第309期“工物学术论坛”
报告题目：Recents results on the CKM angle gamma with ?open charm B decays at LHCb
报 告 人：Vincent ?Tisserand教授
法国克莱蒙费朗物理实验室
报告时间：2018年11月23日10:30-11:30
报告地点：清华大学刘卿楼104
主 ?持 人：杨振伟 副教授

报告摘要：
The precise measurement of the angle? of the ?Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle is a central topic ?in flavour physics experiments. Its determination at the subdegree ?level in tree-level open-charm b-hadron decays is theoretically clean ?and provides a standard candle for measurements sensitive to new ?physics effects as accessible through global coherence tests of the KM ?mechanism, with respect to the Standard Model expectations.
?In ?addition to the results from the B factories (i.e. BaBar and Belle), ?various recent measurements from the LHCb experiment at CERN allow the ?angle? to be determined with an uncertainty of around 5°. However, no ?single measurement dominates the world average, as the most accurate ?measurements have an accuracy of about 10° to 20°.
We review ?those recent result and introduce alternative methods that are ?therefore important to improve the precision.? Among them, an analysis ?of the decay B?? to D???*?φ has the potential to make a significant ?impact.
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报告人简介：
Dr. Vincent Tisserand is an expert on ?heavy flavour physics, especially on CKM angle gamma measurements. ?After his Ph. D study in Universite Paris 11, he obtained the ?permanent position in CNRS, France, working on the BaBar experiment. ?He is currently a member of LHCb experiment and CKMfitter group. Dr. ?Vincent Tisserand led the LHCb group in CNRS Annecy Laboratory of ?Particle Physics (LAPP) from 2012 to 2017 before moving to LPC in ?Clermont Ferrand. He also served as member for many scientific ?committees, such as Editorial board member of the LHCb experiment, ?member of CNRS recruitment committee etc.