We report measurements of the inclusive J/ ψ yield and average transverse momentum as a function of charged-particle pseudorapidity density d N ch / d η in p–Pb collisions at √ s NN = 5 . 02 TeV with ALICE at the LHC. The observables are normalised to their corresponding averages in non-single diffractive events. An increase of the normalised J/ ψ yield with normalised d N ch / d η , measured at mid-rapidity, is observed at mid-rapidity and backward rapidity. At forward rapidity, a saturation of the relative yield is observed for high charged-particle multiplicities. The normalised average transverse momentum at forward and backward rapidities increases with multiplicity at low multiplicities and saturates beyond moderate multiplicities. In addition, the forward-to-backward nuclear modification factor ratio is also reported, showing an increasing suppression of J/ ψ production at forward rapidity with respect to backward rapidity for increasing charged-particle multiplicity.

J/psi production as a function of charged-particle pseudorapidity density in p-Pb collisions at sNN=5.02TeV / Adamova, D.; Aggarwal, M.; Rinella, G.; Agnello, M.; Agrawal, N; Ahammed, Z.; Ahmad, N.; Ahn, S. U.; Bufalino, S.; Grosa, F.; Ravasenga, I.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 776:10(2018), pp. 91-104. [10.1016/j.physletb.2017.11.008]

J/psi production as a function of charged-particle pseudorapidity density in p-Pb collisions at sNN=5.02TeV

Agnello, M.;Bufalino, S.;Grosa, F.;Ravasenga, I.
2018

Abstract

We report measurements of the inclusive J/ ψ yield and average transverse momentum as a function of charged-particle pseudorapidity density d N ch / d η in p–Pb collisions at √ s NN = 5 . 02 TeV with ALICE at the LHC. The observables are normalised to their corresponding averages in non-single diffractive events. An increase of the normalised J/ ψ yield with normalised d N ch / d η , measured at mid-rapidity, is observed at mid-rapidity and backward rapidity. At forward rapidity, a saturation of the relative yield is observed for high charged-particle multiplicities. The normalised average transverse momentum at forward and backward rapidities increases with multiplicity at low multiplicities and saturates beyond moderate multiplicities. In addition, the forward-to-backward nuclear modification factor ratio is also reported, showing an increasing suppression of J/ ψ production at forward rapidity with respect to backward rapidity for increasing charged-particle multiplicity.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2711710
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