DOI: 10.1140/epjc/s2003-01154-0
Effect of fourth generation
CP phase on
transitions
A. 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 )
Abstract
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