Enhanced electroweak penguin amplitude in B-->VV decays.
Enhanced electroweak penguin amplitude in B-->VV decays.
复制标题
DOI：
10.1103/physrevlett.96.141801
复制
发表时间：
2005-12
影响因子：
8.6
通讯作者：
M. Beneke;Johannes Rohrer;Deshan Yang
中科院分区：
文献类型：
--
作者：
M. Beneke;Johannes Rohrer;Deshan Yang
讨论了电磁企鹅效应对B衰变到两个矢量介子的横螺旋度振幅的贡献，相对于标准企鹅振幅，电磁企鹅效应对横螺旋度振幅的贡献增加了2次方m B/λ.这导致独特的偏振签名企鹅主导的衰变模式，如B-->rhoK* 类似的辐射衰变B-->K* γ的偏振效应，并提供了新的机会，探测的幅度和手性的味道改变中性电流耦合到光子。
We discuss a novel electromagnetic penguin contribution to the transverse helicity amplitudes in B decays to two vector mesons, which is enhanced by two powers of mB/Lambda relative to the standard penguin amplitudes. This leads to unique polarization signatures in penguin-dominated decay modes such as B-->rhoK* similar to polarization effects in the radiative decay B-->K*gamma and offers new opportunities to probe the magnitude and chirality of flavor-changing neutral current couplings to photons.