A Method to Constrain Preferential Emission and Spectator Dynamics in Heavy-Ion Collisions

Abstract

Longitudinal particle production in heavy-ion collisions is influenced both by preferential emission from participating nucleons and by the breakup of spectator matter, yet quantifying these effects experimentally remains challenging. We introduce a Pearson correlation between spectator and charged-particle forward-backward asymmetries as an experimental probe of these phenomena. Using Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV simulated with A Multi-Phase Transport (AMPT) model, we validate that this correlator provides a robust, pseudorapidity-differential measure of the influence of preferential emission on the longitudinal structure of particle production. We further demonstrate that the correlation strength is sensitive to fluctuations in spectator number, which in experiments arise from evaporation and fragmentation of the spectator remnants. The proposed observable therefore offers a data-driven handle for constraining models of preferential emission and spectator breakup, thereby improving our understanding of the mechanisms that shape the final-state longitudinal distributions in heavy-ion collisions.

11 pages, 9 figures

References in corpus (32)

• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Phobos results on charged particle multiplicity and pseudorapidity distributions in Au+Au, Cu+Cu, d+Au, and p+p collisions at ultra-relativistic energies
• Systematic Studies of the Centrality and sqrt(s_NN) Dependence of dE_T/deta and dN_ch/deta in Heavy Ion Collisions at Mid-rapidity
• Beam-Energy Dependence of Directed Flow of Protons, Antiprotons and Pions in Au+Au Collisions
• Dense Nuclear Matter Equation of State from Heavy-Ion Collisions
• Directed flow in ultrarelativistic heavy-ion collisions
• Further developments of a multi-phase transport model for relativistic nuclear collisions
• Measurement of longitudinal flow de-correlations in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ and 5.02 TeV with the ATLAS detector
• Triangular flow in heavy ion collisions in a multiphase transport model
• Decorrelation of anisotropic flows along the longitudinal direction
• Longitudinal dynamics and particle production in relativistic nuclear collisions
• Separating the impact of nuclear skin and nuclear deformation in high-energy isobar collisions
• The torque effect and fluctuations of entropy deposition in rapidity in ultra-relativistic nuclear collisions
• Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in a multiphase transport model
• Beam energy dependence of Elliptic and Triangular flow with the AMPT model
• Forward-backward multiplicity correlations in the wounded nucleon model
• Longitudinal flow decorrelations in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector
• Forward-backward correlations and charged-particle azimuthal distributions in pp interactions using the ATLAS detector
• Transparency, Mixing and Reflection of Initial Flows in Relativistic Nuclear Collisions
• Forward-backward multiplicity fluctuation and longitudinal harmonics in high-energy nuclear collisions
• A method for studying the rapidity fluctuation and decorrelation of harmonic flow in heavy-ion collisions
• Forward-backward multiplicity fluctuations in heavy nuclei collisions in the wounded nucleon model
• Observables for longitudinal flow correlations in heavy-ion collisions
• A Centrality Detector Concept
• Determination of electron-nucleus collision geometry with forward neutrons
• Precision tests of the nonlinear mode coupling of anisotropic flow via high-energy collisions of isobars
• Investigation of the elliptic flow fluctuations of the identified particles using the A Multi-Phase Transport model
• Participant and spectator scaling of spectator fragments in Au+Au and Cu+Cu collisions at sqrt(sNN) = 19.6 and 22.4 GeV
• Wounded nucleon model and Deuteron-Gold collisions at RHIC
• Longitudinal correlations from fluctuating strings in Pb-Pb, p-Pb, and p-p collisions
• Bulk medium properties of heavy-ion collisions from the beam energy scan with a multistage hydrodynamic model
• Forward-backward multiplicity correlations in pp, pPb and Pb+Pb collisions with the ATLAS detector