First evidence for the decay Bs -&gt; mu+ mu-
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellan
name: Adametz, A.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amhis, Y.
name: Anderlini, L.
name: Anderson, J.
name: Andreassen, R.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Bachmann, S.
name: Back, J. J.
name: Baesso, C.
name: Baldini, W.
name: Barlow, R. J.
name: Barschel, C.
name: Barsuk, S.
name: Barter, W.
name: Bates, A.
name: Bauer, Th.
name: Bay, A.
name: Beddow, J.
name: Bediaga, I.
name: Belogurov, S.
name: Belous, K.
name: Belyaev, I.
name: Ben-Haim, E.
name: Benayoun, M.
name: Bencivenni, G.
name: Benson, S.
name: Benton, J.
name: Berezhnoy, A.
name: Bernet, R.
name: Bettler, M. -O.
name: van Beuzekom, M.
name: Bien, A.
name: Bifani, S.
name: Bird, T.
name: Bizzeti, A.
name: Bjørnstad, P. M.
name: Blake, T.
name: Blanc, F.
name: Blanks, C.
name: Blouw, J.
name: Blusk, S.
name: Bobrov, A.
name: Bocci, V.
name: Bondar, A.
name: Bondar, N.
name: Bonivento, W.
name: Borghi, S.
name: Borgia, A.
name: Bowcock, T. J. V.
name: Bowen, E.
name: Bozzi, C.
name: Brambach, T.
name: Brand, J. van den
name: Bressieux, J.
name: Brett, D.
name: Britsch, M.
name: Britton, T.
name: Brook, N. H.
name: Brown, H.
name: Büchler-Germann, A.
name: Burducea, I.
name: Bursche, A.
name: Buytaert, J.
name: Cadeddu, S.
name: Callot, O.
name: Calvi, M.
name: Gomez, M. Calvo
name: Camboni, A.
name: Campana, P.
name: Carbone, A.
name: Carboni, G.
name: Cardinale, R.
name: Cardini, A.
name: Carranza-Mejia, H.
name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
name: Cattaneo, M.
name: Cauet, Ch.
name: Charles, M.
name: Charpentier, Ph.
name: Chen, P.
name: Chiapolini, N.
name: Chrzaszcz, M.
name: Ciba, K.
name: Vidal, X. Cid
name: Ciezarek, G.
name: Clarke, P. E. L.
name: Clemencic, M.
name: Cliff, H. V.
name: Closier, J.
name: Coca, C.
name: Coco, V.
name: Cogan, J.
name: Cogneras, E.
name: Collins, P.
name: Comerma-Montells, A.
name: Contu, A.
name: Cook, A.
name: Coombes, M.
name: Corti, G.
name: Couturier, B.
name: Cowan, G. A.
name: Craik, D.
name: Cunliffe, S.
name: Currie, R.
name: D'Ambrosio, C.
name: David, P.
name: David, P. N. Y.
name: De Bonis, I.
name: De Bruyn, K.
name: De Capua, S.
name: De Cian, M.
name: De Miranda, J. M.
name: De Paula, L.
name: De Simone, P.
name: Decamp, D.
name: Deckenhoff, M.
name: Degaudenzi, H.
name: Del Buono, L.
name: Deplano, C.
name: Derkach, D.
name: Deschamps, O.
name: Dettori, F.
name: Di Canto, A.
name: Dickens, J.
name: Dijkstra, H.
name: Batista, P. Diniz
name: Dogaru, M.
name: Bonal, F. Domingo
name: Donleavy, S.
name: Dordei, F.
name: Dornan, P.
name: Suárez, A. Dosil
name: Dossett, D.
name: Dovbnya, A.
name: Dupertuis, F.
name: Dzhelyadin, R.
name: Dziurda, A.
name: Dzyuba, A.
name: Easo, S.
name: Egede, U.
name: Egorychev, V.
name: Eidelman, S.
name: van Eijk, D.
name: Eisenhardt, S.
name: Ekelhof, R.
name: Eklund, L.
name: Rifai, I. El
name: Elsasser, Ch.
name: Elsby, D.
name: Falabella, A.
name: Färber, C.
name: Fardell, G.
name: Farinelli, C.
name: Farry, S.
name: Fave, V.
name: Albor, V. Fernandez
name: Rodrigues, F. Ferreira
name: Ferro-Luzzi, M.
name: Filippov, S.
