics study. It is backed up to an archive and we plan to make that archive public when we figure out how to do so. We plan to use this list for announcements of meetings and results of work. The mailing list is open, anyone can subscribe to it by sending an email to mailserv@fnal.gov with the body SUBSCRIBE NU-FACTORY-STUDY person@address and you can get off by sending the body UNSUBSCRIBE NU-FACTORY-STUDY person@address 3. Group 1 report Steve Geer The main goal of the beam properties group is to write section 2 of the strawman table of contents. Three people (Steve Geer, Heidi Schellman, Ray Stefanski) expressed interest in this, and met last week to sketch out the contents of this section. The sketch for section 2 can be found on: http://www.fnal.gov/projects/muon_collider/nu/study/group1/group1.html and we all have sub-tasks, also listed. Our short-term goal is to produce a first (maybe not complete) draft in about 2 weeks. 4. Group 2 report Bob Bernstein The main immediate goal is to understand how the various experimental signatures map onto detector technologies, and then derive strawman detector parameters for the various oscillation and non-oscillation measurements. There is some concern about how to make a tau appearance measurement with a massive detector. It was said that emulsion enthusiasts were not optimistic about massive hybrid emulsion possibilities. 5. Group 3 report Stephen Parke Group 3 met last week, and with some difficulty, agreed on the first scenario that we should adopt: Scenario 1 i) LSND is ruled out by miniBoone. ii) The atmospheric is mu<->tau oscillation with maximal mixing. iii) Solar neutrino puzzle is Large Angle MSW. iv) Three active flavors (e, mu and tau) v) CP violation = zero (delta = 0) Using the parameterization of the PDG '98 eq 11.3 page 103 we have delta m_{32} = 3.5 x 10^{-3} eV^2 sin^2 2 theta_{23} = 1 this takes care of the atmospheric neutrinos, and delta m_{21} = 5 x 10^{-5} eV^2 sin^2 2 theta_{12} = 0.8 the Large mixing solution (MSW) for the solar neutrinos, and sin^2 2 theta_{31} = 0.04 so as to avoid being in contradiction to CHOOZ. We are promised at least one more point next time. A total of 5 - 10 points (scenarios) are expected to be defined in order to span the space of possibilities. 6. Group 4 report Debbie Harris The "oscillation measurements" that we would like to consider are the following: mapping out as much of the "neutrino CKM matrix" as possible (including CP violation), matter effects, and sterile neutrinos. Group 4 met on Friday Oct. 8 at 11AM in WH14x and immediately started thinking about oscillation measurements in the framework of what detectors one could build. We agreed to get simulations on our favorite detector contenders (or get the people using those simulations already to join our group) so we can see what physics signatures are accessible with what detectors, and whether or not these detectors might work at ground level. The detectors we are starting with are: 1. Steel/Scintillator Toroid Spectrometer (a la CCFR/NuTeV/MINOS) 2. "Kinematic Bubble Chamber" (a la ICARUS/CHORUS/NOMAD) 3. Cerenkov Detector (a la Kamiokande/Miniboone) We'd like to see which physics these detectors might measure for a variety of scenarios. There is also a dire need to understand and summarize what has already been discussed in the literature on the physics topics listed above, and we are hoping to work with theorists to find people to read through the most pertinent articles on these subjects and summarize them for the rest of us...so we know where we're starting! Meetings are proposed to be weekly on Fridays at 11AM in WH14X, if another time is suggested then we may move it--please send email to dharris@fnal.gov if you'd like to change the meeting time. Please also let debbie know if you'd like to be phoned for the meeting. 7. Group 5 report Eric Hawker The non-oscillation sub group of the neutrino factory study will be focusing on the following topics. People interested in working on each topic are also listed. -Electroweak measurements sin2thetaW measured in nu-e scattering (Schellman?) sin2thetaW measured in DIS scattering (Yu?) -Structure function measurements -High statistics measurements of F2 and F3 off of hydrogen and deuterium targets. -A-dependence of neutrino cross sections (Schellman?) Jorge Morfin has expressed interest in general QCD measurements -Heavy flavor physics and CKM matrix studies. This is a big interesting topic but we don't have anyone identified yet. -Spin Structure Functions (Velasco, Unel, Eichblatt have expressed interest) -Exotic particle/interaction searches - Fritz deJongh gave a nice discussion of these -R-parity violating SUSY search (looking for wrong sign muons). (deJongh and Stefanski?) -neutrino interactions with "large size" extra dimensions?? (a WIMP search?) (deJongh is already doing this) -Neutral Heavy Lepton searches -other topics? In addition to the above topics there are several topics which may, or may not, be included in the final report of the study group. However, we still wish to strongly encourage people to work on these topics, and we still would like to recruit people to work on these topics and others, even if they are not included in the final report. We see the studies of all of these topics possibly being published separately from the final report. In order to study these topics more efficiently a certain amount of "infrastructure" work should be done and quickly. Overview of cross sections and formulas (Schellman and Geer) neutrino cross section codes, (Harris) neutrino beam parameter codes (Geer) Most of the cross section and beam parameter information can be put into ntuples, which then can be easily distributed and used by the group.(Schellman and Harris are working on this) We also need to avoid reinventing the wheel. A thorough study of the existing literature, in particular CERN writeups and the Lyon talks. In addition, Bruce King is preparing a long Physics Report type document summarizing much of the physics listed here -several members of our study group are co-authors on this and it is expected to be available by the end of the year. We should use these resources where available. The next meeting for the non-oscillation sub-group will be on 10/19 at 11:30 CDT in Wilson Hall 12NW. Please look at the non-oscillation physics group web site for more information: http://www.fnal.gov/projects/muon_collider/nu/study/group5/group5.html 8. Goals for next time Group 1: Get close to a first (rough) draft of section 2. Group 2: Enumerate experimental signatures vs detector technologies. Group 3: Provide at least one more scenario. Identify people to understand/summarize the relevant part of the literature for CP-violation, matter effects, sterile neutrinos, ... prospects at a neutrino factory. Have a presentation on one of these sub-topics next time. Group 4: Have detector simulation results for the point in parameter space already specified (above). Group 5: Have the tools working to make detector simulation studies.