期刊
PHYSICAL REVIEW D
卷 78, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.032015
关键词
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资金
- STFC [PP/E002722/1, ST/G502412/1, PP/E000452/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G502412/1, PP/E000444/1, PPA/A/S/2003/00461/2, PP/E000452/1, PP/E002722/1] Funding Source: researchfish
We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via chi(0)(1)->gamma G in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 +/- 34 pb(-1) of p (p) over bar collisions at root s=1.96 TeV, we select 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 +/- 0.7 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 chi(0)(1) mass of 101 GeV/c(2) at tau(0)(chi 1)=5 ns.
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