Hadronization Scheme Dependence of Long-Range Azimuthal Harmonics in High Energy p+A Reactions

TL;DR

This paper investigates how different hadronization models affect the observed azimuthal harmonic correlations in high-energy proton-nucleus collisions, revealing significant distortions especially at low transverse momenta.

Contribution

It compares three hadronization schemes and quantifies their impact on initial-state gluon correlations and azimuthal harmonics in p+A collisions.

Findings

Hadronization significantly distorts initial azimuthal harmonics.

Distortions are most pronounced at transverse momenta below 2 GeV.

Different models produce varying degrees of harmonic suppression.

Abstract

We compare the distortion effects of three popular final-state hadronization schemes. We show how hadronization modifies the initial-state gluon correlations in high energy p+A collisions. The three models considered are (1) LPH: local parton-hadron duality, (2) CPR: collinear parton- hadron resonance independent fragmentation, and (3) LUND: color string hadronization. The strong initial-state azimuthal asymmetries are generated using the GLVB model for non-abelian gluon bremsstrahlung, assuming a saturation scale Qsat = 2 GeV. Long-range elliptic and triangular harmonics for the final hadron pairs are compared based on the three hadronization schemes. Our analysis shows that the process of hadronization causes major distortions of the partonic azimuthal harmonics for transverse momenta at least up to pT = 3GeV. In particular, they appear to be greatly reduced for pT < 1{\div}2GeV.