Effect of fourth generation CP phase on b → s transitions
Journal
European Physical Journal C
Journal Volume
551
Journal Issue
1-2
Pages
555-561
Date Issued
2003
Author(s)
Abstract
We study the effect of a sequential fourth generation on b → sγ, Bs, mixing, B → K(*)ℓ+ℓ-, Xsℓ+ℓ- and φKS, 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 → sγ or CP-violation in B →KS, 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 mℓ+ℓ- dependence of the forward-backward asymmetry in B → K*ℓ+ℓ- can further probe for the fourth generation. These effects can be studied in detail at the B factories and the Tevatron.
Type
journal article