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Observation of the decay Bc+ -> Bs0 pi+

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arxiv 1308.4544 v2 pith:4HWYXJPC submitted 2013-08-21 hep-ex

Observation of the decay Bc+ -> Bs0 pi+

LHCb collaboration: R. Aaij , B. Adeva , M. Adinolfi , C. Adrover , A. Affolder , Z. Ajaltouni , J. Albrecht , F. Alessio
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M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A.A. Alves Jr S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J.E. Andrews R.B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J.J. Back C. Baesso V. Balagura W. Baldini R.J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P.M. Bj{\o}rnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T.J.V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N.H. Brook H. Brown A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier P. Chen S.-F. Cheung N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P.E.L. Clarke M. Clemencic H.V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G.A. Cowan D.C. Craik S. Cunliffe R. Currie C. D'Ambrosio P. David P.N.Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J.M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. D\'el\'eage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Su\'arez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Falabella C. F\"arber C. Farinelli S. Farry D. Ferguson V. Fernandez Albor F. Ferreira Rodrigues M. Ferro-Luzzi S. Filippov M. Fiore C. Fitzpatrick M. Fontana F. Fontanelli R. Forty O. Francisco M. Frank C. Frei M. Frosini E. Furfaro A. Gallas Torreira D. Galli M. Gandelman P. Gandini Y. Gao J. Garofoli P. Garosi J. Garra Tico L. Garrido C. Gaspar R. Gauld E. Gersabeck M. Gersabeck T. Gershon Ph. Ghez V. Gibson L. Giubega V.V. Gligorov C. G\"obel D. Golubkov A. Golutvin A. Gomes P. Gorbounov H. Gordon M. Grabalosa G\'andara R. Graciani Diaz L.A. Granado Cardoso E. Graug\'es G. Graziani A. Grecu E. Greening S. Gregson P. Griffith O. Gr\"unberg B. Gui E. Gushchin Yu. Guz T. Gys C. Hadjivasiliou G. Haefeli C. Haen S.C. Haines S. Hall B. Hamilton T. Hampson S. Hansmann-Menzemer N. Harnew S.T. Harnew J. Harrison T. Hartmann J. He T. Head V. Heijne K. Hennessy P. Henrard J.A. Hernando Morata E. van Herwijnen M. He\ss A. Hicheur E. Hicks D. Hill M. Hoballah C. Hombach W. Hulsbergen P. Hunt T. Huse N. Hussain D. Hutchcroft D. Hynds V. 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Mart\'in S\'anchez M. Martinelli D. Martinez Santos D. Martins Tostes A. Martynov A. Massafferri R. Matev Z. Mathe C. Matteuzzi E. Maurice A. Mazurov J. McCarthy A. McNab R. McNulty B. McSkelly B. Meadows F. Meier M. Meissner M. Merk D.A. Milanes M.-N. Minard J. Molina Rodriguez S. Monteil D. Moran P. Morawski A. Mord\`a M.J. Morello R. Mountain I. Mous F. Muheim K. M\"uller R. Muresan B. Muryn B. Muster P. Naik T. Nakada R. Nandakumar I. Nasteva M. Needham S. Neubert N. Neufeld A.D. Nguyen T.D. Nguyen C. Nguyen-Mau M. Nicol V. Niess R. Niet N. Nikitin T. Nikodem A. Nomerotski A. Novoselov A. Oblakowska-Mucha V. Obraztsov S. Oggero S. Ogilvy O. Okhrimenko R. Oldeman M. Orlandea J.M. Otalora Goicochea P. Owen A. Oyanguren B.K. Pal A. Palano M. Palutan J. Panman A. Papanestis M. Pappagallo C. Parkes C.J. Parkinson G. Passaleva G.D. Patel M. Patel G.N. Patrick C. Patrignani C. Pavel-Nicorescu A. Pazos Alvarez A. Pearce A. Pellegrino G. Penso M. Pepe Altarelli S. Perazzini E. 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Vallier R. Vazquez Gomez P. Vazquez Regueiro C. V\'azquez Sierra S. Vecchi J.J. Velthuis M. Veltri G. Veneziano M. Vesterinen B. Viaud D. Vieira X. Vilasis-Cardona A. Vollhardt D. Volyanskyy D. Voong A. Vorobyev V. Vorobyev C. Vo\ss H. Voss J.A. de Vries R. Waldi C. Wallace R. Wallace S. Wandernoth J. Wang D.R. Ward N.K. Watson A.D. Webber D. Websdale M. Whitehead J. Wicht J. Wiechczynski D. Wiedner L. Wiggers G. Wilkinson M.P. Williams M. Williams F.F. Wilson J. Wimberley J. Wishahi W. Wislicki M. Witek S.A. Wotton S. Wright S. Wu K. Wyllie Y. Xie Z. Xing Z. Yang X. Yuan O. Yushchenko M. Zangoli M. Zavertyaev F. Zhang L. Zhang W.C. Zhang Y. Zhang A. Zhelezov A. Zhokhov L. Zhong A. Zvyagin
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classification hep-ex
keywords decaychannelsfb-1firstmesonobservationsigmataken
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The result of a search for the decay Bc+ -> Bs0 pi+ is presented, using the Bs0 -> Ds- pi+ and Bs0 -> J/psi Phi 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 Bc+ -> Bs0 pi+ is observed with significance in excess of five standard deviations independently in both decay channels. The measured product of the ratio of cross-sections and branching fraction is sigma(Bc+)/sigma(Bs0) x BR(Bc+ -> Bs0 pi+) = (2.37 \pm 0.31 (stat) \pm 0.11 (syst)^{+0.17}_{-0.13} (tau_Bc)) x 10^-3 in the pseudorapidity range 2 < eta(B) < 5, where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainty on the Bc lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.

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