The transverse momentum (p(T)) and centrality dependence of the nuclear modification factor R-AA of prompt and non-prompt J/psi, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb-Pb collisions at root s(NN) = 5.02TeV. The measurements are carried out through the e(+)e(-) decay channel at midrapidity (vertical bar y vertical bar < 0.9) in the transverse momentum region 1.5 < p(T) < 10 GeV/c. Both prompt and non-prompt J/psi measurements indicate a significant suppression for p(T) > 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping pT intervals, and cover the kinematic region down to p(T) = 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/psi in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/psi production from recombination of c and (c) over bar quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J/psi. For non-prompt J/psi, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark-gluon plasma is consistent with measurements within uncertainties.

Prompt and non-prompt J/ψ production at midrapidity in Pb–Pb collisions at sqrt(s_NN) = 5.02 TeV

Cortese, P.;Ramello, L.;Sitta, M.;
2024-01-01

Abstract

The transverse momentum (p(T)) and centrality dependence of the nuclear modification factor R-AA of prompt and non-prompt J/psi, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb-Pb collisions at root s(NN) = 5.02TeV. The measurements are carried out through the e(+)e(-) decay channel at midrapidity (vertical bar y vertical bar < 0.9) in the transverse momentum region 1.5 < p(T) < 10 GeV/c. Both prompt and non-prompt J/psi measurements indicate a significant suppression for p(T) > 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping pT intervals, and cover the kinematic region down to p(T) = 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/psi in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/psi production from recombination of c and (c) over bar quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J/psi. For non-prompt J/psi, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark-gluon plasma is consistent with measurements within uncertainties.
File in questo prodotto:
File Dimensione Formato  
JHEP02(2024)066.pdf

file ad accesso aperto

Descrizione: Articolo
Tipologia: Versione Editoriale (PDF)
Licenza: Creative commons
Dimensione 1.15 MB
Formato Adobe PDF
1.15 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11579/183463
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
social impact