First observation of the decay B+ → π+μ+μ

• Published in: The journal of high energy physics Vol. 2012; no. 12
• Main Authors: Adametz, A., Adrover, C., Ajaltouni, Z., Alessio, F., Anderlini, L., Gutierrez, O. Aquines, Aslanides, E., Baldini, W., Benson, S., Berezhnoy, A., Blusk, S., Bocci, V., Bonivento, W., Borghi, S., Brambach, T., Britsch, M., Brown, H., Cardinale, R., Cattaneo, M., Ciezarek, G., Corti, G., Craik, D., D’Ambrosio, C., Dovbnya, A., Dziurda, A., Ekelhof, R., Filippov, S., Fontana, M., Forty, R., Frosini, M., Galli, D., Gaspar, C., Ghez, Ph, Graziani, G., Hansmann-Menzemer, S., Harrison, J., Morata, J. A. Hernando, Hopchev, P., Hussain, N., Khanji, B., Koppenburg, P., Krocker, G., Lambert, D., Latham, T., Lesiak, T., Liles, M., von Loeben, J., Lopes, J. H., Raighne, A. Mac, Machefert, F., Machikhiliyan, I. V., Malde, S., Martinelli, M., Massafferri, A., McCarthy, J., McNulty, R., Mountain, R., Müller, K., Muryn, B., Mylroie-Smith, J., Nakada, T., Neufeld, N., Okhrimenko, O., Penso, G., Altarelli, M. Pepe, Perret, P., Valls, B. Pie, Playfer, S., Raniuk, I., Rauschmayr, N., Rinnert, K., Robbe, P., Vidal, A. Romero, Rosello, M., Sabatino, G., Silva, J. J. Saborido, Sagidova, N., Santacesaria, R., Santovetti, E., Schmidt, B., Schwemmer, R., Sepp, I., Seyfert, P., Soler, F. J. P., Szczekowski, M., Thomas, E., Tobin, M., Topp-Joergensen, S., Torr, N., Garcia, M. Ubeda, Voong, D., Voß, C., Wandernoth, S., Whitehead, M., Wishahi, J., Yang, Z., Yuan, X., Yushchenko, O., Zangoli, M., Zvyagin, A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.12.2012; Springer Nature B.V; Springer Verlag
• Subjects: Classical and Quantum Gravitation; Decay; Detectors de radiació; Elementary Particles; Física nuclear; Hadrons; High energy physics; Luminosity; Nuclear counters; Nuclear physics; Particles (Nuclear physics); Partícules (Física nuclear); Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Relativity Theory; String Theory; Teoria quàntica de camps; Hadron-Hadron Scattering
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP12(2012)125

A bstract A discovery of the rare decay B + → π + μ + μ − is presented. This decay is observed for the first time, with 5.2 σ significance. The observation is made using pp collision data, corresponding to an integrated luminosity of 1.0 fb −1 , collected with the LHCb detector. The measured branching fraction is (2.3 ± 0.6 (stat.) ± 0.1 (syst.))×10 −8 , and the ratio of the B + → π + μ + μ − and B + → K + μ + μ − branching fractions is measured to be 0.053 ± 0.014 (stat.) ± 0.001 (syst.).