The production of J/psi mesons in proton-proton collisions at root s = 7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/psi production is measured as a function of the J/psi transverse momentum p(T) and rapidity y in the fiducial region p(T) is an element of [0; 14] GeV/c and y is an element of [2.0; 4.5]. The differential cross-section and fraction of J/psi from b-hadron decays are also measured in the same p(T) and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb(-1). The measured cross-sections integrated over the fiducial region are 10.52 +/- 0.04 +/- 1.40(-2.20)(+1.64) mu b for prompt J/psi production and 1.14 +/- 0.01 +/- 0.16 mu b for J/psi from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/psi production cross-section is obtained assuming no J/psi polarisation and the third error indicates the acceptance uncertainty due to this assumption. RI Vazquez Regueiro, Pablo/F-7610-2010; Galli, Domenico/A-1606-2012; Murtas, Fabrizio/B-5729-2012; Popovici, Bogdan/B-6521-2012; Muresan, Raluca-Anca/C-3725-2011; Patrignani, Claudia/C-5223-2009; Coca, Cornelia/B-6015-2012; Eklund, Lars/C-7709-2012; Soler, Paul/E-8464-2011; Merkin, Mikhail/D-6809-2012; Leflat, Alexander/D-7284-2012; Petrolini, Alessandro/H-3782-2011; Sarti, Alessio/I-2833-2012

Measurement of J/psi production in pp collisions at root s=7 TeV

Dettori F;Lai A;MANCA, GIULIA;OLDEMAN, RUDOLF GERHARD CHRISTIAAN;SAITTA, BIAGIO;
2011-01-01

Abstract

The production of J/psi mesons in proton-proton collisions at root s = 7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/psi production is measured as a function of the J/psi transverse momentum p(T) and rapidity y in the fiducial region p(T) is an element of [0; 14] GeV/c and y is an element of [2.0; 4.5]. The differential cross-section and fraction of J/psi from b-hadron decays are also measured in the same p(T) and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb(-1). The measured cross-sections integrated over the fiducial region are 10.52 +/- 0.04 +/- 1.40(-2.20)(+1.64) mu b for prompt J/psi production and 1.14 +/- 0.01 +/- 0.16 mu b for J/psi from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/psi production cross-section is obtained assuming no J/psi polarisation and the third error indicates the acceptance uncertainty due to this assumption. RI Vazquez Regueiro, Pablo/F-7610-2010; Galli, Domenico/A-1606-2012; Murtas, Fabrizio/B-5729-2012; Popovici, Bogdan/B-6521-2012; Muresan, Raluca-Anca/C-3725-2011; Patrignani, Claudia/C-5223-2009; Coca, Cornelia/B-6015-2012; Eklund, Lars/C-7709-2012; Soler, Paul/E-8464-2011; Merkin, Mikhail/D-6809-2012; Leflat, Alexander/D-7284-2012; Petrolini, Alessandro/H-3782-2011; Sarti, Alessio/I-2833-2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/31095
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