The production of J/psi is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies root s = 5.02 and 13 TeV. The J/psi mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dN(ch)/d eta) is measured at midrapidity (vertical bar eta vertical bar < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dN(ch)/d eta/< dN(ch)/d eta >), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (< p(T)>) of J/psi in pp collisions exhibits an increasing trend as a function of dN(ch)/d eta/< dN(ch)/d eta > showing a saturation towards high charged-particle multiplicities.

Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at √s=5.02 and 13 TeV

D. Colella
Membro del Collaboration Group
;
D. Di Bari
Membro del Collaboration Group
;
M. Mazzilli;A. Palasciano
Membro del Collaboration Group
;
G. Volpe
Membro del Collaboration Group
;
2022-01-01

Abstract

The production of J/psi is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies root s = 5.02 and 13 TeV. The J/psi mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dN(ch)/d eta) is measured at midrapidity (vertical bar eta vertical bar < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dN(ch)/d eta/< dN(ch)/d eta >), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (< p(T)>) of J/psi in pp collisions exhibits an increasing trend as a function of dN(ch)/d eta/< dN(ch)/d eta > showing a saturation towards high charged-particle multiplicities.
File in questo prodotto:
File Dimensione Formato  
JHEP06(2022)015.pdf

accesso aperto

Tipologia: Documento in Versione Editoriale
Licenza: Creative commons
Dimensione 669.81 kB
Formato Adobe PDF
669.81 kB 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/11586/431145
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 8
social impact