A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon–nucleon centre-of-mass energy sNN=5.02 TeV is presented. The semi-inclusive decay channel of beauty hadrons into J / ψ is considered, where the J / ψ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The b b ¯ production cross section at mid-rapidity, d σ b b ¯ / d y, and the total cross section extrapolated over full phase space, σ b b ¯ , are obtained. This measurement is combined with results on inclusive J / ψ production to determine the prompt J / ψ cross sections. The results in p–Pb collisions are then scaled to expectations from pp collisions at the same centre-of-mass energy to derive the nuclear modification factor R pPb , and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. R pPb is found to be smaller than unity at low p T for both J / ψ coming from beauty hadron decays and prompt J / ψ.

Prompt and non-prompt J/psi production and nuclear modification at mid-rapidity in p-Pb collisions at root s(NN)=5.02 TeV

Cicalo, C.;De Falco, A.;Fionda, F. M.;Usai, G. L.;
2018-01-01

Abstract

A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon–nucleon centre-of-mass energy sNN=5.02 TeV is presented. The semi-inclusive decay channel of beauty hadrons into J / ψ is considered, where the J / ψ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The b b ¯ production cross section at mid-rapidity, d σ b b ¯ / d y, and the total cross section extrapolated over full phase space, σ b b ¯ , are obtained. This measurement is combined with results on inclusive J / ψ production to determine the prompt J / ψ cross sections. The results in p–Pb collisions are then scaled to expectations from pp collisions at the same centre-of-mass energy to derive the nuclear modification factor R pPb , and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. R pPb is found to be smaller than unity at low p T for both J / ψ coming from beauty hadron decays and prompt J / ψ.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/255568
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