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Verfasst von:Weber, Steffen Georg [VerfasserIn]   i
 Dubla, Andrea [VerfasserIn]   i
Titel:Elucidating the multiplicity dependence of J/[psi] production in proton-proton collisions with PYTHIA8
Verf.angabe:S.G. Weber, A. Dubla, A. Andronic, A. Morsch
Fussnoten:Im Titel wird "psi" als griechischer Buchstabe dargestellt ; Gesehen am 07.03.2019
Titel Quelle:Enthalten in: The European physical journal / C
Jahr Quelle:2019
Band/Heft Quelle:79(2019,1) Artikel-Nummer 36, 12 Seiten
ISSN Quelle:1434-6052
Abstract:A study of prompt and non-prompt J/ψJ/ψ\mathrm {J}/\psi production as a function of charged-particle multiplicity in inelastic proton-proton (pp) collisions at a centre-of-mass energy of s√s\sqrt{s} = 13 TeV based on calculations using the PYTHIA8 Monte Carlo is reported. Recent experimental data shows an intriguing stronger-than-linear increase of the self-normalized J/ψJ/ψ\mathrm {J}/\psi yield with multiplicity; several models, based on initial or final state effects, have been able to describe the observed behaviour. In this paper, the microscopic reasons for this behaviour, like the role of multiple parton interactions, colour reconnections and auto-correlations are investigated. It is observed that the stronger-than-linear increase and the transverse momentum (pTpTp_\mathrm {T}) dependence, contrary to what is predicted by the other available models, can be attributed to auto-correlation effects only. In absence of auto-correlation effects, the increase of the yield of J/ψJ/ψ\mathrm {J}/\psi with multiplicity - and in general for all hard processes - is weaker than linear for multiplicities exceeding about three times the mean multiplicity. The possibility of disentangling auto-correlation effects from other physical phenomena by measuring the charged-particle multiplicity in different pseudo-rapidity and azimuthal regions relative to the J/ψJ/ψ\mathrm {J}/\psi direction is investigated. In this regard, it is suggested to extend the experimental measurements of J/ψJ/ψ\mathrm {J}/\psi production as a function of the charged-particle multiplicity by determining the multiplicity in several azimuthal regions and in particular in the Transverse region with respect to the direction of the J/ψJ/ψ\mathrm {J}/\psi meson.
DOI:doi:10.1140/epjc/s10052-018-6531-4
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Verlag: http://dx.doi.org/10.1140/epjc/s10052-018-6531-4
 Verlag: https://doi.org/10.1140/epjc/s10052-018-6531-4
 DOI: https://doi.org/10.1140/epjc/s10052-018-6531-4
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1588419800
Verknüpfungen:→ Zeitschrift

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