Lepton-flavor violating axions at MEG II
Yongsoo Jho (Theoretical Physics Department, CERN, Geneva, Switzerland, Department of Physics and IPAP, Yonsei University, Seoul, 03722, Republic of Korea); Simon Knapen (Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA, Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, CA, 94720, USA); Diego Redigolo (Theoretical Physics Department, CERN, Geneva, Switzerland, INFN, Sezione di Firenze, Via G. Sansone 1, Sesto Fiorentino, 50019, Italy)
We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through μ + → e + aγ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II signal efficiency can be improved significantly if a new trigger can be implemented in a dedicated run with a reduced beam intensity. This search would establish the world leading measurement in this channel with only 1 month of data taking.