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

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 branchi...

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Veröffentlicht in:	The journal of high energy physics 2012-12, Vol.2012 (12), Article 125
Hauptverfasser:	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:	Artikel
Sprache:	eng
Schlagworte:	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
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Zusammenfassung:	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.).
ISSN:	1029-8479 1126-6708 1029-8479
DOI:	10.1007/JHEP12(2012)125