EPJ

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EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 27, 555-561 (2003)
DOI: 10.1140/epjc/s2003-01154-0

Effect of fourth generation CP phase on $b\to s$ 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 $b\to s\gamma$, Bs mixing, $B\to K^{(*)}\ell^+\ell^-$, $X_s\ell^+\ell^-$ and $\phi K_{\mathrm {S}}$, 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 $b\to s\gamma$ or CP-violation in $B\to \phi K_{\mathrm {S}}$, 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 $m_{\ell^+\ell^-}$ dependence of the forward-backward asymmetry in $B\to K^{*}\ell^+\ell^-$ 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

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