The production of J/psi pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb(-1) collected with the LHCb detector. The production cross-section for pairs with both J/psi in the rapidity range 2 < y(J/psi) < 4.5 and transverse momentum p(T)(J/psi) < 10 GeV/c is sigma(J/psi J/psi) = 5.1 +/- 1.0 +/- 1.1 nb, where the first uncertainty is statistical and the second systematic. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved. RI Popovici, Bogdan/B-6521-2012; Muresan, Raluca-Anca/C-3725-2011; Coca, Cornelia/B-6015-2012; Galli, Domenico/A-1606-2012; Eklund, Lars/C-7709-2012; Carbone, Angelo/C-8289-2012; Soler, Paul/E-8464-2011; Leflat, Alexander/D-7284-2012; Petrolini, Alessandro/H-3782-2011; Sarti, Alessio/I-2833-2012; de Paula, Leandro/I-9278-2012; manca, giulia/I-9264-2012; Patrignani, Claudia/C-5223-2009; Marconi, Umberto/J-2263-2012; de Simone, Patrizia/J-3549-2012; Cardini, Alessandro/J-5736-2012; Teodorescu, Eliza/K-3044-2012

Observation of J/psi-pair production in pp collisions at root s=7 TeV

Dettori F;Lai A;MANCA, GIULIA;OLDEMAN, RUDOLF GERHARD CHRISTIAAN;SAITTA, BIAGIO;
2012-01-01

Abstract

The production of J/psi pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb(-1) collected with the LHCb detector. The production cross-section for pairs with both J/psi in the rapidity range 2 < y(J/psi) < 4.5 and transverse momentum p(T)(J/psi) < 10 GeV/c is sigma(J/psi J/psi) = 5.1 +/- 1.0 +/- 1.1 nb, where the first uncertainty is statistical and the second systematic. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved. RI Popovici, Bogdan/B-6521-2012; Muresan, Raluca-Anca/C-3725-2011; Coca, Cornelia/B-6015-2012; Galli, Domenico/A-1606-2012; Eklund, Lars/C-7709-2012; Carbone, Angelo/C-8289-2012; Soler, Paul/E-8464-2011; Leflat, Alexander/D-7284-2012; Petrolini, Alessandro/H-3782-2011; Sarti, Alessio/I-2833-2012; de Paula, Leandro/I-9278-2012; manca, giulia/I-9264-2012; Patrignani, Claudia/C-5223-2009; Marconi, Umberto/J-2263-2012; de Simone, Patrizia/J-3549-2012; Cardini, Alessandro/J-5736-2012; Teodorescu, Eliza/K-3044-2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/81278
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