Exploring muonphilic ALPs at muon colliders  

作　　者：卢致廷 罗小艺 魏新琪 Chih-Ting Lu;Xiaoyi Luo;Xinqi Wei(Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210023,China

出　　处：《Chinese Physics C》2023年第10期22-40,共19页中国物理C（英文版）

摘　　要：Axion-like particles(ALPs)are new particles that extend beyond the standard model(SM)and are extensively investigated.When considering ALPs within an effective field theory framework,their couplings with SM particles can be studied independently.It is a daunting task to search for GeV-scale ALPs coupled to muons in collider experiments because their coupling is proportional to the muon mass.However,a recent study by Altmannshofer,Dror,and Gori(2022)highlighted the importance of a four-point interaction,W-μ-νμ-a,as well as interactions from the chiral anomaly,whose couplings are not dependent on the muon mass.These interactions provide a new opportunity to explore muonphilic ALPs(μALPs)at the GeV scale.We explore variousμALP production channels at muon colliders withμALPs decaying into a pair of muons.In particular,we find that a pair of neutrinos accompanied by aμALP is the most effective channel to search forμALPs in the electrowek violating(EWV)scenario.In contrast,a photon plus aμALP becomes a better channel to search forμALPs in the electroweak preserving(EWP)scenario because there is no W-μ-νμ-a interaction in this situation.Most importantly,we find that the future bounds forμALPs in the EWV scenario are considerably stronger than those in the EWP scenario and the existing bounds for exploringμALPs with 1 GeV≤ma≲MW.

关 键 词：axion-like particles effective field theory future colliders 

分 类 号：O572.33[理学—粒子物理与原子核物理]