Enhanced KL→π0νν? from direct CP violation in B→Kπ with four generations
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
552
Journal Issue
3
Date Issued
2005
Author(s)
Abstract
Recent CP violation results in B decays suggest that Z penguins may have large weak phase. This can be realized by the four generation (standard) model. Concurrently, B→Xs+- and Bs mixing allow for sizable Vt′s *Vt′b only if it is nearly imaginary. Such large effects in bs transitions would affect sd transitions, as kaon constraints would demand Vt′d0. Using Γ(Z→bb̄) to bound |Vt′b|, we infer sizable |Vt′s
Vt′b
Vus|. Imposing εK, K+→π+νν ̄ and ε′/ε constraints, we find Vt′d *Vt′s∼ few ×10-4 with large phase, enhancing KL→π0νν̄ to 5×10-10 or even higher. Interestingly, ΔmBd and sin2ΦBd are not much affected, as |Vt′d *Vt′b
Vtd*Vtb|∼0.01. © 2005 The American Physical Society.
Type
journal article