專題演講 Seminar

Title

Kaon neutrinoless double beta decay in effective field theory

Speaker

馬小東博士 (國立臺灣大學物理學系)

Dr. Xiao-dong Ma (Department of Physics, National Taiwan University)

Abstract

We systematically study the lepton number violating process K^± → π^∓l_α^±l_β^± in the framework of effective field theory. We start from dimension-7 operators in standard model effective field theory(SMEFT) to integrate out the heavy standard model states and match onto low energy effective field theory(LEFT) at eletroweak(EW) scale. After including the QCD running effect from EW scale to chiral symmetry breaking scale, we further match the obtained LEFT onto chiral perturbation theory at the later scale to obtain the effective interactions among the relevant mesons and leptons. In this way, we give a master formula numerically for the branching ratio of the process in question as the function of SMEFT parameters. Last, we use the experimental upper bound to constrain the SMEFT parameters.

Language

演講語言 (Language): in English

Hosted by

吳建宏 研究員
Ng, Kin-Wang / Research Fellow