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Measurement of the branching fraction and $C\!P$ asymmetry in $B^{+}\rightarrow J/\psi \rho^{+}$ decays

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Abstract

The branching fraction and direct $C\!P$ asymmetry of the decay $B^{+}\rightarrow J/\psi \rho^{+}$ are measured using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to a total integrated luminosity of 3$ fb^{-1}$. The following results are obtained: \begin{align} \mathcal{B}(B^{+}\rightarrow J/\psi \rho^{+}) &= (3.81 ^{+0.25}_{-0.24} \pm 0.35) \times 10^{-5}, \nonumber \\ \mathcal{A}^{C\!P} (B^{+}\rightarrow J/\psi \rho^{+}) &= -0.045^{+0.056}_{-0.057} \pm 0.008, \nonumber \end{align} where the first uncertainties are statistical and the second systematic. Both measurements are the most precise to date.

Figures and captions

Leading-order Feynman diagrams for the (left) tree and (right) penguin amplitudes contributing to the decay $ B ^+ \!\rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \rho ^+ $ .

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The $\mu ^+$ $\mu ^-$ $ K ^+$ invariant mass distributions for the (left) 2011 and (right) 2012 data sets with down magnet polarity.

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The $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ $\pi ^+$ $\pi ^0$ invariant mass distributions for the (left) 2011 and (right) 2012 data sets. In the legend, "non res" stands for non-resonant background, "part reco" for partially reconstructed background and "mis ID" for background involving a misidentification of a kaon.

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The $\pi ^+$ $\gamma $ $\gamma $ invariant mass distributions for the (left) 2011 and (right) 2012 data sets for $m_{ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi ^+ \pi ^0 }$ between 5250 $ {\mathrm{\,MeV\!/}c^2}$ and 5310 $ {\mathrm{\,MeV\!/}c^2}$ .

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Tables and captions

Systematic uncertainties on the branching fraction $\mathcal{B}$ ( $ B ^+ \!\rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \rho ^+ $ ).

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Systematic uncertainties on the direct $ C\!P$ asymmetry of $ B ^+ \!\rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \rho ^+ $ decays.

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Supplementary Material [file]

Supplementary material full pdf

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This ZIP file contains supplemetary material for the publication LHCb-PAPER-2018-036. The files are: supplementary.pdf : An overview of the extra figures *.pdf, *.png, *.eps, *.C : The figures in various formats

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Created on 18 January 2019.Citation count from INSPIRE on 22 January 2019.