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arXiv 0907.3627hep-ex
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HERA的高横动量多轻子

Multi-Leptons with High Transverse Momentum at HERA

The H1 Collaboration, the ZEUS Collaboration

摘要:

HERA的H1和ZEUS探测器研究了至少有两个高横动量轻子(电子或μ子)的事件,其积分亮度为0.94 fb^{-1}。观测到的事件数与标准模型的预测基本一致。在e^+p碰撞数据中观测到了7个双轻子和三轻子事件,轻子横动量标量和大于100 GeV,而预期的事件数为1.94 ± 0.17。在e^-p碰撞中没有观察到这样的事件,预测值为1.19 ± 0.12。总可见光和微分双电子和双μ子光生截面中提取的光子-光子碰撞占主导地位的限制相空间。

英文摘要:

Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb^{-1}. The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e^+p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94+-0.17 events are expected. Such events are not observed in e^-p collisions for which 1.19+-0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.

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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