Joint Experimental-Theoretical Seminar

CP violation for the Heaven and the Earth

George W.S. Hou
NTU Taipei

Friday, Feb.6, at 4p.m. in Wilson Hall, room 1 West.
Abstract: Kobayashi and Maskawa received 1/2 the 2008 Nobel prize for their mechanism of CP violation. This Standard Model of CPV, however, falls short by at least 10^-10 from what is needed to satisfy the Sakharov conditions for the absence of antibaryons in our Universe. A large and unexpected difference in direct CPV between charged and neutral B -> Kpi decays, observed by Belle and BaBar, offers a possible clue for beyond SM source of CPV, although it is not free from hadronic uncertainties. From the insight of nondecoupling of heavy chiral quarks in Z penguin and box diagram loops, we have built up the case for a 4th generation source, predicting that sin2Phi_Bs in Bs -> J/psi phi should be large and negative, which is in remarkable agreement with recent hints from the Tevatron. If the current central value stays, the Tevatron could observe sin2Phi_Bs by 2010, and there will be no hadronic uncertainty. Recent updates on the forward-backward asymmetry in B -> K*l+l- by the B factories are also tantalizing. What may be the most astounding is that, having a 4th generation allows the CPV relevant for the Universe to jump by a factor of 10^13 or more, and may even suffice. We outline a direct search program for the 4th generation at the LHC (CMS in particular), aimed for early data. We should know in 3-5 years. This talk will present both experimental and phenomenological results.


Other Fermilab seminars and the weekly calendar.

Directions to Fermilab.

History.

Send comments to Walter Giele.

Security, Privacy, LegalFermi National Accelerator Laboratory