Observation of B0s – B¯¯¯0s mixing and measurement of mixing frequencies using semileptonic B decays

Aaij, R. et al. (2013) Observation of B0s – B¯¯¯0s mixing and measurement of mixing frequencies using semileptonic B decays. European Physical Journal C, 73(12), p. 2655. (doi: 10.1140/epjc/s10052-013-2655-8)

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Publisher's URL: http://dx.doi.org/10.1140/epjc/s10052-013-2655-8

Abstract

The B0s and B 0 mixing frequencies, Δm s and Δm d , are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in ppcollisions at a centre of mass energy of 7 TeV during 2011. Around 1.8×106 candidate events are selected of the type B0(s)→D−(s)μ+ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain Δms=(17.93±0.22(stat)±0.15(syst)) ps−1,Δmd=(0.503±0.011(stat)±0.013(syst)) ps−1. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for B0s and 13.0 standard deviations for B 0. This is the first observation of B0s mixing to be made using only semileptonic decays.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Pappagallo, Dr Marco and Alexander, Dr Michael and Soler, Professor Paul and Borghi, Dr Silvia and Spradlin, Dr Patrick and Rodrigues, Dr Eduardo and Eklund, Professor Lars
Authors: Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., Andrews, J. E., Andrianala, F., Appleby, R. B., Aquines Gutierrez, O., Archilli, F., Artamonov, A., Artuso, M., Aslanides, E., Auriemma, G., Baalouch, M., Bachmann, S., Back, J. J., Baesso, C., Balagura, V., Baldini, W., Barlow, R. J., Barschel, C., Barsuk, S., Barter, W., Bauer, T., Bay, A., Beddow, J., Bedeschi, F., Bediaga, I., Belogurov, S., Belous, K., Belyaev, I., Ben-Haim, E., Bencivenni, G., Benson, S., Benton, J., Berezhnoy, A., Bernet, R., Bettler, M.-O., Beuzekom, M., Bien, A., Bifani, S., Bird, T., Bizzeti, A., Bjørnstad, P. M., Blake, T., Blanc, F., Blouw, J., Blusk, S., Bocci, V., Bondar, A., Bondar, N., Bonivento, W., Borghi, S., Borgia, A., Bowcock, T. J. V., Bowen, E., Bozzi, C., Brambach, T., Brand, J., Bressieux, J., Brett, D., Britsch, M., Britton, T., Brook, N. H., Brown, H., Burducea, I., Bursche, A., Busetto, G., Buytaert, J., Cadeddu, S., Callot, O., Calvi, M., Calvo Gomez, M., Camboni, A., Campana, P., Campora Perez, D., Carbone, A., Carboni, G., Cardinale, R., Cardini, A., Carranza-Mejia, H., Carson, L., Carvalho Akiba, K., Casse, G., Castillo Garcia, L., Cattaneo, M., Cauet, C., Cenci, R., Charles, M., Charpentier, P., Chen, P., Chiapolini, N., Chrzaszcz, M., Ciba, K., Cid Vidal, X., Ciezarek, G., Clarke, P. E. L., Clemencic, M., Cliff, H. V., Closier, J., Coca, C., Coco, V., Cogan, J., Cogneras, E., Collins, P., Comerma-Montells, A., Contu, A., Cook, A., Coombes, M., Coquereau, S., Corti, G., Couturier, B., Cowan, G. A., Craik, D. C., Cunliffe, S., Currie, R., D’Ambrosio, C., David, P., David, P. N. Y., Davis, A., Bonis, I., Bruyn, K., Capua, S., Cian, M., Miranda, J. M., Paula, L., Silva, W., Simone, P., Decamp, D., Deckenhoff, M., Buono, L., Déléage, N., Derkach, D., Deschamps, O., Dettori, F., Canto, A., Dijkstra, H., Dogaru, M., Donleavy, S., Dordei, F., Dosil