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

• Published in: arXiv.org 2019-06
• Main Authors: collaboration, LHCb, Alves, A A, Andreotti, M, Aslanides, E, Barter, W, Bencivenni, G, Bifani, S, Borisyak, M, Brundu, D, Bursche, A, Byczynski, W, Calvi, M, Campana, P, Chrzaszcz, M, Clarke, P E L, Cogneras, E, Contu, A, Cowan, G A, Delaney, B, H -P Dembinski, Deschamps, O, A Di Canto, Didenko, S, A Dosil Suárez, Durham, J M, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Farley, N, Farry, S, Federici, L, Garrido, L, Gaspar, C, Gerick, D, Ghez, Ph, Gibson, V, Giubega, L, Han, X, Harnew, N, Huang, W, Hutchcroft, D, Inyakin, A, Kudryavtsev, V, Kuonen, A K, Leroy, O, Liang, X, Lindner, R, Lionetto, F, Luppi, E, Maddrell-Mander, S, Marks, J, Martinelli, M, Materok, M, Matev, R, Meaux, C, Merli, A, Moise, R D, Morello, G, Müller, V, Nanut, T, O'Hanlon, D P, Ogilvy, S, Oldeman, R, Pappalardo, L L, Petrolini, A, Pietrzyk, G, Pinzino, J, Piucci, A, M Plo Casasus, M Poli Lener, Pomery, G J, Price, E, Prouve, C, Punzi, G, Redi, F, Reichert, S, Rodrigues, A B, Roiser, S, Saborido Silva, J J, C Sanchez Gras, Santovetti, E, Savrina, D, Schreiner, H F, Serra, N, Simone, S, Skidmore, N, Skwarnicki, T, Stracka, S, Stramaglia, M E, Tsaregorodtsev, A, R Vazquez Gomez, D Vom Bruch, Walsh, J, Wang, M, Websdale, D, Williams, I, Wilson, F F, Q Xu, Zheng, Y
• Format: Article
• Language: English
• Subjects: Asymmetry; Luminosity; Particle collisions
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1812.07041

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\(\mbox{fb}^{-1}\). 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.