Measuring momentum-dependent flow fluctuations in heavy-ion collisions
Maurício Hippert, D. D. Chinellato, Matthew Luzum, Jorge Noronha, Tiago Nunes da Silva, J. Takahashi
Abstract
In heavy-ion collisions, momentum-dependent pair correlations can be characterized by a principal component analysis (PCA), in which subleading modes are expected to reveal new information on flow fluctuations. However, we find that, as currently measured, these modes can be dominated by multiplicity fluctuations, which serve as an unwanted background. Here, we propose new PCA observables that are robust against multiplicity fluctuations and isolate novel sources of flow fluctuations, thus being suited to provide fresh insight into the initial stages of the system at small length scales.
Topics & Concepts
Multiplicity (mathematics)ObservablePhysicsHeavy ionFlow (mathematics)Principal component analysisStatistical physicsMomentum (technical analysis)Statistical fluctuationsIonMechanicsQuantum mechanicsStatisticsMathematicsFinanceEconomicsMathematical analysisHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle InteractionsParticle physics theoretical and experimental studies