22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

A brief (p)review on a possible fourth generation world to come

24 Jul 2010, 17:00
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays


Prof. George Wei-Shu Hou (National Taiwan University (NTU))


From a thread in the "Direct CPV difference" in charged vs neutral B -> K pi decays observed at the B factories, a possible large and negative mixing-dependent CPV in Bs -> J/psi phi is predicted, if the former arises at least partially from 4th generation t' effect in the Z-penguin. Surprisingly, there is some standing hint at the Tevatron. Whether or not these flavor and CPV effects bear up, a 4th generation would help us soar to the heavens: there seems to be enough CPV for the baryon asymmetry of the Universe. A separate thread is the ever increasing bounds on t' and b' at the Tevatron, implying large Yukawa coupling. Direct search can only be settled at the LHC, and the partial wace unitarity bound is only a glass ceiling. What is intriguing is the possibility of EW symmetry breaking due to the NJL-type condensation of very heavy 4th generation quarks, where we outline two scenarios that can be pursued on the lattice: Higgs-Yukawa Lagrangian, and the electrweak theory as we know it, without ever mentioning the Higgs boson. If the pursuit of 4th generation quark search at the LHC bears fruit, we may simultaneously touch upon two of the greatest problems in particle physics, and even cosmology: source of EW symmetry breaking (raison d'etre for LHC); and source of CPV for BAU (raison d'etre for ourselves). Implications for flavor and other physics would be further discussed.

Primary author

Prof. George Wei-Shu Hou (National Taiwan University (NTU))

Presentation Materials