An experimental search for muon-electron conversion in nuclear field at sensitivity of 10~(?14) with a pulsed proton beam

摘要

A new experiment searching for μ-e conversion in nuclear field by fully utilizing a high-power pulsed proton beam available at J-PARC Material and Life Science Facility is described. The muonic atom formation rate in a siliconcarbide primary-proton target will be 10~(10)/s for 1 MW operation of a J-PARC RCS booster. With this high formation rate of the muonic atoms, it is possible to perform a competitive search for μ-e conversion in nuclear field at 10~(?14) level of the branching ratio, nearly two orders of magnitudes below current limits. A new secondary beam line will be dedicated to extract 105-MeV/c electrons from the primary-proton target.