Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing

Collaboration
Apr, 2008
27 pages
Published in:
  • Phys.Rev.D 78 (2008) 032015
e-Print:
Report number:
  • FERMILAB-PUB-08-078-E
Experiments:

Citations per year

2008201220162020202402468101214
Abstract: (arXiv)
We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via lightest neutralino to gamma gravitino in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570±34pb1570\pm34 pb^{-1} of ppˉp\bar{p} collisions at s=1.96\sqrt{s}=1.96 TeV, we select γ\gamma+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of 1.3±\pm0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the neutralino mass of 101 GeV at lifetime = 5 ns.
Note:
  • Corrected author list
  • 13.85.Rm
  • 12.60.Jv
  • 14.80.Ly
  • 13.85.Qk
  • anti-p p: colliding beams
  • neutralino: hadroproduction
  • neutralino: radiative decay
  • neutralino: mass
  • gravitino
  • supersymmetry: symmetry breaking