A measurement of inclusive, prompt, and non-prompt J/psi production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy root s(NN) = 5.02 TeV is presented. The inclusive J/psi mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum p(T) = 0. The inclusive J/psi nuclear modification factor R-pPb is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/psi mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/psi on a statistical basis for p(T) larger than 1.0 GeV/c. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p-Pb run, corresponding to an integrated luminosity L-int = 292 +/- 11 mu b(-1), which is six times larger than the previous publications. The total uncertainty on the P-T-integrated inclusive J/psi and non-prompt J/psi cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and R-pPb are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/psi production cross section, the b (b) over bar production cross section at midrapidity, d sigma(b (b) over bar)/dy, and the total cross section extrapolated over full phase space sigma(b (b) over bar) are derived.

Inclusive, prompt and non-prompt J/ψ production at midrapidity in p-Pb collisions at √sNN = 5.02 TeV

R. Barbera;K. Garg;P. La Rocca;C. Pinto;F. Riggi;A. Rosano;
2022-01-01

Abstract

A measurement of inclusive, prompt, and non-prompt J/psi production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy root s(NN) = 5.02 TeV is presented. The inclusive J/psi mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum p(T) = 0. The inclusive J/psi nuclear modification factor R-pPb is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/psi mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/psi on a statistical basis for p(T) larger than 1.0 GeV/c. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p-Pb run, corresponding to an integrated luminosity L-int = 292 +/- 11 mu b(-1), which is six times larger than the previous publications. The total uncertainty on the P-T-integrated inclusive J/psi and non-prompt J/psi cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and R-pPb are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/psi production cross section, the b (b) over bar production cross section at midrapidity, d sigma(b (b) over bar)/dy, and the total cross section extrapolated over full phase space sigma(b (b) over bar) are derived.
2022
Heavy Ion Experiments
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/549247
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