Treffer: Observation of the rare B 0 s →μ + μ - decay from the combined analysis of CMS and LHCb data

Title:
Observation of the rare B 0 s →μ + μ - decay from the combined analysis of CMS and LHCb data
Authors:
Khachatryan, V, Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Friedl, M, Frühwirth, R, Ghete, VM, Hartl, C, Beluffi, C, Perelygin, V, Shmatov, S, Skatchkov, N, Smirnov, V, Zarubin, A, Golovtsov, V, Ivanov, Y, Kim, V, Levchenko, P, Murzin, V, Bruno, G, Oreshkin, V, Smirnov, I, Sulimov, V, Uvarov, L, Vavilov, S, Vorobyev, A, Andreev, Y, Dermenev, A, Gninenko, S, Castello, R, Golubev, N, Kirsanov, M, Krasnikov, N, Pashenkov, A, Tlisov, D, Toropin, A, Epshteyn, V, Gavrilov, V, Lychkovskaya, N, Popov, V, Caudron, A, Pozdnyakov, I, Safronov, G, Semenov, S, Spiridonov, A, Stolin, V, Vlasov, E, Zhokin, A, Andreev, V, Azarkin, M, Dremin, I, Ceard, L, Kirakosyan, M, Leonidov, A, Mesyats, G, Rusakov, SV, Vinogradov, A, Belyaev, A, Boos, E, Dubinin, M, Dudko, L, Ershov, A, DaSilveira, GG, Gribushin, A, Klyukhin, V, Kodolova, O, Lokhtin, I, Obraztsov, S, Petrushanko, S, Savrin, V, Snigirev, A, Azhgirey, I, Bayshev, I, Delaere, C, Bitioukov, S, Kachanov, V, Kalinin, A, Konstantinov, D, Krychkine, V, Petrov, V, Ryutin, R, Sobol, A, Tourtchanovitch, L, Troshin, S, Du Pree, T, Tyurin, N, Uzunian, A, Volkov, A, Adzic, P, Ekmedzic, M, Milosevic, J, Rekovic, V, Alcaraz Maestre, J, Battilana, C, Calvo, E, Favart, D, Cerrada, M, Chamizo Llatas, M, Colino, N, De La Cruz, B, Delgado Peris, A, Domínguez Vázquez, D, Escalante Del Valle, A, Fernandez Bedoya, C, Fernández Ramos, JP, Flix, J, Forthomme, L, Fouz, MC, Garcia-Abia, P, Gonzalez Lopez, O, Goy Lopez, S, Hernandez, JM, Josa, MI, Navarro De Martino, E, Pérez-Calero Yzquierdo, A, PuertaPelayo, J, QuintarioOlmeda, A, Hörmann, N, Giammanco, A, Redondo, I, Romero, L, Soares, MS, Albajar, C, De Trocóniz, JF, Missiroli, M, Moran, D, Brun, H, Cuevas, J, Fernandez Menendez, J, Hollar, J, Folgueras, S, Gonzalez Caballero, I, Brochero Cifuentes, JA, Cabrillo, IJ, Calderon, A, Duarte Campderros, J, Fernandez, M, Gomez, G, Graziano, A, Lopez Virto, A, Jafari, A, Marco, J, Marco, R, Martinez Rivero, C, Matorras, F, Munoz Sanchez, FJ, Piedra Gomez, J, Rodrigo, T, Rodríguez-Marrero, AY, Ruiz-Jimeno, A, Scodellaro, L, Jez, P, Vila, I, VilarCortabitarte, R, Abbaneo, D, Auffray, E, Auzinger, G, Bachtis, M, Baillon, P, Ball, AH, Barney, D, Benaglia, A, Komm, M, Bendavid, J, Benhabib, L, Benitez, JF, Bernet, C, Bloch, P, Bocci, A, Bonato, A, Bondu, O, Botta, C, Breuker, H, Lemaitre, V, Camporesi, T, Cerminara, G, Colafranceschi, S, D'Alfonso, M, D'Enterria, D, Dabrowski, A, David, A, De Guio, F, De Roeck, A, De Visscher, S, Nuttens, C, Di Marco, E, Dobson, M, Dordevic, M, Dupont-Sagorin, N, Elliott-Peisert, A, Franzoni, G, Funk, W, Gigi, D, Gill, K, Giordano, D, Pagano, D, Girone, M, Glege, F, Guida, R, Gundacker, S, Guthoff, M, Hammer, J, Hansen, M, Harris, P, Hegeman, J, Innocente, V, Perrini, L, Janot, P, Kousouris, K, Krajczar, K, Lecoq, P, Lourenço, C, Magini, N, Malgeri, L, Mannelli, M, Marrouche, J, Masetti, L, Pin, A, Meijers, F, Mersi, S, Meschi, E, Moortgat, F, Morovic, S, Mulders, M, Orsini, 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Publisher Information:
Nature Publishing Group
Publication Year:
2015
Document Type:
Fachzeitschrift article in journal/newspaper
Language:
English
Rights:
undefined
Accession Number:
edsbas.D9458953
Database:
BASE

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The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strangeB meson (B 0 s ) andtheB 0 meson decaying into two oppositely charged muons (μ + and μ - ) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B 0 s →μ + μ - and B 0 s →μ + μ - decays are very rare, with about four of the former occurring for every billion B 0 s mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (CompactMuonSolenoid) andLHCb(LargeHadronCollider beauty) collaborations have performed a joint analysis of the data from proton'proton collisions that they collected in 2011 at a centre-ofmass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B 0 s →μ + μ - decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B 0 s →μ + μ - decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standardmodel. The LHCexperimentswill resume taking data in 2015, recording proton'proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately ...