Evidence for the decay $B_c^+ \rightarrow J/\psi 3\pi^+ 2\pi^-

• Published in: The journal of high energy physics 2014-04, Vol.5
• Main Authors: Aaij, R., Amhis, Y., Barsuk, S., Callot, O., He, J., Kochebina, O., Lefrançois, J., Machefert, F., Martin Sanchez, A., Nicol, M., Robbe, P., Schune, M.-H., Teklishyn, M., Vallier, A., Viaud, B., Ben-Haim, E., Benayoun, M., David, P., del Buono, L., Martens, A., Milanes, D.A., Polci, F., Ajaltouni, Ziad Zj, Baalouch, M., Cogneras, E., Deschamps, O., El Rifai, I., Grabalosa Gándara, M., Henrard, Pierre, Hoballah, M., Lefèvre, R., Maratas, J., Monteil, S., Niess, V., Perret, Pascal, Roa Romero, Diego Alejandro, Aslanides, E., Cogan, J., Kanso, W., Legac, R., Leroy, O., Mancinelli, G., Mordà, A., Perrin-Terrin, M., Sapunov, M., Serrano, J., Tsaregorodtsev, A., Decamp, D., Déléage, N., Ghez, Ph, Lees, J.-P., Minard, M.-N., Pietrzyk, B., Qian, W., t'Jampens, S., Tisserand, V., Tournefier, E., Marchand, J.F.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1126-6708; 1029-8479
• DOI: 10.1007/JHEP05(2014)148

Evidence is presented for the decay $B_c+\rightarrow J/\psi 3\pi^+2\pi^-$ using proton-proton collision data, corresponding to an integrated luminosity of 3fb$^{-1}$, collected with the LHCb detector. A signal yield of $32\pm8$ decays is found with a significance of 4.5 standard deviations. The ratio of the branching fraction of the $B_c^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ decay to that of the $B_c^+ \rightarrow J/\psi \pi^+$ decay is measured to be $$ \frac{Br (B_c^+ \rightarrow J/\psi 3\pi^+2\pi^)}{Br (B_c^+ \rightarrow J/\psi \pi^+)} = 1.74\pm0.44\pm0.24, $$ where the first uncertainty is statistical and the second is systematic.