School of Physics Colloquia

Monday 9 October

Professor George Wei-Shu HOU, National Taiwan University
Higgs Sector and Flavour Physics

The Higgs boson was discovered in 2012, while the Cabibbo-Kobayashi-Maskawa (CKM) paradigm for quark flavour mixing was confirmed at the B factories in 2001, resulting in Nobel prizes given in 2013 and 2008. I participated in both experimental efforts, but certainly received no prize. No New Physics, however, has emerged at the Large Hadron Collider (LHC) so far, with silence disturbed only by some flavour "anomalies". The CKM mixing matrix and the hierarchical mass pattern of charged fermions are all just expressions of Yukawa couplings to the Higgs sector, enriched by three copies each for up-type, down-type and electron-type fermions. This motivates one to consider a second Higgs boson doublet, but the "alignment" phenomenon, that the observed 125 GeV boson behaves just-like the Higgs boson of the Standard Model, pushes the second Higgs doublet out of reach at the LHC.

In this talk we explore the Higgs-Flavour connection, and point out how a
Two Higgs Doublet Model that permits flavour-changing couplings of heavy neutral Higgs bosons can account for the apparent alignment, paving the way for potential LHC discovery, as well as impact on flavour physics and CP violation, and could in fact account for Baryon Asymmetry of our Universe.

11.00am, Slade Lecture Theatre, Physics Building A28

Cake and coffee are served at all School Colloquia.

Future Colloquia

Monday, 23 October: Dr Paul Butler, Carnegie Institution for Science

Monday, 6 November: Professor Damien Hicks, Swinburne University of Technology

Monday, 4 December: Associate Professor Csaba Balazs, Monash University