Effect of fourth generation CP phase on transitionsA. Arhrib1, 2 and W.-S. Hou3
1 Max-Planck Institut für Physik, Föhringer Ring 6, 80805 München, Germany
2 LPHEA, Physics Department, Faculty of Science-Semlalia, P.O.B. 2390, Marrakesh, Morocco
3 Department of Physics, National Taiwan University, Taipei, Taiwan 10764, R.O.C.
(Received: 20 November 2002 / Published online: 7 March 2003 )
We study the effect of a sequential fourth generation on , Bs mixing, , and , taking into account the presence of a new CP phase in quark mixing. We find that the effects via electromagnetic and strong penguins, such as in or CP-violation in , are rather mild, but the impact via boxes or Z penguins is quite significant. Not only can one have a Bs mixing much larger than expected, even if it is measured near the present limit, mixing-dependent CP-violation could become maximal. For electroweak penguin modes, the fourth generation can provide the enhancement that perhaps may be needed, while the dependence of the forward-backward asymmetry in can further probe for the fourth generation. These effects can be studied in detail at the B factories and the Tevatron.
© Società Italiana di Fisica, Springer-Verlag 2003