Measurement of the relative B-D0 / D*0 / D**0  μ‾ν‾μ branching fractions using B- mesons from B*0s2 decays

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The decay of the narrow resonance $\overline{B}{}_{s2}^{*0}\!\rightarrow B^- K^+$ can be used to determine the $B^-$ momentum in partially reconstructed decays without any assumptions on the decay products of the $B^-$ meson. This technique is employed for the first time to distinguish contributions from $D^0$, $D^{*0}$, and higher-mass charmed states ($D^{**0}$) in semileptonic $B^-$ decays by using the missing-mass distribution. The measurement is performed using a data sample corresponding to an integrated luminosity of 3.0 fb${}^{-1}$ collected with the LHCb detector in $pp$ collisions at center-of-mass energies of 7 and 8 TeV. The resulting branching fractions relative to the inclusive $B^- \!\rightarrow D^0 X \mu^- \overline{\nu}_\mu$ are $f_{D^0} = \mathcal{B}( B^- \rightarrow D^0\mu^-\overline{\nu}_\mu )/\mathcal{B}( B^- \rightarrow D^0 X \mu^- \overline{\nu}_\mu ) = 0.25 \pm 0.06$, $f_{D^{**0}} = \mathcal{B}( B^- \rightarrow ( D^{**0} \rightarrow D^0 X)\mu^-\overline{\nu}_\mu )/\mathcal{B}( B^- \rightarrow D^0 X \mu^- \overline{\nu}_\mu ) = 0.21 \pm 0.07$, with $f_{D^{*0}} = 1 - f_{D^0} - f_{D^{**0}}$ making up the remainder.
Original languageEnglish
Article number092009
JournalPhysical Review D
Issue number9
Publication statusPublished - 31 May 2019


Dive into the research topics of 'Measurement of the relative <i>B</i><sup>-</sup> → <i>D</i><sup>0</sup> / <i>D</i><sup>*0 </sup>/ <i>D</i><sup>**0</sup>  μ‾ν‾<sub>μ</sub> branching fractions using <i>B</i><sup>-</sup> mesons from <i>B</i>‾<sup>*0</sup><sub>s2</sub> decays'. Together they form a unique fingerprint.

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