Suárez, A., Dossett, D., Dovbnya, A., Dupertuis, F., Durante, P., Dzhelyadin, R., Dziurda, A., Dzyuba, A., Easo, S., Egede, U., Egorychev, V., Eidelman, S., Eijk, D., Eisenhardt, S., Eitschberger, U., Ekelhof, R., Eklund, L., Rifai, I., Elsasser, C., Falabella, A., Färber, C., Fardell, G., Farinelli, C., Farry, S., Ferguson, D., Fernandez Albor, V., Ferreira Rodrigues, F., Ferro-Luzzi, M., Filippov, S., Fiore, M., Fitzpatrick, C., Fontana, M., Fontanelli, F., Forty, R., Francisco, O., Frank, M., Frei, C., Frosini, M., Furcas, S., Furfaro, E., Gallas Torreira, A., Galli, D., Gandelman, M., Gandini, P., Gao, Y., Garofoli, J., Garosi, P., Garra Tico, J., Garrido, L., Gaspar, C., Gauld, R., Gersabeck, E., Gersabeck, M., Gershon, T., Ghez, P., Gibson, V., Giubega, L., Gligorov, V. V., Göbel, C., Golubkov, D., Golutvin, A., Gomes, A., Gorbounov, P., Gordon, H., Gotti, C., Grabalosa Gándara, M., Graciani Diaz, R., Granado Cardoso, L. A., Graugés, E., Graziani, G., Grecu, A., Greening, E., Gregson, S., Griffith, P., Grünberg, O., Gui, B., Gushchin, E., Guz, Y., Gys, T., Hadjivasiliou, C., Haefeli, G., Haen, C., Haines, S. C., Hall, S., Hamilton, B., Hampson, T., Hansmann-Menzemer, S., Harnew, N., Harnew, S. T., Harrison, J., Hartmann, T., He, J., Head, T., Heijne, V., Hennessy, K., Henrard, P., Hernando Morata, J. A., Herwijnen, E., Hess, M., Hicheur, A., Hicks, E., Hill, D., Hoballah, M., Hombach, C., Hopchev, P., Hulsbergen, W., Hunt, P., Huse, T., Hussain, N., Hutchcroft, D., Hynds, D., Iakovenko, V., Idzik, M., Ilten, P., Jacobsson, R., Jaeger, A., Jans, E., Jaton, P., Jawahery, A., Jing, F., John, M., Johnson, D., Jones, C. R., Joram, C., Jost, B., Kaballo, M., Kandybei, S., Kanso, W., Karacson, M., Karbach, T. M., Kenyon, I. R., Ketel, T., Keune, A., Khanji, B., Kochebina, O., Komarov, I., Koopman, R. F., Koppenburg, P., Korolev, M., Kozlinskiy, A., Kravchuk, L., Kreplin, K., Kreps, M., Krocker, G., Krokovny, P., Kruse, F., Kucharczyk, M., Kudryavtsev, V., Kurek, K., Kvaratskheliya, T., Thi, V. N., Lacarrere, D., Lafferty, G., Lai, A., Lambert, D., Lambert, R. W., Lanciotti, E., Lanfranchi, G., Langenbruch, C., Latham, T., Lazzeroni, C., Gac, R., Leerdam, J., Lees, J.-P., Lefèvre, R., Leflat, A., Lefrançois, J., Leo, S., Leroy, O., Lesiak, T., Leverington, B., Li, Y., Li Gioi, L., Liles, M., Lindner, R., Linn, C., Liu, B., Liu, G., Lohn, S., Longstaff, I., Lopes, J. H., Lopez-March, N., Lu, H., Lucchesi, D., Luisier, J., Luo, H., Machefert, F., Machikhiliyan, I. V., Maciuc, F., Maev, O., Malde, S., Manca, G., Mancinelli, G., Maratas, J., Marconi, U., Marino, P., Märki, R., Marks, J., Martellotti, G., Martens, A., Martín Sánchez, A., Martinelli, M., Martinez Santos, D., Martins Tostes, D., Martynov, A., Massafferri, A., Matev, R., Mathe, Z., Matteuzzi, C., Maurice, E., Mazurov, A., McCarthy, J., McNab, A., McNulty, R., McSkelly, B., Meadows, B., Meier, F., Meissner, M., Merk, M., Milanes, D. A., Minard, M.