The yields of prompt and non-prompt J/ψ and the fraction of non-prompt J/ψ are measured at midrapidity (|y| < 0.9) via the dielectron decay channel as a function of the midrapidity charged-particle multiplicity (|η| < 0.9) in pp collisions at TeV. The J/ψ yields and the multiplicity are normalized by their average value in inelastic collisions. The multiplicity-dependent yield ratio between prompt J/ψ and D0 is reported. The multiplicity is further divided into three azimuthal regions with respect to the J/ψ momentum: toward the J/ψ emission direction, transverse, or opposite to it. A stronger-than-linear increase of the self-normalized yields is observed for both prompt and non-prompt J/ψ production, with similar trends. This behaviour is also observed in the toward region, while a weaker increase is observed in the transverse and away regions.

Multiplicity dependence of prompt and non-prompt J/ψ production at midrapidity in pp collisions at $$\sqrt{s}=13$$ TeV

Barile, F.
Membro del Collaboration Group
;
Colella, D.
Membro del Collaboration Group
;
Colelli, A.
Membro del Collaboration Group
;
Di Bari, D.
Membro del Collaboration Group
;
Mazzilli, M.
Membro del Collaboration Group
;
Nicassio, N.
Membro del Collaboration Group
;
Volpe, G.
Membro del Collaboration Group
;
2026-01-01

Abstract

The yields of prompt and non-prompt J/ψ and the fraction of non-prompt J/ψ are measured at midrapidity (|y| < 0.9) via the dielectron decay channel as a function of the midrapidity charged-particle multiplicity (|η| < 0.9) in pp collisions at TeV. The J/ψ yields and the multiplicity are normalized by their average value in inelastic collisions. The multiplicity-dependent yield ratio between prompt J/ψ and D0 is reported. The multiplicity is further divided into three azimuthal regions with respect to the J/ψ momentum: toward the J/ψ emission direction, transverse, or opposite to it. A stronger-than-linear increase of the self-normalized yields is observed for both prompt and non-prompt J/ψ production, with similar trends. This behaviour is also observed in the toward region, while a weaker increase is observed in the transverse and away regions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/601012
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