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We study the effects of the identical leptons in the final state of the$B^+\to \ell^+ \ell^- \ell^+\bar\nu_{\ell}$ decay. The amplitude of the processis described by the same form factors as the amplitude of the ${B\to \ell \ell\ell'\bar\nu'_{\ell}}$ decay for non-identical leptons in the final state.However, the differential distributions are strongly different, as the ${B^+\to\ell^+ \ell^- \ell^+\bar\nu_{\ell}}$ amplitude contains both the direct ($M_a$)and the exchange ($M_b$) diagrams. We calculate a number of the differentialdistirbutions. In particular, we propose an interesting observable that can bereadily measured experimentally - the differential distribution over theinvariant mass of the pair of leptons of the same charge, $\ell^+ \ell^+$. Thegood 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 differentaldistributions and therefore can be neglected in the full kinematical region ofthis decay.

Theoretical analysis of the leptonic decays $B\to \ell \ell \ell\bar\nu_{\ell}$: Identical leptons in the final state