Probing axion-like particles in leptonic decays of heavy mesons  

作　　者：Gang Yang Tianhong Wang Guo-Li Wang 杨钢;王天鸿;王国利(School of Physics,Harbin Institute of Technology,Harbin 150001,China;Department of Physics,Hebei University,Baoding 071002,China)

机构地区：[1]School of Physics,Harbin Institute of Technology,Harbin 150001,China [2]Department of Physics,Hebei University,Baoding 071002,China

出　　处：《Chinese Physics C》2025年第1期154-163,共10页中国物理C(英文版)

基　　金：was supported by the National Natural Science Foundation of China(12375085,12075073);supported by the Fundamental Research Funds for the Central Universities(2023FRFK06009)。

摘　　要：We study the possibility of finding axion-like particles(ALPs)through the leptonic decays of heavy mesons.The Standard Model(SM)predictions of the branching ratios of the leptonic decays of heavy mesons are less than the corresponding experimental upper limits.This provides some room for the existence of decay channels,of which the ALP is one of the products.Three scenarios are considered:First,the ALP is only coupled to one single charged fermion,namely,the quark,the antiquark,or the charged lepton;second,the ALP is only coupled to quark and antiquark with the same strength;and third,the ALP is coupled to all the charged fermions with the same strength.The constraints of the coupling strength in different scenarios are obtained by comparing the experimental data of the branching ratios of leptonic decays of B^(-),D^(+),and D_(S)^(+),mesons with the theoretical predictions achieved by using the Bethe-Salpeter(BS)method.These constraints are further applied to predict the upper limits of the leptonic decay processes of the B_(C)^(-) meson in which the ALP participates.

关 键 词：heavy meson BS equation AXION 

分 类 号：O57[理学—粒子物理与原子核物理]