An improved method to access initial states in relativistic heavy-ion collisions

Observables in heavy-ion collisions are generally categorized into centralities, which reflect an average over events within a range of impact parameters including a wide variety of initial-state configurations. A multiple binning method using spectator neutrons within each centrality has been shown...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-10, Vol.82 (10), p.1-9, Article 855
Main Authors: Bhatta, Somadutta, Bairathi, Vipul
Format: Article
Language:English
Subjects:
Analysis
Astronomy
Astrophysics and Cosmology
Charged particles
Collisions (Nuclear physics)
Elementary Particles
Hadrons
Heavy Ions
Ionic collisions
Measurement Science and Instrumentation
Methods
Nuclear Energy
Nuclear Physics
Parameter sensitivity
Particle production
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Quantum Field Theories
Quantum Field Theory
Regular Article - Experimental Physics
String Theory
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Summary:Observables in heavy-ion collisions are generally categorized into centralities, which reflect an average over events within a range of impact parameters including a wide variety of initial-state configurations. A multiple binning method using spectator neutrons within each centrality has been shown to provide access to events with rare initial-state conditions. This work suggests an improvement in quantifying the difference between standard centrality and spectator neutron binning towards accessing the initial-state properties. A selection of events with higher initial-state density at a fixed participating nucleon number was observed to result in larger final-state particle production and smaller elliptic flow. The relative difference between observables in centrality and spectator binning shows reduced sensitivity for the observables dominated by impact parameter fluctuations in the initial state, such as triangular flow. This property renders the spectator binning method a good candidate for separating geometric contributions from random fluctuations in the initial state towards final-state observables.
ISSN:1434-6052
1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10824-w