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arXiv 0909.2957hep-ex
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HERA的多轻子和孤立轻子事件

Multi-Lepton and Isolated Lepton Events at HERA

David M. South

摘要:

使用HERA的H1和ZEUS探测器,使用1994-2007年期间收集的数据,测量了在ep碰撞中产生的含有孤立高能轻子(电子和μ子)的事件的产生。本文分析了具有多个带电轻子或具有一个带电轻子但缺少横动量的拓扑。H1和ZEUS的数据(对应于每次实验的积分亮度约为0.5 fb^-1)被合并到一个公共的相空间中。将观测到的事件产额与标准模型的预测进行比较。在一般情况下,发现一个很好的协议,其中的期望是占主导地位的光子-光子碰撞的多轻子拓扑结构和单W生产的情况下,与孤立的电子或μ子和失踪的横向动量的事件。观测到了具有大横动量的事件。测量了这些过程的总截面和微分截面。

英文摘要:

Measurements of the production of events containing isolated high energy leptons (electrons and muons) produced in ep collisions have been performed with the H1 and ZEUS detectors at HERA, using data collected in the period 1994-2007. Topologies with more than one charged lepton or with a charged lepton in coincidence with missing transverse momentum are analysed. The H1 and ZEUS data, corresponding to an integrated luminosity of about 0.5 fb^-1 per experiment, are combined in a common phase space. The observed event yields are compared to the predictions from the Standard Model. In general a good agreement is found, where the expectation is dominated by photon-photon collisions for the multi-lepton topologies and by single W production in the case of events with an isolated electron or muon and missing transverse momentum. Events with large transverse momentum are observed. Total and differential cross sections of these processes are measured.

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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