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arXiv 1104.5528hep-ph
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色-八重态-电弱-偶标量与CDF Dijet反常

Color-Octet-Electroweak-Doublet Scalars and the CDF Dijet Anomaly

Linda M. Carpenter, Sonny Mantry

摘要:

我们研究了CDF合作组最近观测到的W + jj末态双喷射不变量质谱中3.2 σ过剩下(8,2)1/2表象中色八隅标量的现象。我们认为该区域的参数空间与一个相当大的质量分裂之间的带电和中性的颜色八隅标量和电弱精密数据一致。我们实施的原则,最小味违反(MFV),以抑制FCNC电流和减少自由参数的数量。在W + jj通道中的过剩对应于较重的中性八重态标量到其较轻的带电伙伴的带电电流衰减,其衰减到两个喷流。在MFV方案中,中性色八重态的产生主要由胶子融合所主导,这是由于汤川对通过初态夸克产生的抑制。因此,由于Yukawa和CKM抑制,预计γ + jj通道中不会出现可见过量。对Z + jj终态的贡献被抑制,其中较重的颜色八重态衰减到该终态是由离壳中性颜色八重态伴侣介导的质谱。MFV允许人们通过两个自由参数的单一比率来控制底夸克在末态喷流中的比例。

英文摘要:

We study the phenomenology of color-octet scalars in the (8, 2)1/2 representation in the context of the 3.2σexcess, in the dijet invariant mass spectrum of the W+jj final state, recently observed by the CDF collaboration. We consider the region of parameter space with a sizable mass splitting between the charged and neutral color-octet scalars and consistent with electroweak precision data. We implement the principle of Minimal Flavor Violation (MFV) in order to suppress FCNC currents and reduce the number of free parameters. The excess in the W+jj channel corresponds to the charged current decay of the heavier neutral octet scalar into its lighter charged partner which decays into the two jets. In the MFV scenario, the production of the neutral color-octet is dominated by gluon fusion due to the Yukawa suppression of production via initial state quarks. As a result, no visible excess is expected in the γ+jj channel due to Yukawa and CKM suppression. Contributions to the Z+jj final state are suppressed for a mass spectrum where the decay of the heavier color-octet to this final state is mediated by an off-shell neutral color-octet partner. MFV allows one to control fraction of bottom quarks in the final state jets by a single ratio of two free parameters.

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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