# Production of primordial J/ψ in relativistic p+p and heavy-ion collisions

Production of primordial J/ψ in relativistic p+p and heavy-ion collisions J/ψ observables of p+p collisions at s=200GeV and 2.76 TeV are calculated using the pythia event generator for the production of c and c¯ and the Wigner density formalism. The charm quark momentum from pythia is tuned in such a way that the transverse momentum and rapidity distribution correspond to the fixed-order next-to-leading logarithm calculations and hence to the experimental data for open charm mesons. Using the Wigner density of the charmonium wave function we calculate for each charm quark pair the probability to form a charmonium. As a result, the experimental data on the total J/ψ yield, its rapidity and transverse momentum distribution as well as the fractions of feed-down from excited states of charmonium are reproduced. Applying the same approach to relativistic heavy-ion collisions, we find, if quark gluon plasma (QGP) effects are ignored, a considerable enhancement of the primordial J/ψ's. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

# Production of primordial J/ψ in relativistic p+p and heavy-ion collisions

, Volume 96 (1) – Jul 11, 2017

## Production of primordial J/ψ in relativistic p+p and heavy-ion collisions

Abstract

J/ψ observables of p+p collisions at s=200GeV and 2.76 TeV are calculated using the pythia event generator for the production of c and c¯ and the Wigner density formalism. The charm quark momentum from pythia is tuned in such a way that the transverse momentum and rapidity distribution correspond to the fixed-order next-to-leading logarithm calculations and hence to the experimental data for open charm mesons. Using the Wigner density of the charmonium wave function we calculate for each charm quark pair the probability to form a charmonium. As a result, the experimental data on the total J/ψ yield, its rapidity and transverse momentum distribution as well as the fractions of feed-down from excited states of charmonium are reproduced. Applying the same approach to relativistic heavy-ion collisions, we find, if quark gluon plasma (QGP) effects are ignored, a considerable enhancement of the primordial J/ψ's.

/lp/aps_physical/production-of-primordial-j-in-relativistic-p-p-and-heavy-ion-5jyl9EtHvC
Publisher
The American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.014907
Publisher site
See Article on Publisher Site

### Abstract

J/ψ observables of p+p collisions at s=200GeV and 2.76 TeV are calculated using the pythia event generator for the production of c and c¯ and the Wigner density formalism. The charm quark momentum from pythia is tuned in such a way that the transverse momentum and rapidity distribution correspond to the fixed-order next-to-leading logarithm calculations and hence to the experimental data for open charm mesons. Using the Wigner density of the charmonium wave function we calculate for each charm quark pair the probability to form a charmonium. As a result, the experimental data on the total J/ψ yield, its rapidity and transverse momentum distribution as well as the fractions of feed-down from excited states of charmonium are reproduced. Applying the same approach to relativistic heavy-ion collisions, we find, if quark gluon plasma (QGP) effects are ignored, a considerable enhancement of the primordial J/ψ's.

### Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 11, 2017

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