Electroweak Penguin Contributions in $B^{-}(\overline{B_d^0})\to PP$ and $PV$ decays Beyond Leading Logarithms

Abstract

Using the next-to-leading order low energy effective Hamiltonian for $|\Delta B|=1$, $\Delta C=\Delta U=0$ transitions, the contributions of electroweak penguin operators in $B^{-}(\overline{B_d^0})\to PP$ and $PV$ decays are estimated in the standard model. We find that, for some channels, the electroweak penguin effects can enhance or reduce the QCD penguin and/or tree level contributions by at least $30\%$, and can even play dominant role.

12 pages, latex

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