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


International audienceThe 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 $\,\text{ fb }^{-1}$ . The following results are obtained: $\begin{aligned} \mathcal {B}({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= (3.81^{+0.25-0.24} \pm 0.35) \times 10^{-5},\\ \mathcal {A}^{{C\!P}} ({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= -0.045^{+0.056-0.057} \pm 0.008, \end{aligned}$ where the first uncertainties are statistical and the second systematic. Both measurements are the most precise to date

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oai:HAL:hal-01975075v1Last time updated on 1/17/2019

This paper was published in HAL-Polytechnique.

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