A Search for Dimuon Resonances with CDF in Run II
 
Chris Hays(a), Ashutosh Kotwal(b), Ye Li(c), Oliver Stelzer-Chilton(d)
(a)University of Oxford, (b)Duke University, (c)University of Wisconsin, (d)TRIUMF


 
Inverse Invariant Mass Spectrum
  • Abstract
  • Measurement Technique
  • Mass Limits for Spin-1 Z' Models
  • Mass Limits for Spin-2 Graviton Models
  • Mass Limit Tables


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     Abstract

    We present a search for narrow dimuon resonances using 2.3/fb of data collected by the CDF II detector at Run II of the Fermilab Tevatron. No signal above the standard model expectation is observed in the dimuon invariant mass spectrum. We extract 95% CL upper limits on σ⋅Br(Z'→μμ) for heavy neutral Z' bosons and on σ⋅Br(G*→μμ) for heavy Kaluza-Klein gravitons in the Randall-Sundrum model.
     
     
     Measurement Technique

    At high mass, the observed width of the dimuon invariant mass distribution is dominated by the track curvature resolution, resulting in an approximately constant resolution in δ1/mμμ. Our search strategy is to construct templates of the inverse invariant mass distribution for a range of Z' boson pole masses, add the background distributions to the templates, and compare the templates to the 1/mμμ distribution from data in the search region 1/mμμ < 10 1/TeV. The simulated templates (including backgrounds) are normalized to the data in the 70 GeV < mμμ < 100 GeV normalization region. We evaluate the binned Poisson likelihood as a function of signal template integral. The likelihood yields the best-fit number of signal events observed, as well as the confidence interval.

     
     
     Mass Limits for Spin-1 Z' Models

    • Z' mass limits vs inverse invariant mass: (eps) (gif)
    • Z' mass limits vs inverse invariant mass (zoomed): (eps) (gif)
    • Z' mass limits vs invariant mass: (eps) (gif)

     
     
     Mass Limits for Spin-2 Graviton Models

    • Graviton mass limits vs inverse invariant mass: (eps) (gif)
    • Graviton mass limits vs invariant mass: (eps) (gif)
     
     
     Mass Limit Tables

    Z' Mass Limits

    Graviton Mass Limits