Exploring Origins for Correlations between Flow Harmonics and Transverse Momentum in Small Collision Systems (Unambiguous Ambiguity)

Abstract

High statistics data sets from experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) with small and large collision species have enabled a wealth of new flow measurements, including the event-by-event correlation between observables. One exciting such observable $\rho (v_n^2,[p_T])$ gauges the correlation between the mean transverse momentum of particles in an event and the various flow coefficients ($v_n$) in the same event [1]. Recently it has been proposed that very low multiplicity events may be sensitive to initial-state glasma correlations [2] rather than flow-related dynamics. We find utilizing the IP-JAZMA framework that the color domain explanation for the glasma results are incomplete. We then explore predictions from PYTHIA-8, and the version for including nuclear collisions called PYTHIA-ANGANTYR, which have only non-flow correlations and the AMPT model which has both non-flow and flow-type correlations. We find that PYTHIA-ANGANTYR has non-flow contributions to $\rho (v_n^2,[p_T])$ in p+O, p+Pb, O+O collisions that are positive at low multiplicity and comparable to the glasma correlations. It is striking that in PYTHIA-8 in p+p collisions there is actually a sign-change from positive to negative $\rho (v_n^2,[p_T])$ as a function of multiplicity. The AMPT results match the experimental data general trends in Pb+Pb collisions at the LHC, except at low multiplicity where AMPT has the opposite sign. In p+Pb collisions, AMPT has the opposite sign from experimental data and we explore this within the context of parton geometry. Predictions for p+O, O+O, and Xe+Xe are also presented.

arXiv comment15 pages, 17 figures, submitted for publication

References in corpus (37)

• A Brief Introduction to PYTHIA 8.1
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Collective flow and viscosity in relativistic heavy-ion collisions
• HIJING 1.0: A Monte Carlo Program for Parton and Particle Production in High Energy Hadronic and Nuclear Collisions
• Heavy Ion Collisions: The Big Picture, and the Big Questions
• Creating small circular, elliptical, and triangular droplets of quark-gluon plasma
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• The Importance of Correlations and Fluctuations on the Initial Source Eccentricity in High-Energy Nucleus-Nucleus Collisions
• Novel Collective Phenomena in High-Energy Proton-Proton and Proton-Nucleus Collisions
• The Angantyr model for Heavy-Ion Collisions in PYTHIA8
• Elliptic and triangular flow in p+Pb and peripheral Pb+Pb collisions from parton scatterings
• Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
• Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models
• Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models
• Exploiting Intrinsic Triangular Geometry in Relativistic He3+Au Collisions to Disentangle Medium Properties
• Glauber modeling of high-energy nuclear collisions at sub-nucleon level
• Revealing long-range multi-particle collectivity in small collision systems via subevent cumulants
• Tracing the origin of azimuthal gluon correlations in the color glass condensate
• Event-by-event mean $p_{\mathrm{T}}$ fluctuations in pp and Pb-Pb collisions at the LHC
• Hierarchy of azimuthal anisotropy harmonics in collisions of small systems from the Color Glass Condensate
• Transverse momentum fluctuations and their correlation with elliptic flow in nuclear collision
• Transverse momentum-flow correlations in relativistic heavy-ion collisions
• The smallest fluid on earth
• Hybrid Color Glass Condensate and hydrodynamic description of the Relativistic Heavy Ion Collider small system scan
• Measurement of flow harmonics correlations with mean transverse momentum in lead-lead and proton-lead collisions at $\sqrt{s_{NN}}=5.02$ TeV with the ATLAS detector
• Observable signatures of initial state momentum anisotropies in nuclear collisions
• Azimuthal Anisotropy Relative to the Participant Plane from AMPT in Central p+Au, d+Au, and ${}^3$He+Au Collisions at $\sqrt{s_{NN}}=200$ GeV
• Systematics of azimuthal anisotropy harmonics in proton-nucleus collisions at the LHC from the Color Glass Condensate
• Correlation between mean transverse momentum and anisotropic flow in heavy-ion collisions
• Exploring the Beam Energy Dependence of Flow-Like Signatures in Small System $d+$Au Collisions
• Correlation coefficient between harmonic and transverse flow in heavy-ion collisions
• Are minimal conditions for collectivity met in e+e- collisions?
• Assessing saturation physics explanations of collectivity in small collision systems with the IP-Jazma model
• Update of a Multi-Phase Transport Model with Modern Parton Distribution Functions and Nuclear Shadowing
• Non-flow effects in correlation between harmonic flow and transverse momentum in nuclear collisions
• A shoving model for collectivity in hadronic collisions
• Gluonic Hot Spot Initial Conditions in Heavy-Ion Collisions

Cited by in corpus (9)

• Correlations between flow and transverse momentum in Xe+Xe and Pb+Pb collisions at the LHC with the ATLAS detector: a probe of the heavy-ion initial state and nuclear deformation
• Impact of nuclear deformation on collective flow observables in relativistic U+U collisions
• Influence of nuclear structure in relativistic heavy-ion collisions
• Model investigations of the correlation between the mean transverse momentum and anisotropic flow in shape-engineered events
• Effect of nuclear structure on particle production in relativistic heavy-ion collisions using the AMPT model
• Model study of the energy dependence of the correlation between anisotropic flow and the mean transverse momentum in Au+Au collisions
• Large-rapidity ridge correlations from Color Glass Condensate
• Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC
• CGC-induced longitudinal ridge in p-Pb collisions