Electroweak Penguin and Leptophobic $Z^{\prime }$ model

Abstract

We consider the leptophobic $Z^{\prime }$ model which can appear naturally in the flipped SU(5) or string-inspired $E_6$ models. This model can be constrained by measurements of the $B\to M\nu \bar{\nu }$ decays and $\Delta m_s$. We find that although the latter give much stronger constraints on the coupling than the former, they are complementary to each other.

Comments: Talk given at Summer Institute 2006, APCTP Pohang Korea, August 23-30, 2006, 5 pages, 4 figures, LateX