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arXiv 0907.1048hep-ex
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在sqrt(s)=1.96 TeV的p-pbar碰撞中寻找第一代细夸克对的产生

Search for pair production of first-generation leptoquarks in p pbar collisions at sqrt(s)=1.96 TeV

The D0 Collaboration, V. Abazov

摘要:

本文利用费米实验室Tevatron对撞机D 0实验在sqrt(s)= 1.96TeV的p-pbar碰撞中获得的数据,对第一代leptoquark LQ的对产生进行了研究。在对应于~ 1fb-1的数据样本中,对具有两个电子和两个喷注或一个电子,两个喷注和缺少横向能量的末态进行了搜索。我们发现我们的数据与标准模型的预期一致。结果与那些在以前的分析中发现的事件与两个射流和失踪的横向能量,以获得标量LQ质量限制。我们设定了95%的C. L。对于β =1、β =0.5和β =0.02,标量LQ质量的下限分别为299 GeV、284 GeV和216 GeV,其中β是eq通道中的LQ分支比。这改善了Tevatron运行II中使用较低光度样品获得的结果。在β =0.5的情况下,具有从357 GeV到464 GeV的不同耦合的矢量LQ质量的下限也使用该分析来设定。

英文摘要:

A search for pair production of first-generation leptoquarks LQ is performed with data collected by the D0 experiment in p pbar collisions at sqrt(s)=1.96 TeV at the Fermilab Tevatron Collider. In a sample of data corresponding to ~1 fb-1, the search has been performed on the final states with two electrons and two jets or one electron, two jets and missing transverse energy. We find our data consistent with standard model expectations. The results are combined with those found in a previous analysis of events with two jets and missing transverse energy to obtain scalar LQ mass limits. We set 95% C.L. lower limits on a scalar LQ mass of 299 GeV, 284 GeV and 216 GeV for beta=1, beta=0.5 and beta=0.02 respectively, where beta is the LQ branching ratio in the eq channel. This improves the results obtained with a lower luminosity sample from Run II of the Tevatron. Lower limits on vector LQ masses with different couplings from 357 GeV to 464 GeV for beta=0.5 are also set using this analysis.

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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