ZOOM链接：https://zoom.us/j/88944759750

会议号：889 4475 9750

密码：20111111

报告摘要：

In this seminar, I am going to introduce the physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs. muons, Re/μ, 15 times more precisely than the current experimental result, reaching the precision of the Standard Model (SM) prediction at 1 part in 10,000. Considering several inconsistencies between the SM predictions and data pointing towards the potential violation of lepton flavor universality, the PIONEER experiment will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles up to the PeV mass scale. The later phases of the PIONEER experiment aim at improving the experimental precision of the branching ratio of pion beta decay (BRPB), π⁺→π⁰e⁺ν(γ), currently at 1.036(6)×10⁻⁸, by a factor of three (Phase II) and an order of magnitude (Phase III). Such precise measurements of BRPB will allow for tests of CKM unitarity considering the Cabibbo Angle Anomaly and the theoretically cleanest extraction of |Vud| at the 0.02% level, comparable to the deduction from superallowed beta decays. 

报告人简介：

钱鑫，美国布鲁克海文实验室物理系，教授

学历：
Duke University，Ph.D. Experimental Nuclear Physics，May 2010
Peking University，B.S. Physics，July 2003

工作经历：
Brookhaven National Laboratory, Tenured Physicist，Apr. 2020 –
Stony Brook University，Associate Adjunct Professor，Sep. 2020 –
Brookhaven National Laboratory，Physicist，Oct. 2017-Apr. 2020
Brookhaven National Laboratory，Associate Physicist，Oct. 2015-Oct.2017
Brookhaven National Laboratory, Assistant Physicist，Oct. 2013-Oct. 2015
Brookhaven National Laboratory，Research Associate，May 2013-Oct. 2015
California Institute of Technology，Robert A. Millikan Postdoctoral Scholar，2010-2013

“论坛”主请人联系方式：

王喆：wangzhe-hep@tsinghua.edu.cn