Theoretical analysis of the leptonic decays B→ℓℓℓ¯νℓ: Identical leptons in the final stateстатья
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Дата последнего поиска статьи во внешних источниках: 13 июля 2022 г.
Аннотация:We study the effects of identical leptons in the final state of the B+→ℓ+ℓ−ℓ+¯νℓ decay. The amplitude of the process is described by the same form factors as the amplitude of the B→ℓℓℓ′¯ν′ℓ decay for nonidentical leptons in the final state. However, the differential distributions are strongly different, as the B+→ℓ+ℓ−ℓ+¯νℓ amplitude contains both the direct (Ma) and exchange (Mb) diagrams. We calculate a number of the differential distributions. 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, ℓ+ℓ+. The good news is that the interference between Ma and Mb, dBab is found to be at the level of less than 1% in all considered differential distributions and therefore can be neglected in the full kinematical region of this decay.