-N., Molina Rodriguez, J., Monteil, S., Moran, D., Morawski, P., Mordà, A., Morello, M. J., Mountain, R., Mous, I., Muheim, F., Müller, K., Muresan, R., Muryn, B., Muster, B., Naik, P., Nakada, T., Nandakumar, R., Nasteva, I., Needham, M., Neubert, S., Neufeld, N., Nguyen, A. D., Nguyen, T. D., Nguyen-Mau, C., Nicol, M., Niess, V., Niet, R., Nikitin, N., Nikodem, T., Nomerotski, A., Novoselov, A., Oblakowska-Mucha, A., Obraztsov, V., Oggero, S., Ogilvy, S., Okhrimenko, O., Oldeman, R., Orlandea, M., Otalora Goicochea, J. M., Owen, P., Oyanguren, A., Pal, B. K., Palano, A., Palczewski, T., Palutan, M., Panman, J., Papanestis, A., Pappagallo, M., Parkes, C., Parkinson, C. J., Passaleva, G., Patel, G. D., Patel, M., Patrick, G. N., Patrignani, C., Pavel-Nicorescu, C., Pazos Alvarez, A., Pellegrino, A., Penso, G., Pepe Altarelli, M., Perazzini, S., Perez Trigo, E., Pérez-Calero Yzquierdo, A., Perret, P., Perrin-Terrin, M., Pescatore, L., Pesen, E., Petridis, K., Petrolini, A., Phan, A., Picatoste Olloqui, E., Pietrzyk, B., Pilař, T., Pinci, D., Playfer, S., Plo Casasus, M., Polci, F., Polok, G., Poluektov, A., Polycarpo, E., Popov, A., Popov, D., Popovici, B., Potterat, C., Powell, A., Prisciandaro, J., Pritchard, A., Prouve, C., Pugatch, V., Puig Navarro, A., Punzi, G., Qian, W., Rademacker, J. H., Rakotomiaramanana, B., Rangel, M. S., Raniuk, I., Rauschmayr, N., Raven, G., Redford, S., Reid, M. M., Reis, A. C., Ricciardi, S., Richards, A., Rinnert, K., Rives Molina, V., Roa Romero, D. A., Robbe, P., Roberts, D. A., Rodrigues, E., Rodriguez Perez, P., Roiser, S., Romanovsky, V., Romero Vidal, A., Rouvinet, J., Ruf, T., Ruffini, F., Ruiz, H., Ruiz Valls, P., Sabatino, G., Saborido Silva, J. J., Sagidova, N., Sail, P., Saitta, B., Salustino Guimaraes, V., Sanmartin Sedes, B., Sannino, M., Santacesaria, R., Santamarina Rios, C., Santovetti, E., Sapunov, M., Sarti, A., Satriano, C., Satta, A., Savrie, M., Savrina, D., Schaack, P., Schiller, M., Schindler, H., Schlupp, M., Schmelling, M., Schmidt, B., Schneider, O., Schopper, A., Schune, M.-H., Schwemmer, R., Sciascia, B., Sciubba, A., Seco, M., Semennikov, A., Senderowska, K., Sepp, I., Serra, N., Serrano, J., Seyfert, P., Shapkin, M., Shapoval, I., Shatalov, P., Shcheglov, Y., Shears, T., Shekhtman, L., Shevchenko, O., Shevchenko, V., Shires, A., Silva Coutinho, R., Sirendi, M., Skwarnicki, T., Smith, N. A., Smith, E., Smith, J., Smith, M., Sokoloff, M. D., Soler, F.J.P., Soomro, F., Souza, D., Souza De Paula, B., Spaan, B., Sparkes, A., Spradlin, P., Stagni, F., Stahl, S., Steinkamp, O., Stevenson, S., Stoica, S., Stone, S., Storaci, B., Straticiuc, M., Straumann, U., Subbiah, V. K., Sun, L., Swientek, S., Syropoulos, V., Szczekowski, M., Szczypka, P., Szumlak, T., T’Jampens, S., Teklishyn, M., Teodorescu, E., Teubert, F., Thomas, C., Thomas, E., Tilburg, J., Tisserand, V., Tobin, M., Tolk, S., Tonelli, D., Topp-Joergensen, S., Torr, N., Tournefier, E., Tourneur, S., Tran, M. T., Tresch, M., Tsaregorodtsev, A., Tsopelas, P., Tuning, N., Ubeda Garcia, M., Ukleja, A., Urner, D., Ustyuzhanin, A., Uwer, U., Vagnoni, V., Valenti, G., Vallier, A., Dijk, M., Vazquez Gomez, R., Vazquez Regueiro, P., Vázquez Sierra, C., Vecchi, S., Velthuis, J. 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College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
Publisher:Springer
ISSN:1434-6044
ISSN (Online):1434-6052
Copyright Holders:Copyright © 2013 CERN for the benefit of the LHCb collaboration
First Published:First published in European Physical Journal C 73(12):2655
Publisher Policy:Reproduced under a Creative Commons License

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