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arXiv 1006.3575hep-ex
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利用2.3 fb^-1的ppbar碰撞在单顶夸克产生中通过夸克-胶子耦合寻找变味中性流

Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions

D0 Collaboration, V. Abazov

摘要:

我们在费米实验室Tevatron对撞机D 0探测器收集的单个顶夸克末态样本中,通过夸克-胶子耦合寻找味道改变的中性流,该样本对应于2.3 fb^-1的积分亮度。我们选择事件包含一个顶夸克的候选者与一个额外的喷流,并获得信号和背景之间的分离,使用贝叶斯神经网络。我们发现背景预期和观测数据之间的一致性,并设定了顶夸克与上夸克(tgu)和粲夸克(tgc)的味道变化中性流胶子耦合的限制。95% C. L.处的截面限值。sigma_tgu<0.20pb和sigma_tgc<0.27pb。这与顶夸克衰变分支分数的极限值B(t->gu)<2.0*10^-4和B(t->gc)<3.9*10^-3相对应。

英文摘要:

We present a search for flavor changing neutral currents via quark-gluon couplings in a sample of single top quark final states corresponding to 2.3 fb^-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. We select events containing a single top quark candidates with an additional jet, and obtain separation between signal and background using Bayesian neural networks. We find consistency between background expectation and observed data, and set limits on flavor changing neutral current gluon couplings of the top quark to up quarks (tgu) and charm quarks (tgc). The cross section limits at the 95% C.L. are sigma_tgu<0.20pb and sigma_tgc<0.27pb. These correspond to limits on the top quark decay branching fractions of B(t->gu)<2.0*10^-4 and B(t->gc)<3.9*10^-3.

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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