George W.S. Hou (National Taiwan University)

CP violation for the Heaven and the Earth, plus more

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 antimatter in our Universe. A large and unexpected difference in direct CPV between charged and neutral B → K π decays, observed by Belle and BaBar, offers a possible clue for beyond SM source of CPV, but 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 possible 4th generation source, predicting that sin 2Φ(Bs) in Bs → J/ψ φ 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 sin2Φ(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 1015, and may even suffice. It is even possible that electroweak symmetry breaking itself arises through the strong Yukawa couplings of the 4th generation quarks. We outline a direct search program for the 4th generation at the LHC (CMS in particular), aimed for early data. We should learn the answer in 3-5 years.

This talk will present both experimental and phenomenological results.



zurück zur Seminar Hauptseite