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

• Main Authors: Aaij, R. (Author), Beteta, C. A (Author), Adeva, B. (Author), Adinolfi, M. (Author), Aidala, C. A (Author), Ajaltouni, Z. (Author), Akar, S. (Author), Albicocco, P. (Author), Albrecht, J. (Author), Alessio, F. (Author), Alexander, M. (Author), Albero, A. A (Author), Alkhazov, G. (Author), Alvarez Cartelle, P. (Author), Alves, A. A (Author), Amato, S. (Author), Amerio, S. (Author), Amhis, Y. (Author), An, L. (Author), Anderlini, L. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2021-09-20T17:29:08Z.
• Subjects: Article
• Online Access: Get fulltext

 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.