An observation of the Lambda(0)(b) -> Psi (2S) Lambda(0) decay and a comparison of its branching fraction with that of the Lambda(0)(b) -> Psi (2S) Lambda(0) decay has been made with the ATLAS detector in proton-proton collisions at root s = 8 TeVat the LHC using an integrated luminosity of 20.6fb(-1). The J/Psi and Psi(2S) mesons are reconstructed in their decays to a muon pair, while the Lambda(0) -> p pi(-) decay is exploited for the Lambda(0) 0baryon reconstruction. The Lambda(0)(b) baryons are reconstructed with transverse momentum p(T)> 10 GeVand pseudorapidity vertical bar eta vertical bar < 2.1. The measured branching ratio of the Lambda(0)(b) -> Psi (2S) Lambda(0) and Lambda(0)(b) -> Psi (2S) Lambda(0) decays is Gamma(Lambda(0)(b) -> Psi (2S) Lambda(0)) / Gamma(Lambda(0)(b) -> Psi (2S) Lambda(0)) = 0.501 +/- 0.033(stat) +/- 0.019(syst), lower than the expectation from the covariant quark model. (C) 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V.

Measurement of the branching ratio Gamma(Lambda(0)(b) -> Psi(2S)Lambda(0))/Gamma(Lambda(0.)(b) -> J/Psi Lambda(0)) with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., Abouzeid, O.s., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.s., Adamczyk, L., Adams, D.l., Adelman, J., Adomeit, S., Adye, T., Affolder, A.a., Agatonovic-Jovin, T., Agricola, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 751:(2015), pp. 63-80. [10.1016/j.physletb.2015.10.009]

Measurement of the branching ratio Gamma(Lambda(0)(b) -> Psi(2S)Lambda(0))/Gamma(Lambda(0.)(b) -> J/Psi Lambda(0)) with the ATLAS detector

Amoroso, S;Artoni, G;Avolio, G;Bacci, C;Bagiacchi, P;Bagnaia, P;Bai, Y;Bauce, M;Beretta, M;Bernard, C;Biglietti, M;Bini, C;Bohm, C;Borroni, S;Brandt, A;Brandt, G;Burdin, S;Calace, N;Calandri, A;Canale, V;Carlino, G;Carvalho, J;Cerutti, F;Chen, X;Chiarella, V;Ciapetti, G;Corradi, M;Costa, MJ;Da Via, C;de Asmundis, R;De Benedetti, A;De Cecco, S;De Pedis, D;De Santo, A;Dell'Acqua, A;Della Pietra, M;Di Ciaccio, L;Di Domenico, A;Di Mattia, A;Di Nardo, R;Diamond, M;Diaz, MA;Doglioni, C;Erdmann, J;Falciano, S;Fang, Y;Forti, A;Franchini, M;Franconi, L;Gao, Y;Gauzzi, P;Ge, P;George, S;Giagu, S;Giannetti, P;Gomes, A;Grancagnolo, S;Gross, E;Gustavino, G;Haas, A;Hamilton, A;Han, L;Hassani, S;Howarth, J;Hsu, C;Hu, D;Ippolito, V;Ji, H;Jones, G;Kado, M;Kagan, M;Kaplan, B;Kawamoto, T;Kimura, N;Kuna, M;Lacava, F;Law, AT;Lewis, A;Li, H;Li, HL;Liberti, B;Lie, K;Liu, L;Liu, M;Lopes, L;Lou, X;Lubatti, HJ;Maiani, C;Maio, A;Mandelli, B;Massa, I;Massa, L;Mazzaferro, L;Mehta, A;Mete, AS;Mir, LM;Monzani, S;Mori, D;Mueller, J;Nemethy, P;Orlando, N;Owen, M;Parodi, F;Poggioli, L;Policicchio, A;Prasad, S;Ragusa, F;Rolli, S;Rubbo, F;Sabato, G;Sakurai, Y;Salamanna, G;Salamon, A;Salvucci, A;Sansoni, A;Santoni, C;Scarcella, M;Schneider, B;Schroeder, C;Schulz, H;Sciolla, G;Shrestha, S;Slater, M;Su, D;Tudorache, A;Unal, G;Urban, J;Vannucci, F;Veneziano, S;Viel, S;Vilucchi, E;Wagner, W;Wang, F;Wang, R;White, S;Williams, S;Wu, M;Xu, D;Ye, J;Young, C;Zanello, L;Zhang, D;Zhang, L;Zhao, X;Zhao, Z;Zhou, L;Zhu, H;Zhu, Y;
2015

Abstract

An observation of the Lambda(0)(b) -> Psi (2S) Lambda(0) decay and a comparison of its branching fraction with that of the Lambda(0)(b) -> Psi (2S) Lambda(0) decay has been made with the ATLAS detector in proton-proton collisions at root s = 8 TeVat the LHC using an integrated luminosity of 20.6fb(-1). The J/Psi and Psi(2S) mesons are reconstructed in their decays to a muon pair, while the Lambda(0) -> p pi(-) decay is exploited for the Lambda(0) 0baryon reconstruction. The Lambda(0)(b) baryons are reconstructed with transverse momentum p(T)> 10 GeVand pseudorapidity vertical bar eta vertical bar < 2.1. The measured branching ratio of the Lambda(0)(b) -> Psi (2S) Lambda(0) and Lambda(0)(b) -> Psi (2S) Lambda(0) decays is Gamma(Lambda(0)(b) -> Psi (2S) Lambda(0)) / Gamma(Lambda(0)(b) -> Psi (2S) Lambda(0)) = 0.501 +/- 0.033(stat) +/- 0.019(syst), lower than the expectation from the covariant quark model. (C) 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V.
2015
b-hadrons; proton proton collisions; lhc
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the branching ratio Gamma(Lambda(0)(b) -> Psi(2S)Lambda(0))/Gamma(Lambda(0.)(b) -> J/Psi Lambda(0)) with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., Abouzeid, O.s., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.s., Adamczyk, L., Adams, D.l., Adelman, J., Adomeit, S., Adye, T., Affolder, A.a., Agatonovic-Jovin, T., Agricola, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 751:(2015), pp. 63-80. [10.1016/j.physletb.2015.10.009]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1655976
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