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Testing the Standard Model with the lepton g-2 |
2015-09-30
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Institute of Theoretical Physics | Chinese Academy of Sciences | State Key Laboratory of Theoretical Physics | Seminar | | Title 题目 | Testing the Standard Model with the lepton g-2 | Speaker 报告人 | Massimo Passera | Affiliation 所在单位 | INFN, Padova, Italy | Date 日期 | 15:30, Sep 30 (Wednesday), 2015 | Venue 地点 | ITP New Building 6420, 理论物理研究所新楼四层多媒体教室 | Abstract 摘要 | The anomalous magnetic moment of the muon (the muon "g-2") is one of the most celebrated tests of the Standard Model (SM). On the other hand, it is believed that new-physics contributions to the electron g-2 are too small to be relevant and, with this assumption, its measurement is employed to determine the fine-structure constant. I will discuss some recent developments in the long-standing discrepancy between experiment and the Standard Model prediction of the muon g-2 and argue that the electron g-2 may soon be used to probe new physics as well. I will also discuss possible methods to improve the present limits on the g-2 of the tau lepton using radiative leptonic tau decays. I will conclude discussing the puzzling 3.5 sigma discrepancy which has recently been observed between the SM prediction of the branching ratio $\tau to e \bar{\nu} \nu \gamma)$ and its measurement at BaBar. | Contact Personn 所内合作者 | Jin-Min Yang (杨金民),Lorenzo Calibbi |
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