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arXiv 1706.01463hep-phhep-ex
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$B$反常下有味复合矢量玻色子的唯象

Phenomenology of flavorful composite vector bosons in light of $B$ anomalies

Shinya Matsuzaki, Kenji Nishiwaki, Ryoutaro Watanabe

摘要:

我们分析了复合矢量玻色子的味结构中产生的矢量人工色,通常被称为hypercolor(HC)的模型,与八种口味,形成一个家庭的内容HC费米子。复合矢量玻色子(本文简称HC ρ)的动力学与HC介子一起由隐藏局域对称性(HLS)以类似于QCD矢量介子的方式表述。然后描述了与尊重HLS规范对称性的标准模型(SM)费米子的耦合性质,即HC rhos与左手SM夸克和轻子的耦合是通过考虑味混合结构的良好定义的设置给出的。在目前的情况下,我们讨论了从电弱精密测试,风味物理和对撞机物理模型的显着界限。我们还试图解决过程中的B异常,如B -> K(*)mu+ mu-和B -> D(*)tau nu,最近由LHCb,Belle,(ATLAS和CMS部分报道)。然后,我们发现,本模型可以解释的异常B -> K(*)mu+ mu-一致的其他限制,而它预测没有显着的偏差B -> D(*)τ nu从SM,这可以在未来的Belle II实验进行检查。对于有效算子b -> s μ + μ-,前者的Wilson系数的形式为C_9 = -C_10,这已被最近的实验数据所证实。我们还调查了大型强子对撞机(LHC)当前和未来的实验极限,并看到可能的对撞机信号来自dijet和ditau,或dimuon共振搜索目前的情况下与TeV的质量范围。总之,目前的b -> s mu+ mu-异常可能意味着在HC rho模型的背景下,在ditau或dimuon通道中发现了新的矢量玻色子。我们的模型可以看作是传统U(1)模型的UV完备化。

英文摘要:

We analyze the flavor structure of composite vector bosons arising in a model of vectorlike technicolor, often called hypercolor (HC), with eight flavors that form a one-family content of HC fermions. Dynamics of the composite vector bosons, referred to as HC rho in this paper, are formulated together with HC pions by the hidden local symmetry (HLS), in a way analogous to QCD vector mesons. Then coupling properties to the standard model (SM) fermions, which respect the HLS gauge symmetry, are described in a way that couplings of the HC rhos to the left-handed SM quarks and leptons are given by a well-defined setup as taking the flavor mixing structures into account. Under the present scenario, we discuss significant bounds on the model from electroweak precision tests, flavor physics, and collider physics. We also try to address B anomalies in processes such as B -> K(*) mu+ mu- and B -> D(*) tau nu, recently reported by LHCb, Belle, (ATLAS, and CMS in part.) Then we find that the present model can account for the anomaly in B -> K(*) mu+ mu- consistently with the other constraints while it predicts no significant deviations in B -> D(*) tau nu from the SM, which can be examined in the future Belle II experiment. The former is archived with the form C9 = -C10 of the Wilson coefficients for effective operators of b -> s mu+ mu-, which has been favored by the recent experimental data. We also investigate current and future experimental limits at the Large Hadron Collider (LHC) and see that possible collider signals come from dijet and ditau, or dimuon resonant searches for the present scenario with TeV mass range. To conclude, the present b -> s mu+ mu- anomaly is likely to imply discovery of new vector bosons in the ditau or dimuon channel in the context of the HC rho model. Our model can be considered as a UV completion of conventional U(1)' model.

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