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

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

Abstract The branching fraction and direct $$C\!P$$ C P...

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Bibliographic Details
Main Authors:	Aaij, R., Beteta, C. A, Adeva, B., Adinolfi, M., Aidala, C. A, Ajaltouni, Z., Akar, S., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Albero, A. A, Alkhazov, G., Alvarez Cartelle, P., Alves, A. A, Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L.
Other Authors:	Massachusetts Institute of Technology. Department of Physics
Format:	Article
Language:	English
Published:	Springer Berlin Heidelberg 2021
Online Access:	https://hdl.handle.net/1721.1/131629

Description
Summary:	Abstract The branching fraction and direct $$C\!P$$ C P asymmetry of the decay $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ B + → J / ψ ρ + 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 $$\,\text{ fb }^{-1}$$ fb - 1 . The following results are obtained: $$\begin{aligned} \mathcal {B}({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= (3.81^{+0.25}_{-0.24} \pm 0.35) \times 10^{-5},\\ \mathcal {A}^{{C\!P}} ({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= -0.045^{+0.056}_{-0.057} \pm 0.008, \end{aligned}$$ B ( B + → J / ψ ρ + ) = ( 3 . 81 - 0.24 + 0.25 ± 0.35 ) × 10 - 5 , A C P ( B + → J / ψ ρ + ) = - 0 . 045 - 0.057 + 0.056 ± 0.008 , where the first uncertainties are statistical and the second systematic. Both measurements are the most precise to date.