Study of the production of A(b)(0) and (B)over-bar(0) hadrons in pp collisions and first measurement of the A(b)(0)-> J/psi pK(-) branching fraction

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D.;Nguyen Mau, C.;Niess, V.;Niet, R.;Nikitin, N.;Nikodem, T.;Ninci, D.;Novoselov, A.;O'Hanlon, D. P.;Oblakowska Mucha, A.;Obraztsov, V.;Ogilvy, S.;Okhrimenko, O.;OLDEMAN, RUDOLF GERHARD CHRISTIAAN;Onderwater, C. J. G.;Rodrigues, B. Osorio;Goicochea, J. M. Otalora;Otto, A.;Owen, P.;Oyanguren, A.;Palano, A.;Palombo, F.;Palutan, M.;Panman, J.;Papanestis, A.;Pappagallo, M.;Pappalardo, L. L.;Pappenheimer, C.;Parkes, C.;Passaleval, G.;Pate, G. D.;Pate, M.;Patrignani, C.;Pearce, A.;Pellegrino, A.;Penso, G.;Altarelli, M. Pepe;Perazzini, S.;Perret, P.;Pescatore, L.;Petridis, K.;Petrolini, A.;Petruzzo, M.;Olloqui, E. Picatoste;Pietrzyk, B.;Pilar, T.;Pinci, D.;Pistone, A.;Piuccill, A.;Playfer, S.;Casasus, M. Plo;Poikela, T.;Polci, F.;Poluektov, A.;Polyakov, I.;Polycarpo, E.;Popov, A.;Popovi, D.;Popovici, B.;Potterat, C.;Price, E.;Price, J. D.;Prisciandaro, J.;Pritchard, A.;Prouve, C.;Pugatch, V.;Navarro, A. Puig;Punzi, G.;Qian, W.;Quagliani, R.;Rachwal, B.;Rademacker, J. H.;Rama, M.;Rangel, M. S.;Raniuk, I.;Rauschmayr, N.;Raven, G.;Redi, F.;Reichert, S.;Reid, M. M.;Dos Reis, A. C.;Ricciardi, S.;Richards, S.;Rih, M.;Rinnert, K.;Molina, V. Rives;Robbe, P.;Rodrigues, A. B.;Rodrigues, E.;Lopez, J. A. Rodriguez;Perez, P. Rodriguez;Roiser, S.;Romanovsky, V.;Vida, A. Romero;Ronayne, J. W.;Rotondo, M.;Rouvinet, J.;Ruf, T.;Vas, P. Ruiz;Silva, J. J. Saborido;Sagidova, N.;Sail, P.;SAITTA, BIAGIO;Guimaraes, V. Salustino;Mayordomo, C. Sanchez;Sedes, B. Sanmartin;Santacesaria, R.;Rios, C. Santamarina;Santimaria, M.;Santovetti, E.;Sarti, A.;Satriano, C.;Satta, A.;Saunders, D. M.;Savrina, D.;Schiller, M.;Schindler, H.;Schlupp, M.;Schmellingl, M.;Schmelzer, T.;Schmidt, B.;Schneider, O.;Schopper, A.;Schubiger, M.;Schune, M. H.;Schwemmer, R.;Sciascia, B.;Sciubba, A.;Semennikov, A.;Serra, N.;Serrano, J.;Sestini, L.;Seyfert, P.;Shapkin, M.;Shapoval, I.;Shcheglov, Y.;Shears, T.;Shekhtman, L.;Shevchenkom, V.;Shires, A.;Siddi, B. G.;Coutinho, R. Silva;De Oliveira, L. Silva;Simi, G.;Sirendi, M.;Skidmore, N.;Skwarnicki, T.;Smith, E.;Smith, E.;Smith, I. T.;Smith, J.;Smithm, M.;Snoek, H.;Sokoloff, M. D.;Soler, F. J. P.;Soomro, F.;Souza, D.;De Paula, B. Souza;Spaan, B.;Spradlin, P.;Sridharan, S.;Stagni, F.;Stahl, M.;Stah, S.;Stefkova, S.;Steinkamp, O.;Stenyakin, O.;Stevenson, S.;Stoica, S.;Stone, S.;Storaci, B.;Stracka, S.;Straticiuc, M.;Straumann, U.;Sun, L.;Sutcliffe, W.;Swientek, K.;Swientek, S.;Syropoulos, V.;Szczekowski, M.;Szczypka, P.;Szumlak, T.;T'Jampens, S.;Tayduganov, A.;Tekampe, T.;Teklishyn, M.;Tellarini, G.;Teubert, F.;Thomas, C.;Thomas, E.;Van Tilburg, J.;Tisserand, V.;Tobin, M.;Todd, J.;Tolk, S.;Tomassetti, L.;Tonelli, D.;Topp Joergensen, S.;Torr, N.;Tournefier, E.;Tourneur, S.;Trabelsi, K.;Tran, M. T.;Tresch, M.;Trisovic, A.;Tsaregorodtsev, A.;Tsopelas, P.;Tuning, N.;Ukleja, A.;Ustyuzhanin, A.;Uwer, U.;VACCA, CLAUDIA;Vagnoni, V.;Valenti, G.;Vallier, A.;Gomez, R. Vazquez;Regueiro, P. Vazquez;Sierra, C. Vazquez;Vecchi, S.;Velthuis, J. J.;Vetri, M.;Veneziano, G.;Vesterinen, M.;Viaud, B.;Vieira, D.;Diaz, M. Vieites;Vilasis Cardona, X.;Volkov, V.;Vollhardt, A.;Volyanskyy, D.;Voong, D.;Vorobyev, A.;Vorobyev, V.;Voss, C.;De Vries, J. A.;Waldi, R.;Wallace, C.;Wallace, R.;Walsh, J.;Wandernoth, S.;Wang, J.;Ward, D. R.;Watson, N. K.;Websdale, D.;Weiden, A.;Whitehead, M.;Wilkinson, G.;Wilkinson, M.;Williams, M.;Williams, M. P.;Williams, M.;Williams, T.;Wilson, F. F.;Wimberley, J.;Wishahi, J.;Wislicki, W.;Witek, M.;Wormser, G.;Wotton, S. A.;Wright, S.;Wyllie, K.;Xie, Y.;Xu, Z.;Yang, Z.;Yu, J.;Yuan, X.;Yushchenko, O.;Zangoli, M.;Zavertyaevth, M.;Zhang, L.;Zhang, Y.;Zhelezovil, A.;Zhokhov, A.;Zhong, L.;Zucchelli, S.

2016-01-01

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Abstract

The product of the Λ0 b(B0) differential production cross-section and the branching fraction of the decay Λ0 bJ= pK.. (B0!J= K Λ (892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT >20 GeV=c and 2:0>y>4:5. The measurements use a data sample corresponding to an integrated luminosity of 3fb..1 collected by the LHCb detector in pp collisions at centre-of-mass energies ps = 7 TeV in 2011 and ps = 8 TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛ0 b =fd, the branching fraction of the decay Λ0 b!J= pK.. is measured to be B(Λ0 bJ= pK..)=(3:17±0:04±0:07±0:34+0:45 ..0:28 )10..4 ; where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B0J= K Λ (892)0, and the fourth is due to the knowledge of fΛ0 b =fd. The sum of the asymmetries in the production and decay between Λ0 b and Λ 0 b is also measured as a function of pT and y. The previously published branching fraction of Λ0 b ! J= p.., relative to that of Λ0 b ! J= pK.., is updated. The branching fractions of Λ0 b!P+ c (!J= p)K.. are determined.