Lepton asymmetries in exclusive $b\to s{\ell }^{+}{\ell }^{-}$ decays as a test of the Standard Model

Abstract

We argue that the longitudinal lepton polarization and the forward-backward asymmetries in exclusive $B\to (K,K^{\ast }){\ell }^{+}{\ell }^{-}$ decays are largely unaffected by the theoretical uncertainties in the long-distance contributions both induced by the long-range charming penguins in the ${\ell }^{+}{\ell }^{-}$ channel and those in the meson channels encoded in the meson transition form factors, and are mainly determined by the short-distance Wilson coefficients at the low-energy scale $\mu \simeq m_b$. Thus, the above mentioned asymmetries provide a powerful probe of the Standard Model and its extensions.

revtex, 9 pages, 5 figures

References in corpus (5)

• Rare exclusive semileptonic b -> s transitions in the Standard Model
• Heavy quark expansion and universal form factors in quark model
• Light cone QCD sum rule analysis of B -> K l(+) l(-) decay
• Rare decays B -> (K, K*) (l+ l-, nu bar{nu}) in the quark model
• Re-examination of long distance effects in $b\to s{l}^{+}{l}^{-}$

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• Implication of Z-mediated FCNC on semileptonic decays $B_s\to \varphi l^{+}{l}^{-}$ and $B^{+}\to K^{+}{l}^{+}{l}^{-}$
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