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arXiv 0704.0760hep-ex
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在CDF II上寻找衰变为光子的重、长寿命粒子

Search for Heavy, Long-Lived Particles that Decay to Photons at CDF II

A. Abulencia et al.

摘要:

我们提出了第一次寻找重,长寿命的粒子衰变到光子在强子对撞机。我们使用了由CDF II探测器拍摄的\sqrt{s} =1.96 TeV的p-pbar碰撞中的光子+喷流+缺失横向能量事件样本。基于光子到达探测器的时间来选择候选事件。使用碰撞数据的积分亮度为570 pb-1,我们观察到2个事件,与背景估计的1.3+-0.7事件一致。虽然我们的搜索策略不依赖于模型特定的动力学,但我们在具有\tilde χ_1^0->γ \gravitino的超对称模型中设置横截面限制,并将世界上最好的95% C. L.在τ_{ \tilde χ_1^0} = 5 ns时,\tilde χ_1^0的质量下限为101 GeV/c^2。

英文摘要:

We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of photon+jet+missing transverse energy events in p-pbar collisions at \sqrt{s}=1.96 TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570 pb-1 of collision data, we observe 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 in a supersymmetric model with \tildeχ_1^0->γ\gravitino and place the world-best 95% C.L. lower limit on the \tildeχ_1^0 mass of 101 GeV/c^2 at τ_{\tildeχ_1^0} = 5 ns.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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