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Observation of the decay B(c)(+) → B(s)(0)π+.

  • Author(s): 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, AA;
  • Amato, S;
  • Amerio, S;
  • Amhis, Y;
  • Anderlini, L;
  • Anderson, J;
  • Andreassen, R;
  • Andrews, JE;
  • Appleby, RB;
  • Aquines Gutierrez, O;
  • Archilli, F;
  • Artamonov, A;
  • Artuso, M;
  • Aslanides, E;
  • Auriemma, G;
  • Baalouch, M;
  • Bachmann, S;
  • Back, JJ;
  • Baesso, C;
  • Balagura, V;
  • Baldini, W;
  • Barlow, RJ;
  • Barschel, C;
  • Barsuk, S;
  • Barter, W;
  • Bauer, Th;
  • 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;
  • van Beuzekom, M;
  • Bien, A;
  • Bifani, S;
  • Bird, T;
  • Bizzeti, A;
  • Bjørnstad, PM;
  • Blake, T;
  • Blanc, F;
  • Blouw, J;
  • Blusk, S;
  • Bocci, V;
  • Bondar, A;
  • Bondar, N;
  • Bonivento, W;
  • Borghi, S;
  • Borgia, A;
  • Bowcock, TJV;
  • Bowen, E;
  • Bozzi, C;
  • Brambach, T;
  • van den Brand, J;
  • Bressieux, J;
  • Brett, D;
  • Britsch, M;
  • Britton, T;
  • Brook, NH;
  • Brown, H;
  • 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;
  • Cassina, L;
  • Castillo Garcia, L;
  • Cattaneo, M;
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  • Cenci, R;
  • Charles, M;
  • Charpentier, Ph;
  • Chen, P;
  • Cheung, S-F;
  • Chiapolini, N;
  • Chrzaszcz, M;
  • Ciba, K;
  • Cid Vidal, X;
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  • Clarke, PEL;
  • Clemencic, M;
  • Cliff, HV;
  • Closier, J;
  • Coca, C;
  • Coco, V;
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  • Cogneras, E;
  • Collins, P;
  • Comerma-Montells, A;
  • Contu, A;
  • Cook, A;
  • Coombes, M;
  • Coquereau, S;
  • Corti, G;
  • Couturier, B;
  • Cowan, GA;
  • Craik, DC;
  • Cunliffe, S;
  • Currie, R;
  • D'Ambrosio, C;
  • David, P;
  • David, PNY;
  • Davis, A;
  • De Bonis, I;
  • De Bruyn, K;
  • De Capua, S;
  • De Cian, M;
  • De Miranda, JM;
  • De Paula, L;
  • De Silva, W;
  • De Simone, P;
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  • Del Buono, L;
  • Déléage, N;
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  • Deschamps, O;
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  • Ferreira Rodrigues, F;
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  • Filippov, S;
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  • Gersabeck, E;
  • Gersabeck, M;
  • Gershon, T;
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  • Gibson, V;
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  • Hall, S;
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  • Harnew, ST;
  • Harrison, J;
  • Hartmann, T;
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  • Heijne, V;
  • Hennessy, K;
  • Henrard, P;
  • Hernando Morata, JA;
  • van Herwijnen, E;
  • Heß, M;
  • Hicheur, A;
  • Hicks, E;
  • Hill, D;
  • Hoballah, M;
  • Hombach, C;
  • Hulsbergen, W;
  • Hunt, P;
  • Huse, T;
  • Hussain, N;
  • Hutchcroft, D;
  • Hynds, D;
  • Iakovenko, V;
  • Idzik, M;
  • Ilten, P;
  • Jacobsson, R;
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  • Jans, E;
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  • John, M;
  • Johnson, D;
  • Jones, CR;
  • Joram, C;
  • Jost, B;
  • Kaballo, M;
  • Kandybei, S;
  • Kanso, W;
  • Karacson, M;
  • Karbach, TM;
  • Kenyon, IR;
  • Ketel, T;
  • Khanji, B;
  • Kochebina, O;
  • Komarov, I;
  • Koopman, RF;
  • 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;
  • La Thi, VN;
  • Lacarrere, D;
  • Lafferty, G;
  • Lai, A;
  • Lambert, D;
  • Lambert, RW;
  • Lanciotti, E;
  • Lanfranchi, G;
  • Langenbruch, C;
  • Latham, T;
  • Lazzeroni, C;
  • Le Gac, R;
  • van 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, JH;
  • Lopez-March, N;
  • Lu, H;
  • Lucchesi, D;
  • Luisier, J;
  • Luo, H;
  • Lupton, O;
  • Machefert, F;
  • Machikhiliyan, IV;
  • 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, DA;
  • Minard, M-N;
  • Molina Rodriguez, J;
  • Monteil, S;
  • Moran, D;
  • Morawski, P;
  • Mordà, A;
  • Morello, MJ;
  • Mountain, R;
  • Mous, I;
  • Muheim, F;
  • Müller, K;
  • Muresan, R;
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  • Muster, B;
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  • Nakada, T;
  • Nandakumar, R;
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  • Needham, M;
  • Neubert, S;
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  • Nikodem, T;
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  • Oblakowska-Mucha, A;
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  • LHCb Collaboration
  • et al.
Abstract

The result of a search for the decay B(c)(+) → B(s)(0) π+ is presented, using the B(s)(0) → D(s)(-)π+ and B(s)(0) → J/ψ Ø channels. The analysis is based on a data sample of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 1 fb(-1) taken at a center-of-mass energy of 7 TeV, and 2 fb(-1) taken at 8 TeV. The decay B(c)(+) → B(s)(0)π+ is observed with significance in excess of 5 standard deviations independently in both decay channels. The measured product of the ratio of cross sections and branching fraction is [σ(B(c)(+))/σ(B(s)(0))] × B(B(c)(+)→ B(s)(0)π+) = [2.37 ± 0.31 (stat)± 0.11 (syst)(-0.13)(+0.17)(τ(B)(c)(+)))] × 10(-3), in the pseudorapidity range 2<η(B)<5, where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the B(c)(+) lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.

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