Higher dimensional operators in standard model effective field theory

admin   2018-03-02 10:55:42   4064

报告题目:Higher dimensional operators in standard model effective field theory
报告时间:2018-03-08 10:00 (星期四)
报告地点:long8唯一官方网站北洋园校区32楼B256
报告人:Prof. Yi Liao(School of Physics, Nankai University)


Abstract: 

Effective field theory is a general approach to describing physics at lowenergy. In this talk I’ll start with the basic ideas of the standard modeleffective field theory (SMEFT). Then I’ll focus on the three subjects that wehave been working on in the past two years. We have made a complete analysis ondimension-seven operators in SMEFT and renormalized a subset of them thatviolates both lepton and baryon numbers. We have developed a simple powercounting rule that controls the leading contribution to one-loop anomalousdimensions of higher dimensional operators. Finally we discuss new higherdimensional operators that arise when the standard model is extended by sterileneutrinos with a mass below the electroweak scale. 

简历 

清华大学工学学士,中国科学院理论物理所理学博士。1994.4.至1996.5.在清华大学long8唯一做博士后研究,1996.6.至2000.9.任清华大学副教授。2000.10.至2005.8.在莱比锡大学从事合作研究(wissen.Mitarbeiter)。2005.8.起任南开大学物理学院教授。曾获得教育部新世纪人才(2006年度)、国家杰出青年科学基金(2010年度)资助。从事粒子物理学、量子场论方面的教学和研究工作。目前的研究工作集中在超越粒子物理标准模型的新物理方向,包括中微子质量产生机制及其唯象学、暗物质粒子及探测的理论研究。

代表作: 

1.  YiLiao, Xiao-Dong Ma, Renormalization GroupEvolution of Dimension-seven Baryon- and Lepton-number-violating Operators,JHEP 1611 (2016) 043 

2.  Ran Ding, Yi Liao, Ji-Yuan Liu, Kai Wang, ComprehensiveConstraints on a Spin-3/2 Singlet Particle as a Dark Matter Candidate, JCAP1305 (2013) 028 

3.  Yi Liao, Cascade Seesaw for Tiny NeutrinoMass, JHEP 1106 (2011) 098 

4.  Yi Liao, Unique Neutrino Mass Operator atany Mass Dimension, Phys. Lett. B694 (2011) 346 

5.  Yi Liao, Ji-Yuan Liu, Long-range ElectronSpin-spin Interactions from Unparticle Exchange, Phys. Rev. Lett. 99 (2007)191804 

6.  Yi Liao, Klaus Sibold, Time orderedperturbation theory on noncommutative space-time. 2. Unitarity, Eur.Phys.J.C25 (2002) 479 

7.  Yi Liao, Xiaoyuan Li, Nonunitarity of CKMmatrix from the vector singlet quark mixing and neutron electric dipole moment,Phys. Lett. B503 (2001) 301 

8.  S. Dittmaier, M. Kramer, Y. Liao, M. Spira, P.M. Zerwas, Higgs radiation off top quarks in e+ e- collisions, Phys. Lett. B441(1998) 383


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