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(Dec. 18) Searching for Muon to Electron Conversion in a Muonic Atom

Last updated :2017-12-11

Topic: Searching for Muon to Electron Conversion in a Muonic Atom - Quest for new physics
Speaker: Professor Yoshitaka Kuno
(Osaka University)
Moderator: Associate Professor TANG Jian
Time: 10:00-11:00 am, Monday, December 18, 2017
Venue: Room 300, Ten Alumni Hall, Guangzhou South Campus, SYSU

Abstract:
Flavour transitions in elementary particles have provided historically great discoveries in the past, such as the quark mixing and its CP violation, and also the neutrino oscillation.But those in charged leptons (named charged lepton flavour violation) have yet to be observed. Since they are forbidden in the Standard Model, observation of such processes would indicate definitely new physics beyond the Standard Model. The process of muon to electron conversion in a muonic atom is one of the processes of charged lepton flavour violation. Recently there has been significant progress of accelerator based muon sources, where the muon yields can be increased by about three orders of magnitude by using superconducting solenoids. It allows to initiate next-generation experiments to search for muon to electron conversion with improvement of four orders of magnitude in its experimental sensitivity over the current limits, going down to 10 -16 in its branching ratio. There are two experiments being prepared, one of which is the COMET (COherent Muon to Electron Transition) experiment in J-PARC (Japan Proton Accelerator Research Complex), Japan, and the other is the Mu2e experiment in the Fermi National Laboratory, US. This talk will discuss mainly the COMET, Japan. The first phase of the staged COMET experiment will start in a few years from now. We describe its physics motivation, an outlook on the COMET experiment and challenges.

About the speaker:
In 1984, Prof. Yoshitaka Kuno graduated from the University of Tokyo. In 1984, he became a research associate at the University of Tokyo. In 1985, he moved to TRIUMF, Canada, as a research associate. In 1988, he became a research scientist (a tenure position) at TRIUMF, Canada. In 1992, he became an associate professor at the National Laboratory for High Energy Physics (KEK) in Japan, which was renamed to the High Energy Accelerator Research Organization (KEK) later. In 2000, he became a full professor at Osaka University.