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.
　

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