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核与粒子物理学术报告会 38

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Nuclear and Particle Physics Colloquium 38
(核与粒子物理学术报告会38)

Place: Room 513, Main Building, Beihang University

Time: 10:30-12:00, June 22, 2017

Title: Measurable CP violation in charm decays

Speaker: 于福升副教授,兰州大学

Abstract:

CP violation plays an important role in interpreting the matter-antimatter asymmetry in the Universe and searching for new physics beyond the Standard Model. So far CP violation has not been observed in the charm sector. Searching for CPV is one major goal of charm physics. We find new measurable effect of CP asymmetries in the non-leptonic charmed hadron decaying into neutral kaons in the Cabibbo-favored and doubly Cabibbo-suppressed processes. Compared to the CP asymmetries in the singly Cabibbo-suppressed processes, the advantages of this new effect include avoiding ambiguities from penguin contributions in theory, with only tree-level amplitudes available to be extracted from the data of branching fractions. Besides, such processes having larger branching fractions benefits for measurements in experiment. The values of such CP asymmetries are at the order of 10^{-3} and hence are accessible by the LHCb and Belle II experiments in the near future. Besides, the measurement and determination of time-dependent CP asymmetries at t=0 is a smoking gun of direct CP violation in charm decays and signal of new physics.

About the speaker:
 
于福升,2008年毕业于上海大学物理系,2008年至2013年就读于中国科学院高能物理研究所并获理学博士学位,巴黎第十一大学联合培养博士生,2013年至今为兰州大学核科学与技术学院副教授。从事粒子物理理论方面的研究工作,包括重味物理相关的唯象学、精确检验粒子物理标准模型和寻找超出标准模型的新物理。提出因子化辅助的拓扑图方法,是目前对D介子弱衰变过程理解得最有效的方法,预言的直接CP破坏值被LHCb实验验证,得到国际广泛关注。到目前在国际主流期刊发表多篇学术论文,多次应邀在国际国内重要会议上做学术报告。论文被国际上著名的各大实验组多次引用。
 
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