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arXiv 0906.1504hep-ex
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HERA高横动量下的多轻子产生

Multi-lepton production at high transverse momentum at HERA

ZEUS Collaboration

摘要:

利用HERA的ZEUS探测器在ep碰撞中收集的全部数据样本,对应于480 pb^{-1}的积分亮度,对包含两个或多个高横动量孤立轻子的事件进行了搜索。观测到的事件的数量进行了比较,从标准模型的预测,寻找可能的偏差,特别是对于多轻子事件的不变质量大于100 GeV。观察到与标准模型的良好一致性。在光子-光子碰撞控制的受限相空间中,测量了双轻子产生的全截面和微分截面。

英文摘要:

A search for events containing two or more high-transverse-momentum isolated leptons has been performed in ep collisions with the ZEUS detector at HERA using the full collected data sample, corresponding to an integrated luminosity of 480 pb^{-1}. The number of observed events has been compared with the prediction from the Standard Model, searching for possible deviations, especially for multi-lepton events with invariant mass larger than 100 GeV. Good agreement with the Standard Model has been observed. Total and differential cross sections for di-lepton production have been measured in a restricted phase space dominated by photon-photon collisions.

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