Strong CP violation: fact and fancy

by Prof. Goran Senjanović

Thursday 2 Jan 2020, 15:30 → 16:30 Asia/Shanghai

300-02 (Tsung-Dao Lee Institute (East wing of Pao Yue-Kong Library))

Abstract:

I start by recalling that there is no strong CP problem in the Standard Model - and thus there can be no solution. I go then through the most popular ‘solutions’ and show how they fare no better than the SM, but simply trade the small strong CP parameter for other ad-hoc assumed small terms. In particular, I focus on the PQ mechanism with the axion and discuss its pros and cons. 

Biography:

Goran Senjanović is a theoretical physicist at the Abdus Salam International Centre for Theoretical Physics. He received his Ph.D at the City College of New York in 1978. Collaborated with Rabindra Mohapatra, he invented mechanism of spontaneous parity violation when he was a graduate student. He is also one of the fathers of the seesaw mechanism. Before joining ICTP in 1991, he worked as a staff member at the Brookhaven National Laboratory and as a professor of physics at the University of Zagreb. His major research interests are neutrino physics, unification of elementary particle forces, baryon and lepton number violation and supersymmetry.