name: Fitzpatrick, C.
name: Fontana, M.
name: Fontanelli, F.
name: Forty, R.
name: Francisco, O.
name: Frank, M.
name: Frei, C.
name: Frosini, M.
name: Furcas, S.
name: Torreira, A. Gallas
name: Galli, D.
name: Gandelman, M.
name: Gandini, P.
name: Gao, Y.
name: Garofoli, J.
name: Garosi, P.
name: Tico, J. Garra
name: Garrido, L.
name: Gaspar, C.
name: Gauld, R.
name: Gersabeck, E.
name: Gersabeck, M.
name: Gershon, T.
name: Ghez, Ph.
name: Gibson, V.
name: Gligorov, V. V.
name: Göbel, C.
name: Golubkov, D.
name: Golutvin, A.
name: Gomes, A.
name: Gordon, H.
name: Gándara, M. Grabalosa
name: Diaz, R. Graciani
name: Cardoso, L. A. Granado
name: Graugés, E.
name: Graziani, G.
name: Grecu, A.
name: Greening, E.
name: Gregson, S.
name: Grünberg, O.
name: Gui, B.
name: Gushchin, E.
name: Guz, Yu.
name: Gys, T.
name: Hadjivasiliou, C.
name: Haefeli, G.
name: Haen, C.
name: Haines, S. C.
name: Hall, S.
name: Hampson, T.
name: Hansmann-Menzemer, S.
name: Harnew, N.
name: Harnew, S. T.
name: Harrison, J.
name: Harrison, P. F.
name: Hartmann, T.
name: He, J.
name: Heijne, V.
name: Hennessy, K.
name: Henrard, P.
name: Morata, J. A. Hernando
name: van Herwijnen, E.
name: Hicks, E.
name: Hill, D.
name: Hoballah, M.
name: Hombach, C.
name: Hopchev, P.
name: Hulsbergen, W.
name: Hunt, P.
name: Huse, T.
name: Hussain, N.
name: Hutchcroft, D.
name: Hynds, D.
name: Iakovenko, V.
name: Ilten, P.
name: Imong, J.
name: Jacobsson, R.
name: Jaeger, A.
name: Jans, E.
name: Jansen, F.
name: Jaton, P.
name: Jing, F.
name: John, M.
name: Johnson, D.
name: Jones, C. R.
name: Jost, B.
name: Kaballo, M.
name: Kandybei, S.
name: Karacson, M.
name: Karbach, T. M.
name: Kenyon, I. R.
name: Kerzel, U.
name: Ketel, T.
name: Keune, A.
name: Khanji, B.
name: Kochebina, O.
name: Komarov, V.
name: Koopman, R. F.
name: Koppenburg, P.
name: Korolev, M.
name: Kozlinskiy, A.
name: Kravchuk, L.
name: Kreplin, K.
name: Kreps, M.
name: Krocker, G.
name: Krokovny, P.
name: Kruse, F.
name: Kucharczyk, M.
name: Kudryavtsev, V.
name: Kvaratskheliya, T.
name: La Thi, V. N.
name: Lacarrere, D.
name: Lafferty, G.
name: Lai, A.
name: Lambert, D.
name: Lambert, R. W.
name: Lanciotti, E.
name: Lanfranchi, G.
name: Langenbruch, C.
name: Latham, T.
name: Lazzeroni, C.
name: Gac, R. Le
name: van Leerdam, J.
name: Lees, J. -P.
name: Lefèvre, R.
name: Leflat, A.
name: Lefrançois, J.
name: Leroy, O.
name: Lesiak, T.
name: Li, Y.
name: Gioi, L. Li
name: Liles, M.
name: Lindner, R.
name: Linn, C.
name: Liu, B.
name: Liu, G.
name: von Loeben, J.
name: Lopes, J. H.
name: Asamar, E. Lopez
name: Lopez-March, N.
name: Lu, H.
name: Luisier, J.
name: Luo, H.
name: Mac Raighne, A.
name: Machefert, F.
name: Machikhiliyan, I. V.
name: Maciuc, F.
name: Maev, O.
name: Maino, M.
name: Malde, S.
name: Manca, G.
name: Mancinelli, G.
name: Mangiafave, N.
name: Marconi, U.
name: Märki, R.
name: Marks, J.
name: Martellotti, G.
name: Martens, A.
name: Martin, L.
name: Sánchez, A. Martín
name: Martinelli, M.
