The Angantyr model for Heavy-Ion Collisions in PYTHIA8

Abstract

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 PYTHIA), 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 pA and AA collisions. The model can therefore serve as a baseline for understanding the non-collective background to observables sensitive to collective behaviour. As PYTHIA 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

57 pages, 26 figures. Updated corresponding to published version

References in corpus (51)

• An Introduction to PYTHIA 8.2
• Event generation with SHERPA 1.1
• Glauber Modeling in High Energy Nuclear Collisions
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• EPOS LHC : test of collective hadronization with LHC data
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: I. QGSJET-II model
• Total cross sections
• Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
• Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV
• Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Rivet user manual
• Single and Double BFKL Pomeron Exchange and a Dipole Picture of High Energy Hard Processes
• Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
• Flow analysis with cumulants: direct calculations
• Evidence for collectivity in pp collisions at the LHC
• Parton-Based Gribov-Regge Theory
• Event-by-Event Simulation of the Three-Dimensional Hydrodynamic Evolution from Flux Tube Initial Conditions in Ultrarelativistic Heavy Ion Collisions
• Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Generic framework for anisotropic flow analyses with multi-particle azimuthal correlations
• Neutron skin of ${}^{208}$Pb from Coherent Pion Photoproduction
• Centrality dependence of particle production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$= 5.02 TeV
• Analysing radial flow features in p-Pb and p-p collisions at several TeV by studying identified particle production in EPOS3
• GLISSANDO: GLauber Initial-State Simulation AND mOre
• Universal behavior of QCD amplitudes at high energy from general tools of statistical physics
• Measurement of charged-particle spectra in Pb+Pb collisions at $\sqrt{s_{\mathsf{NN}}}=2.76$ TeV with the ATLAS detector at the LHC
• Effects of Colour Reconnection on Hadron Flavour Observables
• Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• GLISSANDO 2: GLauber Initial-State Simulation AND mOre..., ver. 2
• Collectivity without plasma in hadronic collisions
• Inclusive and Exclusive observables from dipoles in high energy collisions
• Diffusive scaling and the high-energy limit of deep inelastic scattering in QCD at large N_c
• A Monte Carlo generator of nucleon configurations in complex nuclei including Nucleon-Nucleon correlations
• Color fluctuation effects in proton-nucleus collisions
• Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 5.02 TeV
• Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Diffractive and non-diffractive wounded nucleons and final states in pA collisions
• Elastic scattering and Diffractive dissociation in the light of LHC data
• Evidence for x-dependent proton color fluctuations in pA collisions at the LHC
• Energy Conservation and Saturation in Small-x Evolution
• A comprehensive model of soft interactions in the LHC era
• Small-x Dipole Evolution Beyond the Large-N_c Limit
• Observation of top quark production in proton-nucleus collisions
• Initial state anisotropies and their uncertainties in ultrarelativistic heavy-ion collisions from the Monte Carlo Glauber model
• Neutron skin and centrality classification in high-energy heavy-ion collisions at the LHC
• Revealing nucleon and nucleus flickering in pA collisions at the LHC
• Models of Total, Elastic and Diffractive Cross Sections
• Rope Hadronization and Strange Particle Production
• Neutron-skin effect in direct-photon and charged hadron-production in Pb+Pb collisions at the LHC
• A shoving model for collectivity in hadronic collisions
• Wounded quark emission function at the top RHIC energy

Cited by in corpus (111)

