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arXiv 2104.05006hep-ph
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μ子$g-2$和$b \to s \bar μμ$反常的味特异性$U(1)_{B_q-L_μ}$规范模型

Flavor Specific $U(1)_{B_q-L_μ}$ Gauge Model for Muon $g-2$ and $b \to s \bar μμ$ Anomalies

Jian-Yong Cen, Yu Cheng, Xiao-Gang He, Jin Sun

摘要:

μ子$(g-2)_μ$和$b\to s \bar μμ$引起的$B$反常作为标准模型(SM)之外新物理的线索,引起了人们的广泛关注。这两个反常现象表明可能存在与μ子有关的新的相互作用。人们提出了许多理论观点来解释这些异常现象。计量风味特异性$U(1)_{B_q-L_μ}$是其中有前途的。由$U(1)_{B_q-L_μ}$产生的新规范玻色子$Z'$与μ子相互作用,为解决$(g-2)_μ$反常提供了必要的成分.通过对夸克质量矩阵在弱本征态基和质量本征态基之间对角化,$Z'$ -夸克耦合可以产生变味相互作用。我们重新审视这些模型的挑战,试图解释的$(g-2)_μ$和$B$异常分别或同时。我们发现,虽然$U(1)_{B_q-L_μ}$模型仍然有参数空间,以提供解决方案,分别解释$(g-2)_μ$和$B$异常,有没有参数空间,这样的模型,以解决这两个异常同时考虑到现有的约束条件,从$τ\to μγ$,$τ\to 3 μ$,中微子三叉戟和$B_s - \bar B_s$数据。其中轻子过程限制$Z^\prime$质量小于几百兆电子伏,如果需要解决的$(g-2)_μ$异常,这会导致数据之间的冲突,从$B_s - \bar B_s$,$D^0 - \bar D^0$混合和强子衰变与$Z^\prime$在最后的状态。本文还研究了$U(1)_Y$和$U(1)_{B_q-L_μ}$动力学混合对这些异常的影响。我们发现,这些影响也不能做太多的工作,使两个异常一起被同时解决。

英文摘要:

The muon $(g-2)_μ$ and $b\to s \bar μμ$ induced $B$ anomalies as hints of new physics beyond the standard model (SM) have attracted much attention. These two anomalies indicate that there may exist new interaction specifically related to muon. A lot of theoretical ideas have been proposed to explain these anomalies. Gauged flavor specific $U(1)_{B_q-L_μ}$ is among the promising ones. The new gauge boson $Z'$ from $U(1)_{B_q-L_μ}$ interacts with muon and provides necessary ingredient to solve the $(g-2)_μ$ anomaly. The $Z'$-quark coupling can generate flavor changing interactions after diagonalization of quark mass matrix between weak eigen-state and mass eigen-state basis. We revisit challenges for such models attempting to explain the $(g-2)_μ$ and $B$ anomalies separately or simultaneously. We find although for $U(1)_{B_q-L_μ}$ models there is still parameter space to provide solutions for separately explaining the $(g-2)_μ$ and $B$ anomalies, there exists no parameter space for such models to solve both the anomalies simultaneously, after taking into account existing constraints from $τ\to μγ$, $τ\to 3 μ$, neutrino trident and $B_s - \bar B_s$ data. Among them leptonic processes restrict $Z^\prime$ mass to be less than a few hundred MeV if required to solve the $(g-2)_μ$ anomaly, which causes conflict between data from $B_s - \bar B_s$, $D^0 - \bar D^0$ mixing and also hadron decays with $Z^\prime$ in the final states. The effects of $U(1)_Y$ and $U(1)_{B_q-L_μ}$ kinetic mixing on these anomalies are also studied. We find that neither can these effects do much to bring the two anomalies together to be solved simultaneously.

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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