name: Santos, D. Martinez
name: Tostes, D. Martins
name: Massafferri, A.
name: Matev, R.
name: Mathe, Z.
name: Matteuzzi, C.
name: Matveev, M.
name: Maurice, E.
name: Mazurov, A.
name: McCarthy, J.
name: McNulty, R.
name: Meadows, B.
name: Meissner, M.
name: Merk, M.
name: Milanes, D. A.
name: Minard, M. -N.
name: Rodriguez, J. Molina
name: Monteil, S.
name: Moran, D.
name: Morawski, P.
name: Mountain, R.
name: Mous, I.
name: Muheim, F.
name: Müller, K.
name: Muresan, R.
name: Muryn, B.
name: Muster, B.
name: Naik, P.
name: Nakada, T.
name: Nandakumar, R.
name: Nasteva, I.
name: Needham, M.
name: Neufeld, N.
name: Nguyen, A. D.
name: Nguyen, T. D.
name: Nguyen-Mau, C.
name: Nicol, M.
name: Niess, V.
name: Nikitin, N.
name: Nikodem, T.
name: Nisar, S.
name: Nomerotski, A.
name: Novoselov, A.
name: Oblakowska-Mucha, A.
name: Obraztsov, V.
name: Oggero, S.
name: Ogilvy, S.
name: Okhrimenko, O.
name: Oldeman, R.
name: Orlandea, M.
name: Goicochea, J. M. Otalora
name: Owen, P.
name: Pal, B. K.
name: Palano, A.
name: Palutan, M.
name: Panman, J.
name: Papanestis, A.
name: Pappagallo, M.
name: Parkes, C.
name: Parkinson, C. J.
name: Passaleva, G.
name: Patel, G. D.
name: Patel, M.
name: Patrick, G. N.
name: Patrignani, C.
name: Pavel-Nicorescu, C.
name: Alvarez, A. Pazos
name: Pellegrino, A.
name: Penso, G.
name: Altarelli, M. Pepe
name: Perazzini, S.
name: Perego, D. L.
name: Trigo, E. Perez
name: Yzquierdo, A. Pérez-Calero
name: Perret, P.
name: Perrin-Terrin, M.
name: Pessina, G.
name: Petridis, K.
name: Petrolini, A.
name: Phan, A.
name: Olloqui, E. Picatoste
name: Pietrzyk, B.
name: Pilař, T.
name: Pinci, D.
name: Playfer, S.
name: Casasus, M. Plo
name: Polci, F.
name: Polok, G.
name: Poluektov, A.
name: Polycarpo, E.
name: Popov, D.
name: Popovici, B.
name: Potterat, C.
name: Powell, A.
name: Prisciandaro, J.
name: Pugatch, V.
name: Navarro, A. Puig
name: Qian, W.
name: Rademacker, J. H.
name: Rakotomiaramanana, B.
name: Rangel, M. S.
name: Raniuk, I.
name: Rauschmayr, N.
name: Raven, G.
name: Redford, S.
name: Reid, M. M.
name: Reis, A. C. dos
name: Ricciardi, S.
name: Richards, A.
name: Rinnert, K.
name: Molina, V. Rives
name: Romero, D. A. Roa
name: Robbe, P.
name: Rodrigues, E.
name: Perez, P. Rodriguez
name: Rogers, G. J.
name: Roiser, S.
name: Romanovsky, V.
name: Vidal, A. Romero
name: Rouvinet, J.
name: Ruf, T.
name: Ruiz, H.
name: Sabatino, G.
name: Silva, J. J. Saborido
name: Sagidova, N.
name: Sail, P.
name: Saitta, B.
name: Salzmann, C.
name: Sedes, B. Sanmartin
name: Sannino, M.
name: Santacesaria, R.
name: Rios, C. Santamarina
name: Santovetti, E.
name: Sapunov, M.
name: Sarti, A.
name: Satriano, C.
name: Satta, A.
name: Savrie, M.
name: Schaack, P.
name: Schiller, M.
name: Schindler, H.
name: Schleich, S.
name: Schlupp, M.
name: Schmelling, M.
name: Schmidt, B.
name: Schneider, O.
name: Schopper, A.
name: Schune, M. -H.
name: Schwemmer, R.
name: Sciascia, B.
name: Sciubba, A.
name: Seco, M.
name: Semennikov, A.
name: Senderowska, K.
name: Sepp, I.
