arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1105.3158hep-ph
收藏

翘曲额外维模型中底夸克和顶夸克的前后不对称性:来自LEP和Tevatron反常的LHC预言

Forward-backward asymmetries of the bottom and top quarks in warped extra-dimensional models: LHC predictions from the LEP and Tevatron anomalies

A. Djouadi, G. Moreau, F. Richard

摘要:

在弯曲额外维度的范例中,第三代夸克被认为是对标准模型之外的效应最敏感的。因此,在LEP和Tevatron对撞机上观察到的底夸克(A_FB^b)和顶夸克(A_FB^t)的前后不对称性的异常可以被看作是扭曲的额外维度场景的早期特征。我们提出了这样一个方案的实现,与规范保管对称的散装,这允许同时解决的A_FB^b异常和最近观察到的差异A_FB^t在高顶夸克快度和ttbar不变质量。我们还表明,从LEP,Tevatron和大型强子对撞机所产生的各种唯象约束可以满足所考虑的模型。该模型预测了7 TeV大型强子对撞机顶夸克对产生的新特征,由质量约1.5-2 TeV的胶子的Kaluza-Klein激发引起。

英文摘要:

Within the paradigm of warped extra dimensions, third generation quarks are expected to be the most sensitive to effects beyond the Standard Model. The anomalies observed at the LEP and Tevatron colliders in the forward-backward asymmetries of the bottom (A_FB^b) and top (A_FB^t) quarks can thus be seen as early signatures of warped extra-dimensional scenarios. We propose a realization of such a scenario, with a gauge custodial symmetry in the bulk, which allows to address simultaneously the A_FB^b anomaly and the discrepancies observed recently on A_FB^t at high top quark rapidities and ttbar invariant masses. We also show that the various phenomenological constraints arising from LEP, Tevatron and LHC can be satisfied within the considered model. The model predicts new features, induced by a Kaluza-Klein excitation of the gluon at a mass ~1.5-2 TeV, in top quark pair production at the 7 TeV LHC.

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。

↑