Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review C Année : 2023

Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter

Résumé

We present a Bayesian method to reconstruct event-by-event multiplicity fluctuations and rapidity correlations in p+Pb collisions at zero impact parameter from minimum-bias data, without assuming any model of the collision dynamics. We test it on Monte Carlo simulations with the Angantyr model, then apply it to ATLAS data on the distribution of charged multiplicity and transverse energy in p+Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Fluctuations in $b=0$ collisions are quantum fluctuations which originate mostly from the proton wave function, and therefore have the potential to constrain the subnucleonic structure of the proton. The Angantyr model is found to overestimate fluctuations. In addition, we find that as the rapidity increases (towards the Pb-going side), not only the multiplicity density increases, but also its relative event-by-event fluctuation. This counter-intuitive phenomenon is also observed in simulations with Angantyr, and with the QCD dipole model, where its origin can be traced back to the branching process through which gluons are produced.
Fichier principal
Vignette du fichier
2208.12175.pdf (4.99 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03773538 , version 1 (26-02-2024)

Identifiants

Citer

Mathis Pepin, Peter Christiansen, Stéphane Munier, Jean-Yves Ollitrault. Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter. Physical Review C, 2023, 107 (2), pp.024902. ⟨10.1103/PhysRevC.107.024902⟩. ⟨hal-03773538⟩
19 Consultations
2 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More