Hadronization scheme dependence of long-range azimuthal harmonics in high energy p + A reactions

• Main Authors: Angelo Esposito, Miklos Gyulassy
• Format: Article
• Language: English
• Published: Elsevier 2015-07-01
• Series: Physics Letters B
• Subjects: Heavy ion collisions; QCD radiation; Monte Carlo; Hadronization
• Online Access: http://www.sciencedirect.com/science/article/pii/S0370269315004591
• ISSN: 0370-2693; 1873-2445

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=3 GeV. In particular, they appear to be greatly reduced for pT<1÷2 GeV.