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arXiv 1104.4560hep-phhep-ex
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与第二代夸克耦合的CDF双喷射过剩和Z '_{cs}

The CDF dijet excess and Z'_{cs} coupled to the second generation quarks

Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song

摘要:

最近,CDF合作报告了Wjj事件的dijet不变质量分布的过剩,对应于3.2个标准差的显著性。考虑到在$γjj$和$Z jj$事例中还没有类似的超数,我们提出了一个新的Z'模型:Z'只与第二代夸克耦合. $\zsc$的单产生以及与$W,γ, Z$的联合产生主要来自海夸克。只有$W Z'$的产生有来自一个价夸克和一个海夸克的额外贡献,这是CKM混合所允许的。我们发现,如果新的规范耦合足够大,微扰允许的边缘,这个新的模型可以解释所观察到的CDF $Wjj$异常以及缺乏$\gm jj$和$Z jj$异常。Z '-b-b的消失耦合使该模型不受pbar ->WH -> lνb \bar{b}的约束。

英文摘要:

Recently the CDF collaboration has reported the excess in the dijet invariant-mass distribution of the Wjj events, corresponding to a significance of 3.2 standard deviations. Considering the lack of similar excesses in the $γjj$ and $Z jj$ events yet, we propose a new Z' model: Z' couples only to the second generation quarks. Single production of $\zsc$ as well as associated production with $W,γ, Z$ are mainly from the sea quarks. Only $W Z'$ production has additional contribution from one valence quark and one sea quark, which is allowed by CKM mixing. We found that if the new gauge coupling is large enough, marginally permitted by perturbativity, this new model can explain the observed CDF $Wjj$ anomaly as well as the lack of $\gm jj$ and $Z jj$ anomalies. Vanishing coupling of Z'-b-b protects this model from the constraint of p pbar ->WH -> lνb \bar{b}.

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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