The Angantyr model for heavy-ion collisions in Pythia8

A bstract We present a new model for building up complete exclusive hadronic final states in high energy nucleus collisions. It is a direct extrapolation of high energy pp collisions (as described by P ythia ), and thus bridges a large part of the existing gap between heavy ion and high energy physi...

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Bibliographic Details
Published in:The journal of high energy physics 2018-10, Vol.2018 (10), p.1-55, Article 134
Main Authors: Bierlich, Christian, Gustafson, Gösta, Lönnblad, Leif, Shah, Harsh
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Collision dynamics
Elementary Particles
Excitation
Fysik
Heavy Ion Phenomenology
Heavy ions
High energy physics
Ionic collisions
Natural Sciences
Naturvetenskap
Nucleons
Phenomenological Models
Phenomenology
Physical Sciences
Physics
Physics and Astronomy
Projectiles
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Strangeness
String Theory
Subatomic Physics
Subatomär fysik
Transverse momentum
Variation
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Summary:A bstract We present a new model for building up complete exclusive hadronic final states in high energy nucleus collisions. It is a direct extrapolation of high energy pp collisions (as described by P ythia ), and thus bridges a large part of the existing gap between heavy ion and high energy physics phenomenology. The model is inspired by the old Fritiof model and the notion of wounded nucleons. Two essential features are the treatment of multi-parton interactions and diffractive excitation in each NN sub-collision. Diffractive excitation is related to fluctuations in the nucleon partonic sub-structure, and fluctuations in both projectile and target are here included for the first time. The model is able to give a good description of general final-state properties such as multiplicity and transverse momentum distributions, both in p A and AA collisions. The model can therefore serve as a baseline for understanding the non-collective background to observables sensitive to collective behaviour. As P ythia does not include a mechanism to reproduce the collective effects seen in pp collisions, such effects are also not reproduced by the present version of Angantyr. Effects of high string density, shown to be able to reproduce e.g. higher strangeness ratios and the ridge in pp, will be added in future studies.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP10(2018)134