论文标题
Leptonic衰变的理论分析$ b \ to \ ell \ ell \ ell \ ell \barν_ {\ ell} $：最终状态处的相同的lepton
Theoretical analysis of the leptonic decays $B\to \ell \ell \ell\barν_{\ell}$: Identical leptons in the final state
论文作者
论文摘要
我们在$ b^+\ to \ ell^+\ ell^ - \ ell^+\barν_{\ ell} $ decay的最终状态下研究相同的瘦素的效果。该过程的幅度用与$ {b \ to \ ell \ ell \ ell \ ell \ ell'\barν'_ _ {\ ell}} $衰减的幅度相同的形式描述。但是，差异分布截然不同，因为$ {b^+\ to \ ell^+\ ell^ - \ ell^+\barν_ {\ ell}} $振幅同时包含直接（$ m_a $）和Exchange（$ m_b $）图。我们计算许多差分偏移。特别是，我们提出了一个有趣的可观察到的可观察到的，可以很容易地实验测量 - 相同电荷对的lept子的不变质量分布，$ \ ell^+ \ ell^el^+ $。好消息是，发现$ m_a $和$ m_b $，$ d {\ cal b} _ {ab} $之间的干扰在所有被认为的不同分布中的水平小于1 \％的水平，因此可以在该衰变的整个运动区域中忽略。
We study the effects of the identical leptons in the final state of the $B^+\to \ell^+ \ell^- \ell^+\barν_{\ell}$ decay. The amplitude of the process is described by the same form factors as the amplitude of the ${B\to \ell \ell \ell'\barν'_{\ell}}$ decay for non-identical leptons in the final state. However, the differential distributions are strongly different, as the ${B^+\to \ell^+ \ell^- \ell^+\barν_{\ell}}$ amplitude contains both the direct ($M_a$) and the exchange ($M_b$) diagrams. We calculate a number of the differential distirbutions. In particular, we propose an interesting observable that can be readily measured experimentally - the differential distribution over the invariant mass of the pair of leptons of the same charge, $\ell^+ \ell^+$. The good news is that the interference between $M_a$ and $M_b$, $d{\cal B}_{ab}$, is found to be at the level of less than 1\% in all considered differental distributions and therefore can be neglected in the full kinematical region of this decay.