name: Serra, N.
name: Serrano, J.
name: Seyfert, P.
name: Shapkin, M.
name: Shapoval, I.
name: Shatalov, P.
name: Shcheglov, Y.
name: Shears, T.
name: Shekhtman, L.
name: Shevchenko, O.
name: Shevchenko, V.
name: Shires, A.
name: Coutinho, R. Silva
name: Skwarnicki, T.
name: Smith, N. A.
name: Smith, E.
name: Smith, M.
name: Sobczak, K.
name: Sokoloff, M. D.
name: Soler, F. J. P.
name: Soomro, F.
name: Souza, D.
name: De Paula, B. Souza
name: Spaan, B.
name: Sparkes, A.
name: Spradlin, P.
name: Stagni, F.
name: Stahl, S.
name: Steinkamp, O.
name: Stoica, S.
name: Stone, S.
name: Storaci, B.
name: Straticiuc, M.
name: Straumann, U.
name: Subbiah, V. K.
name: Swientek, S.
name: Szczekowski, M.
name: Szczypka, P.
name: Szumlak, T.
name: T'Jampens, S.
name: Teklishyn, M.
name: Teodorescu, E.
name: Teubert, F.
name: Thomas, C.
name: Thomas, E.
name: van Tilburg, J.
name: Tisserand, V.
name: Tobin, M.
name: Tolk, S.
name: Tonelli, D.
name: Topp-Joergensen, S.
name: Torr, N.
name: Tournefier, E.
name: Tourneur, S.
name: Tran, M. T.
name: Tresch, M.
name: Tsaregorodtsev, A.
name: Tsopelas, P.
name: Tuning, N.
name: Garcia, M. Ubeda
name: Ukleja, A.
name: Urner, D.
name: Uwer, U.
name: Vagnoni, V.
name: Valenti, G.
name: Gomez, R. Vazquez
name: Regueiro, P. Vazquez
name: Vecchi, S.
name: Velthuis, J. J.
name: Veltri, M.
name: Veneziano, G.
name: Vesterinen, M.
name: Viaud, B.
name: Vieira, D.
name: Vilasis-Cardona, X.
name: Vollhardt, A.
name: Volyanskyy, D.
name: Voong, D.
name: Vorobyev, A.
name: Vorobyev, V.
name: Voß, C.
name: Voss, H.
name: Waldi, R.
name: Wallace, R.
name: Wandernoth, S.
name: Wang, J.
name: Ward, D. R.
name: Watson, N. K.
name: Webber, A. D.
name: Websdale, D.
name: Whitehead, M.
name: Wicht, J.
name: Wiedner, D.
name: Wiggers, L.
name: Wilkinson, G.
name: Williams, M. P.
name: Williams, M.
name: Wilson, F. F.
name: Wishahi, J.
name: Witek, M.
name: Witzeling, W.
name: Wotton, S. A.
name: Wright, S.
name: Wu, S.
name: Wyllie, K.
name: Xie, Y.
name: Xing, F.
name: Xing, Z.
name: Yang, Z.
name: Young, R.
name: Yuan, X.
name: Yushchenko, O.
name: Zangoli, M.
name: Zavertyaev, M.
name: Zhang, F.
name: Zhang, L.
name: Zhang, W. C.
name: Zhang, Y.
name: Zhelezov, A.
name: Zhong, L.
name: Zvyagin, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for the rare decays Bs-&gt;mu+mu- and B0-&gt;mu+mu- is performed using data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1 fb^-1 of proton-proton collisions at sqrt{s} = 8 TeV and 1.0 fb^-1 at sqrt{s}=7 TeV. We observe an excess of Bs -&gt; mu+ mu- candidates with respect to the background expectation. The probability that the background could produce such an excess or larger is 5.3 x 10^-4 corresponding to a signal significance of 3.5 standard deviations. A maximum-likelihood fit gives a branching fraction of BR(Bs -&gt; mu+ mu-) = (3.2^{+1.5}_{-1.2}) x 10^-9, where the statistical uncertainty is 95% of the total uncertainty. This result is in agreement with the Standard Model expectation. The observed number of B0 -&gt; mu+ mu- candidates is consistent with the background expectation, giving an upper limit of BR(B0 -&gt; mu+ mu-) &lt; 9.4 x 10^-10 at 95% confidence level.
description: 3+6 pages, 2 figures, submitted to Phys. Rev. Lett