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arXiv 0904.3876hep-ex
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在HERA上寻找单顶夸克产生

Search for Single Top Quark Production at HERA

H1 Collaboration

摘要:

我们在HERA的H1实验收集的全ep数据样本中搜索了单个顶夸克的产生,对应的积分亮度为474 pb^-1。研究了顶夸克衰变为b夸克和W玻色子以及W玻色子的轻子或强子衰变。用多变量分析方法对顶夸克产生过程和标准模型背景过程进行了区分。在95%CL下,通过变味中性流过程σ(ep -> etX)的顶夸克产生截面的上限值小于0.25 pb。导出了反常耦合kappa_{tu gamma}的极限。

英文摘要:

A search for single top quark production is performed in the full ep data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb^-1. Decays of top quarks into a b quark and a W boson with subsequent leptonic or hadronic decay of the W are investigated. A multivariate analysis is performed to discriminate top quark production from Standard Model background processes. An upper limit on the top quark production cross section via flavour changing neutral current processes sigma (ep -> etX) < 0.25 pb is established at 95% CL. Limits on the anomalous coupling kappa_{tu gamma} are derived.

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