Measuring Momentum-Dependent Flow Fluctuations in Heavy-Ion Collisions

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.

arXiv comment9 pages, 4 figures. Published version

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Cited by in corpus (12)

• Transverse momentum fluctuations and their correlation with elliptic flow in nuclear collision
• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter
• Studying QGP with flow: A theory overview
• Pre-hydrodynamic evolution and its signatures in final-state heavy-ion observables
• Estimating Elliptic Flow Coefficient in Heavy Ion Collisions using Deep Learning
• Deep learning predicted elliptic flow of identified particles in heavy-ion collisions at the RHIC and LHC energies
• Probing the structure of the initial state of heavy-ion collisions with $p_T$-dependent flow fluctuations
• Robustness of principal component analysis on harmonic flow in heavy ion collisions
• Azimuthal angle correlations of muons produced via heavy-flavor decays in 5.02 TeV Pb+Pb and $pp$ collisions with the ATLAS detector
• Momentum-dependent flow fluctuations as a hydrodynamic response to initial geometry
• Systematic study of flow vector fluctuations in $\sqrt{{\text{s}}_{{}_{\mathbf{NN}}}}=5.02$ TeV Pb-Pb collisions
• $p_T$-dependent multiplicity fluctuations from PCA and initial conditions