• The ALICE experiment: a journey through QCD
• The Muon Puzzle in cosmic-ray induced air showers and its connection to the Large Hadron Collider
• Heavy quarks and jets as probes of the QGP
• Further developments of a multi-phase transport model for relativistic nuclear collisions
• Multiplicity dependence of $\pi$, K, and p production in pp collisions at $\sqrt{s}=13$ TeV
• The PYTHIA Event Generator: Past, Present and Future
• Event Generators for High-Energy Physics Experiments
• Progress in the Glauber model at collider energies
• Unified description of hadron yield ratios from dynamical core-corona initialization
• Cone size dependence of jet suppression in heavy-ion collisions
• Setting the string shoving picture in a new frame
• Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies
• Transverse momentum and process dependent azimuthal anisotropies in $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV $p$+Pb collisions with the ATLAS detector
• Interplay between core and corona components in high-energy nuclear collisions
• Deep learning jet modifications in heavy-ion collisions
• A Framework for Hadronic Rescattering in pp Collisions
• Identifying groomed jet splittings in heavy-ion collisions
• Microscopic collectivity: The ridge and strangeness enhancement from string-string interactions
• Global fluid fits to identified particle transverse momentum spectra from heavy-ion collisions at the Large Hadron Collider
• Hadron Interactions for Arbitrary Energies and Species, with Applications to Cosmic rays
• Estimation of Impact Parameter and Transverse Spherocity in heavy-ion collisions at the LHC energies using Machine Learning
• QCD Challenges from pp to A-A Collisions
• Hard diffraction in photoproduction with Pythia 8
• Jet quenching in the hadron gas: an exploratory study
• Study of Transverse Spherocity and Azimuthal Anisotropy in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV using A Multi-Phase Transport Model
• Strong constraints on jet quenching in centrality-dependent $p$+Pb collisions at 5.02 TeV from ATLAS
• Double D-meson production in proton-proton and proton-lead collisions at the LHC
• Strangeness enhancement across collision systems without a plasma
• Spin-isospin correlated configurations in complex nuclei and neutron skin effect in W${}^{\pm }$ production in high-energy proton-lead collisions
• Exploring Origins for Correlations between Flow Harmonics and Transverse Momentum in Small Collision Systems (Unambiguous Ambiguity)
• Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions
• Dynamic Jet Charge
• Collective Effects: the viewpoint of HEP MC codes
• $\Sigma (1385{)}^{\pm }$ resonance production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Bayesian approach to long-range correlations and multiplicity fluctuations in nucleus-nucleus collisions
• Heavy flavor angular correlations as a direct probe of the glasma
• Confronting Experimental Data with Heavy-Ion Models: Rivet for Heavy Ions
• Event topology and constituent-quark scaling of elliptic flow in heavy-ion collisions at the Large Hadron Collider using a multiphase transport model
• Isolating perturbative QCD splittings in heavy-ion collisions
• Dipole evolution: perspectives for collectivity and ${\gamma }^{\ast }$A collisions
• The dynamic hadronization of charm quarks in heavy-ion collisions
• Apparent modification of the jet-like yield in proton-proton collisions with large underlying event
• Study of charged particle production at high $p_{\mathrm{T}}$ using event topology in pp, p$-$Pb and Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Multiplicity and rapidity dependence of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• A spatially constrained QCD colour reconnection in pp, pA, and AA collisions in the PYTHIA8/Angantyr model
• Non-equilibrium components in very low transverse momentum region in high-energy nuclear collisions
• Pythia 8 as hadronic interaction model in air shower simulations
• The impact of glasma on heavy flavor azimuthal correlations and spectra
• Toward a description of the centrality dependence of the charge balance function in the HYDJET++ model
• Hanbury Brown--Twiss Interferometry and Collectivity in Small Systems
• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Checking Non-Flow Assumptions and Results via PHENIX Published Correlations in $p$$+$$p$, $p$$+$Au, $d$$+$Au, ${}^3$He$+$Au at $\sqrt{s_{NN}}$ = 200 GeV
• Backward nucleon production by heavy baryonic resonances in proton-nucleus collisions
• Disentangling the development of collective flow in high energy proton proton collisions with a multiphase transport model
• Azimuthal correlations of heavy-flavor hadron decay electrons with charged particles in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Double parton scattering in four-jet production in proton-proton collisions at the LHC
• Correlations of event activity with hard and soft processes in $p$ + Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV at STAR
• Longitudinal correlations from fluctuating strings in Pb-Pb, p-Pb, and p-p collisions
