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arXiv 0902.3322hep-ph
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Kaluza-Klein胶子与b-jet前后不对称性

Kaluza-Klein gluon and b-jet forward-backward asymmetry

Gi-Chol Cho, Yoshimi Kanehata

摘要:

在LEP/SLD实验中测量的$Z$ -极上的$b$ -夸克喷注的前后不对称性表明,与标准模型(SM)的预测相比,$σ$的前后不对称性有-2.8- $σ$的偏差。本文在Randall和Sundrum的扭曲额外维模型的基础上,研究了Kaluza-Klein(KK)胶子解释$\afbb$数据的可能性.在这种情况下,通过适当选择体夸克质量项,KK胶子与$b$ -夸克强耦合。我们发现$\afbb$数据可以用几百GeV的KK胶子质量来解释。从强子对撞机实验的限制,我们的方案进行了讨论。

英文摘要:

The forward-backward asymmetry of $b$-quark jets on the $Z$-pole measured at LEP/SLD experiments shows us -2.8-$σ$ deviation from the Standard Model (SM) prediction. We examine a possibility of Kaluza-Klein (KK) gluon to explain the $\afbb$ data in a scenario based on the warped extra dimension model by Randall and Sundrum. In this scenario, the KK gluon strongly couples to $b$-quark by an appropriate choice of the bulk quark mass terms. We find that the $\afbb$ data could be explained if the KK gluon mass is few hundred GeV. Constraints on our scenario from the hadron collider experiments are discussed.

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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