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arXiv 2009.02197hep-phhep-ex
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$U(1)_{B_3-L_2}$中性线电流$B-$异常说明

$U(1)_{B_3-L_2}$ Explanation of the Neutral Current $B-$Anomalies

B. C. Allanach

摘要:

我们研究了一种推测性的短距离力,它被用来解释$B$强子的某些中性电流衰变的测量结果与标准模型预测结果之间的差异。这种力来自标准模型的自发破缺的规范$U(1)_{B_3-L_2}$扩展,其中标准模型场的额外量子数由第三族重子数减去第二族轻子数给出。唯一超出标准模型的场是三个右手中微子,一个与$U(1)_{B_3-L_2}$有关的规范场和一个破坏$U(1)_{B_3-L_2}$(一种“黄酮”)的标准模型单重复合标量。这个简单的模型,通过涉及TeV尺度的力携带$Z^\prime$矢量玻色子的相互作用,可以成功地解释中性电流$B-$异常,同时容纳其他经验约束。在一个费米子混合的分析中,最新的$B-$异常拟合,LHC直接$Z^\prime$搜索限制和其他界限的组合排除了域0.15 TeV $< M_{Z^\prime} <$ 1.9 TeV在95 $\%$置信水平。对于质量更大的$Z^\prime$ s,该模型具有{ \em flavonstrahlung}\信号,其中$pp$碰撞产生一个$Z^\prime$和一个flavon,随后衰变为两个希格斯玻色子。

英文摘要:

We investigate a speculative short-distance force, proposed to explain discrepancies observed between measurements of certain neutral current decays of $B$ hadrons and their Standard Model predictions. The force derives from a spontaneously broken, gauged $U(1)_{B_3-L_2}$ extension to the Standard Model, where the extra quantum numbers of Standard Model fields are given by third family baryon number minus second family lepton number. The only fields beyond those of the Standard Model are three right-handed neutrinos, a gauge field associated with $U(1)_{B_3-L_2}$ and a Standard Model singlet complex scalar which breaks $U(1)_{B_3-L_2}$, a `flavon'. This simple model, via interactions involving a TeV scale force-carrying $Z^\prime$ vector boson, can successfully explain the neutral current $B-$anomalies whilst accommodating other empirical constraints. In an ansatz for fermion mixing, a combination of up-to-date $B-$anomaly fits, LHC direct $Z^\prime$ search limits and other bounds rule out the domain 0.15 TeV$< M_{Z^\prime} <$ 1.9 TeV at the 95$\%$ confidence level. For more massive $Z^\prime$s, the model possesses a {\em flavonstrahlung}\ signal, where $pp$ collisions produce a $Z^\prime$ and a flavon, which subsequently decays into two Higgs bosons.

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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