• Forward-backward multiplicity fluctuations in ultra-relativistic nuclear collisions with wounded quarks and fluctuating strings
• Femtoscopic correlations of identical charged pions and kaons in pp collisions at $\sqrt{s}=13$ TeV with event-shape selection
• Fragmentation of Two Repelling Lund Strings
• Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Dynamics of particle production in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using PYTHIA8 Angantyr model
• Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter
• Bayesian Constraints on Pre-Equilibrium Jet Quenching and Predictions for Oxygen Collisions
• Selection bias effects on high-$p_{\mathrm{T}}$ yield and correlation measurements in Oxygen+Oxygen collisions
• Road map for the tuning of hadronic interaction models with accelerator-based and astroparticle data
• Underlying-event properties in pp and p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Charged-particle production as a function of the relative transverse activity classifier in pp, p$-$Pb, and Pb$-$Pb collisions at the LHC
• Probing strangeness hadronization with event-by-event production of multistrange hadrons
• Charged-particle multiplicity distributions over a wide pseudorapidity range in p-Pb collisions at ${\sqrt{\mathbf{s}}}_{\mathrm{NN}}=5.02$ TeV
• Thermodynamical string fragmentation and string density effects in jets
• Model studies of fluctuations in the background for jets in heavy ion collisions
• Transport-based initial conditions for heavy-ion collisions at finite densities
• Bremsstrahlung as a probe of baryon stopping in heavy-ion collisions
• Evolution and fluctuations of chiral chemical potential in heavy ion collisions
• Flattenicity as "centrality" estimator in p-Pb collisions simulated with PYTHIA 8.312 Angantyr
• Measurement of $\varphi (1020)$ meson production in fixed-target $\text{p}$Ne collisions at $\sqrt{s_{NN}}$ = 68.5 GeV
• Effect of $\alpha$-clusters on particle production in O$-$O and p$-$O collisions at LHC energies
• Investigating the most active pp collisions (top 0.1%) using the tools developed by experiments at the LHC
• Sources of multiparticle correlations: a microscopic perspective
• Studies of heavy-ion collisions using PYTHIA Angantyr and UrQMD
• Four-jet double parton scattering production in proton-nucleus collisions within the PYTHIA8 framework
• Baseline study for net-proton number fluctuations at top energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider with the Angantyr model
• PISTA: Posterior Ion STAcking
• Recent Findings from Heavy-Flavor Angular Correlation Measurements in Hadronic Collisions
• Physics-informed neural network (PINN) modeling of charged particle multiplicity using the two-component framework in heavy-ion collisions: A comparison with data-driven neural networks
• Impact of string interactions on the space-time evolution of hadronic vertices
• Exploiting exotic LHC datasets for long-lived new particle searches
• Study of neutron density fluctuation and neutron-proton correlation in Au+Au collisions using PYTHIA8/Angantyr
• Interplay between core and corona from small to large systems
• Azimuthal Correlation Anisotropies in p + p Collisions Simulated by Pythia
• Charm fragmentation fractions and $\mathrm{c}\overline{\mathrm{c}}$ cross section in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Collective effects in O-O and Ne-Ne collisions at $\sqrt{s_{\mathrm{NN}}}$=5.36 TeV from a hybrid approach
• Jet fragmentation via azimuthal angular correlations of heavy flavor decay electrons in pp, p--Pb, and Pb--Pb collisions using PYTHIA8+Angantyr
• Investigating $\Lambda$ baryon production in p-Pb collisions in jets and the underlying event using angular correlations
• Jet modifications from colour rope formation in dense systems of non-parallel strings
• Hadronic resonance production with ALICE at the LHC
• Centrality and Transverse Spherocity dependent study of charged-particle production in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV using PYTHIA8 Angantyr and AMPT models
• Study of angular correlations in Monte Carlo simulations
• Understanding baryon stopping at the BNL Relativistic Heavy Ion Collider top energies
• Studying of final states in p-Au and p-Pb collisions
• Rivet and the analysis preservation in heavy-ion collisions experiments
• How cross section fluctuations affect multiplicity and geometry in pA collisions
• Investigations of $p$+Pb Collisions at Perturbative and Non-Perturbative QCD Scales
• Finite $V_{2\Delta }$ puzzle in low-multiplicity pp collisions from ultra-long-range azimuthal correlations in the string-shoving model
• Hadronic Rescattering in pA and AA Collisions
• Multiplicity-dependent jet modification from di-hadron correlations in pp collisions at $\sqrt{s}=13$ TeV
• The application of Hough transform for fast interaction vertex position estimation in heavy-ion collisions
• Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions
• Centrality Dependence of the Balance Functions for Identified Particles in Pb--Pb Collisions Using Pythia + Angantyr