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arXiv 1208.2973hep-phhep-ex
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Higgs双光子衰变和μ g-2的暗面

Dark Side of Higgs Diphoton Decays and Muon g-2

Hooman Davoudiasl, Hye-Sung Lee, William J. Marciano

摘要:

我们认为,LHC对Higgs双光子过剩的暗示以及μ介子g-2(g_mu-2)的理论与实验之间的差异,可能与U(1)_Y超荷和"暗" U(1)_d下的矢量类"轻子"有关。这种轻子的量子环能增强Higgs双光子速率,并导致U(1)_Y-U(1)_d动力学混合.轻U(1)d规范玻色子Z d与电荷的感应耦合可以很自然地解释g mu-2的测量结果。我们在比较电子g-2实验和理论的基础上更新了Z_d的质量和耦合约束,发现在满足其他约束的情况下解释g_mu-2需要Z_d的质量为20 - 100 MeV。我们预测了新的希格斯衰变通道gamma Z_d和Z_d Z_d,其速率低于双光子模式,但可能是可观测的。在这些衰变中,增强的Z_d~-> e + e~-将模拟迅速转换的光子,并能提供一部分表观双光子过剩。更多的统计数据或对现存数据的更仔细的检查可能会揭示这些事件。

英文摘要:

We propose that the LHC hints for a Higgs diphoton excess and the muon g-2 (g_mu-2) discrepancy between theory and experiment may be related by vector-like "leptons" charged under both U(1)_Y hypercharge and a "dark" U(1)_d. Quantum loops of such leptons can enhance the Higgs diphoton rate and also generically lead to U(1)_Y - U(1)_d kinetic mixing. The induced coupling of a light U(1)_d gauge boson Z_d to electric charge can naturally explain the measured g_mu-2. We update Z_d mass and coupling constraints based on comparison of the electron g-2 experiment and theory, and find that explaining g_mu-2 while satisfying other constraints requires Z_d to have a mass ~ 20-100 MeV. We predict new Higgs decay channels gamma Z_d and Z_d Z_d, with rates below the diphoton mode but potentially observable. The boosted Z_d -> e+e- in these decays would mimic a promptly converted photon and could provide a fraction of the apparent diphoton excess. More statistics or a closer inspection of extant data may reveal such events.

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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