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arXiv 2107.09708hep-phhep-ex
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轴子模型中的变味Higgs衰变和恒星冷却异常

Flavor-Violating Higgs Decays and Stellar Cooling Anomalies in Axion Models

Marcin Badziak, Giovanni Grilli di Cortona, Mustafa Tabet, Robert Ziegler

摘要:

我们研究一类DFSZ类模型的QCD轴子,可以解决观察到的异常恒星冷却。通过抑制与核子的耦合,避免了来自SN 1987 A和中子星的严格约束,而轴子与电子和光子的耦合是相当大的。所有的轴子耦合都依赖于一些参数,这些参数也控制着扩展的希格斯扇区,特别是像标准模型中的希格斯玻色子$h$那样的轻子变味耦合。这使我们能够将轴子和希格斯现象联系起来,我们发现${\rm BR}(h \to τe)$可以大到目前实验界的0.22%,而${\rm BR} (h \to μμ)$可以比标准模型大70%。参数空间的大部分将由下一代轴子太阳观测仪(如IAO实验)进行测试。

英文摘要:

We study a class of DFSZ-like models for the QCD axion that can address observed anomalies in stellar cooling. Stringent constraints from SN1987A and neutron stars are avoided by suppressed couplings to nucleons, while axion couplings to electrons and photons are sizable. All axion couplings depend on few parameters that also control the extended Higgs sector, in particular lepton flavor-violating couplings of the Standard Model-like Higgs boson $h$. This allows us to correlate axion and Higgs phenomenology, and we find that that ${\rm BR}(h \to τe)$ can be as large as the current experimental bound of 0.22%, while ${\rm BR} (h \to μμ)$ can be larger than in the Standard Model by up to 70%. Large parts of the parameter space will be tested by the next generation of axion helioscopes such as the IAXO experiment.

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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