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First observation of the decay B(c)+ → J/ψπ(+) π- π+.

  • Author(s): Aaij, R;
  • Abellan Beteta, C;
  • 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;
  • Amhis, Y;
  • Anderson, J;
  • Appleby, RB;
  • Aquines Gutierrez, O;
  • Archilli, F;
  • Artamonov, A;
  • Artuso, M;
  • Aslanides, E;
  • Auriemma, G;
  • Bachmann, S;
  • Back, JJ;
  • Balagura, V;
  • Baldini, W;
  • Barlow, RJ;
  • Barschel, C;
  • Barsuk, S;
  • Barter, W;
  • Bates, A;
  • Bauer, C;
  • Bauer, Th;
  • Bay, A;
  • Bediaga, I;
  • Belogurov, S;
  • Belous, K;
  • Belyaev, I;
  • Ben-Haim, E;
  • Benayoun, M;
  • Bencivenni, G;
  • Benson, S;
  • Benton, J;
  • Bernet, R;
  • Bettler, M-O;
  • van Beuzekom, M;
  • Bien, A;
  • Bifani, S;
  • Bird, T;
  • Bizzeti, A;
  • Bjørnstad, PM;
  • Blake, T;
  • Blanc, F;
  • Blanks, C;
  • Blouw, J;
  • Blusk, S;
  • Bobrov, A;
  • Bocci, V;
  • Bondar, A;
  • Bondar, N;
  • Bonivento, W;
  • Borghi, S;
  • Borgia, A;
  • Bowcock, TJV;
  • Bozzi, C;
  • Brambach, T;
  • van den Brand, J;
  • Bressieux, J;
  • Brett, D;
  • Britsch, M;
  • Britton, T;
  • Brook, NH;
  • Brown, H;
  • Büchler-Germann, A;
  • Burducea, I;
  • Bursche, A;
  • Buytaert, J;
  • Cadeddu, S;
  • Callot, O;
  • Calvi, M;
  • Calvo Gomez, M;
  • Camboni, A;
  • Campana, P;
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  • Carboni, G;
  • Cardinale, R;
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  • Carvalho Akiba, K;
  • Casse, G;
  • Cattaneo, M;
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  • David, PNY;
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  • De Bruyn, K;
  • De Capua, S;
  • De Cian, M;
  • De Miranda, JM;
  • De Paula, L;
  • De Simone, P;
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  • Degaudenzi, H;
  • Del Buono, L;
  • Deplano, C;
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  • Forty, R;
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  • Galli, D;
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  • Garnier, J-C;
  • Garofoli, J;
  • Garra Tico, J;
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  • Granado Cardoso, LA;
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  • Karacson, M;
  • Karbach, TM;
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  • Kenyon, IR;
  • Kerzel, U;
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  • Keune, A;
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  • Kim, YM;
  • Knecht, M;
  • Koopman, RF;
  • Koppenburg, P;
  • Korolev, M;
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  • Kravchuk, L;
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  • Krocker, G;
  • Krokovny, P;
  • Kruse, F;
  • Kruzelecki, K;
  • Kucharczyk, M;
  • Kudryavtsev, V;
  • 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;
  • Leroy, O;
  • Lesiak, T;
  • Li, L;
  • Li Gioi, L;
  • Lieng, M;
  • Liles, M;
  • Lindner, R;
  • Linn, C;
  • Liu, B;
  • Liu, G;
  • von Loeben, J;
  • Lopes, JH;
  • Lopez Asamar, E;
  • Lopez-March, N;
  • Lu, H;
  • Luisier, J;
  • Mac Raighne, A;
  • Machefert, F;
  • Machikhiliyan, IV;
  • Maciuc, F;
  • Maev, O;
  • Magnin, J;
  • Malde, S;
  • Mamunur, RMD;
  • Manca, G;
  • Mancinelli, G;
  • Mangiafave, N;
  • Marconi, U;
  • Märki, R;
  • Marks, J;
  • Martellotti, G;
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  • Martin, L;
  • Martín Sánchez, A;
  • Martinelli, M;
  • Martinez Santos, D;
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  • Matteuzzi, C;
  • Matveev, M;
  • Maurice, E;
  • Maynard, B;
  • Mazurov, A;
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  • McNulty, R;
  • Meissner, M;
  • Merk, M;
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  • Monteil, S;
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  • LHCb Collaboration
  • et al.
Abstract

The decay B(c)(+) → J/ψπ(+) π(-) π(+) is observed for the first time, using 0.8 fb(-1) of pp collisions at sqrt[s] = 7 TeV collected by the LHCb experiment. The ratio of branching fractions B(B(c)(+) → J/ψπ(+) π(-) π(+))/B(B(c)(+)→J/ψπ^{+}) is measured to be 2.41 ± 0.30 ± 0.33, where the first uncertainty is statistical and the second is systematic. The result is in agreement with theoretical predictions.

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