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Observation of $B^+_c \rightarrow J/\psi D_s^+$ and $B^+_c \rightarrow J/\psi D_s^{*+}$ decays

The decays $B^+_c \rightarrow J/\psi D_s^+$ and $B^+_c \rightarrow J/\psi D_s^{*+}$ are observed for the first time using a dataset, corresponding to an integrated luminosity of 3$fb^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of $\sqrt{s}...

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Detalles Bibliográficos
Autores principales: 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 Jr, A A, Amato, S, Amerio, S, Amhis, Y, Anderlini, L, Anderson, J, Andreassen, R, Appleby, R B, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Bachmann, S, Back, J J, Baesso, C, Balagura, V, Baldini, W, Barlow, R J, 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, Benayoun, M, 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, 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, van den 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, Cattaneo, M, Cauet, Ch, Charles, M, Charpentier, Ph, 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, De Bonis, I, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, J M, De Paula, L, De Silva, W, De Simone, P, Decamp, D, Deckenhoff, M, Del Buono, L, Derkach, D, Deschamps, O, Dettori, F, Di Canto, A, Dijkstra, H, Dogaru, M, Donleavy, S, Dordei, F, Dosil Suárez, A, Dossett, D, Dovbnya, A, Dupertuis, F, Dzhelyadin, R, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, van Eijk, D, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, El Rifai, I, Elsasser, Ch, Elsby, D, Falabella, A, Färber, C, Fardell, G, Farinelli, C, Farry, S, Fave, V, 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, Ph, Gibson, V, Gligorov, V V, Göbel, C, Golubkov, D, Golutvin, A, Gomes, A, Gordon, H, Grabalosa Gándara, M, Graciani Diaz, R, Granado Cardoso, L A, Graugés, E, Graziani, G, Grecu, A, Greening, E, Gregson, S, Grünberg, O, Gui, B, Gushchin, E, Guz, Yu, Gys, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, S C, Hall, S, Hampson, T, Hansmann-Menzemer, S, Harnew, N, 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Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.87.112012
https://dx.doi.org/10.1103/PhysRevD.89.019901
http://cds.cern.ch/record/1558414
Descripción
Sumario:The decays $B^+_c \rightarrow J/\psi D_s^+$ and $B^+_c \rightarrow J/\psi D_s^{*+}$ are observed for the first time using a dataset, corresponding to an integrated luminosity of 3$fb^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of $\sqrt{s}$=7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. The following ratios of branching fractions are measured to be \begin{equation*}BR( B^+_c \rightarrow J/\psi D_s^+)/BR( B^+_c \rightarrow J/\psi \pi+ ) = 2.90 \pm 0.57 \pm 0.24$,\end{equation*} \begin{equation*}BR( B^+_c \rightarrow J/\psi D_s^{*+} ) / BR ( B^+_c \rightarrow J/\psi D_s^+ ) = 2.37 \pm 0.56 \pm 0.10, \end{equation*} where the first uncertainties are statistical and the second systematic. The mass of the $B^+_c$ meson is measured to be \begin{equation*}m_{B^+_c} = 6276.28 \pm 1.44 (stat) \pm 0.36(syst) MeV/c^2,\end{equation*} using the $B^+_c \rightarrow J/\psi D_s^+$ decay mode.