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arXiv 0706.4448hep-ex
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寻找sqrt(s)= 1.96 TeV的p-pbar碰撞中多轻子事件的反常产生

Search for Anomalous Production of Multilepton Events in p-pbar Collisions at sqrt(s) = 1.96 TeV

CDF Collaboration, A. Abulencia

摘要:

我们利用费米实验室Tevatron的CDF II探测器收集的对应于积分亮度为346 pb^{-1}的数据样本,对sqrt{s} = 1.96 TeV的p-pbar碰撞中多重带电轻子事件的异常产生进行了研究。搜索分为三轻子和四轻子或更多轻子数据样本。我们在三轻子样本中观察到六个事件,在>=4轻子样本中观察到零个事件。两个事件数量均与标准模型背景预期一致。在一个R宇称违反超引力模型的框架内,结果被解释为最轻的中性伴子和电荷伴子粒子的质量极限。对于一个特定的模型参数选择,在95%的置信水平下,极限是M_neutralino > 110 GeV/c^{2}和M_chargino > 203 GeV/c^{2};这些质量极限随模型参数的变化。

英文摘要:

We report a search for the anomalous production of events with multiple charged leptons in p-pbar collisions at sqrt{s} = 1.96 TeV using a data sample corresponding to an integrated luminosity of 346 pb^{-1} collected by the CDF II detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. We observe six events in the three-lepton sample and zero events in the >=4-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an R-parity violating supergravity model, the results are interpreted as mass limits on the lightest neutralino and chargino particles. For one particular choice of model parameters, the limits are M_neutralino > 110 GeV/c^{2} and M_chargino > 203 GeV/c^{2} at 95% confidence level; the variation of these mass limits with model parameters is presented.

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