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.
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. |
JpsiK2[..].pdf [57 KiB] HiDef png [246 KiB] Thumbnail [160 KiB] *.C file |
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JpsiK2[..].pdf [56 KiB] HiDef png [245 KiB] Thumbnail [158 KiB] *.C file |
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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. The mis ID background is small and not visible in these figures. |
Bplus2[..].pdf [66 KiB] HiDef png [415 KiB] Thumbnail [270 KiB] *.C file |
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Bplus2[..].pdf [66 KiB] HiDef png [422 KiB] Thumbnail [272 KiB] *.C file |
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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{ Me V /}c^2}$ and 5310 $ {\mathrm{ Me V /}c^2}$ . The part reco and mis ID backgrounds are small in the given mass region and not visible in these figures. |
rho201[..].pdf [66 KiB] HiDef png [383 KiB] Thumbnail [253 KiB] *.C file |
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rho201[..].pdf [65 KiB] HiDef png [382 KiB] Thumbnail [252 KiB] *.C file |
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Animated gif made out of all figures. |
PAPER-2018-036.gif Thumbnail |
Systematic uncertainties on the branching fraction $\mathcal{B}$ ( $ B ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \rho ^+ $ ). |
Table_1.pdf [58 KiB] HiDef png [108 KiB] Thumbnail [49 KiB] tex code |
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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. |
Table_2.pdf [47 KiB] HiDef png [41 KiB] Thumbnail [18 KiB] tex code |
Created on 23 March 2024.