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<SUP>-</SUP>(ν)over-bar<sub>μ</sub> branching fractions using <i>B</i><SUP>-</SUP> mesons from &lt;(<i>B</i>)over bar&gt;<sub>S2</sub>*<SUP>0</SUP> decays



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S
et al (show 793 more authors) (2019) 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<SUP>-</SUP>(ν)over-bar<sub>μ</sub> branching fractions using <i>B</i><SUP>-</SUP> mesons from &lt;(<i>B</i>)over bar&gt;<sub>S2</sub>*<SUP>0</SUP> decays. PHYSICAL REVIEW D, 99 (9). 092009-.

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Abstract

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.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-024.html . v2 includes minor text changes and two additional subfigures added during journal review
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 20 Jan 2020 16:41
Last Modified: 07 Oct 2023 03:17
DOI: 10.1103/PhysRevD.99.092009
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3071034