Size fluctuations of the initial source and the event-by-event transverse momentum fluctuations in relativistic heavy-ion collisions

Abstract

We show that the event-by-event fluctuations of the transverse size of the initial source, which follow directly from the Glauber treatment of the earliest stage of relativistic heavy-ion collisions, cause, after hydrodynamic evolution, fluctuations of the transverse flow velocity at hadronic freeze-out. This in turn leads to event-by-event fluctuations of the average transverse momentum, p_T. Simulations with GLISSANDO for the Glauber phase, followed by a realistic hydrodynamic evolution and statistical hadronization carried out with THERMINATOR, lead to agreement with the RHIC data. In particular, the magnitude of the effect, its centrality dependence, and the weak dependence on the incident energy are properly reproduced. Our results show that bulk of the observed event-by-event p_T fluctuations may be explained by the fluctuations of the size of the initial source.

5 pages, 4 figures, version accepted in PRC

References in corpus (11)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• GLISSANDO: GLauber Initial-State Simulation AND mOre
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Therminator: Thermal heavy-Ion generator
• On the necessity to include event-by-event fluctuations in experimental evaluation of elliptical flow
• Fluctuating initial conditions in heavy-ion collisions from the Glauber approach
• Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC
• A Monte Carlo generator of nucleon configurations in complex nuclei including Nucleon-Nucleon correlations
• Azimuthally-sensitive femtoscopy from RHIC to LHC in hydrodynamics with statistical hadronization
• NeXSPheRIO Results on Elliptic-Flow Fluctuations at RHIC
• Hydrodynamic Description of Heavy Ion Collisions

Cited by in corpus (47)

• Triangular flow in hydrodynamics and transport theory
• THERMINATOR 2: THERMal heavy IoN generATOR 2
• GLISSANDO 2: GLauber Initial-State Simulation AND mOre..., ver. 2
• Torqued fireballs in relativistic heavy-ion collisions
• Thermodynamics of hot strong-interaction matter from ultrarelativistic nuclear collisions
• Transverse momentum fluctuations and their correlation with elliptic flow in nuclear collision
• Transverse-momentum fluctuations in relativistic heavy-ion collisions from event-by-event viscous hydrodynamics
• Transverse momentum-flow correlations in relativistic heavy-ion collisions
• Evidence of the triaxial structure of ${}^{129}$Xe at the Large Hadron Collider
• Wounded quarks in A+A, p+A, and p+p collisions
• Constraining the quadrupole deformation of atomic nuclei with relativistic nuclear collisions
• Event shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at $\sqrt{s_\rm{NN}}=2.76$ TeV
• Fluctuations of harmonic and radial flow in heavy ion collisions with principal components
• Correlation between mean transverse momentum and anisotropic flow in heavy-ion collisions
• Eccentricity fluctuations in an integrated hybrid approach: Influence on elliptic flow
• Centrality fluctuations in heavy-ion collisions
• Fluctuation Probes of Early-Time Correlations in Nuclear Collisions
• Probing nuclear structure with mean transverse momentum in relativistic isobar collisions
• Transverse momentum fluctuations in ultrarelativistic Pb+Pb and p+Pb collisions with wounded quarks
• Correlation coefficient between harmonic and transverse flow in heavy-ion collisions
• Two-body nucleon-nucleon correlations in Glauber models of relativistic heavy-ion collisions
• GLISSANDO 3: GLauber Initial-State Simulation AND mOre..., ver. 3
• Skewness of mean transverse momentum fluctuations in heavy-ion collisions
• Wounded nucleon model with realistic nucleon-nucleon collision profile and observables in relativistic heavy-ion collisions
• Correlations in the Monte Carlo Glauber model
• Exploring the compactness of $\alpha$ cluster in ${}^{16}$O nuclei with relativistic ${}^{16}$O+${}^{16}$O collisions
• Hydrodynamic modeling of pseudorapidity flow correlations in relativistic heavy-ion collisions and the torque effect
• $p_T$-Dependent Particle Number Fluctuations From Principal Component Analyses in Hydrodynamic Simulations of Heavy-Ion Collisions
• Continuous description of fluctuating eccentricities
• Beam Fragmentation in Heavy Ion Collisions with Realistically Correlated Nuclear Configurations
• Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations
• Effective shear and bulk viscosities for anisotropic flow
• Higher order cumulants of transverse momentum and harmonic flow in relativistic heavy ion collisions
• Nucleon-nucleon collision profile and cross section fluctuations
• Constraining the equation of state with identified particle spectra
• Pseudorapidity profile of transverse momentum fluctuations in heavy ion collisions
• Model study of the energy dependence of the correlation between anisotropic flow and the mean transverse momentum in Au+Au collisions
• Thermal nature of charmonium transverse momentum spectra from Au-Au collisions at the highest energies available at the BNL Relativistic Heavy Ion Collider (RHIC)
• Observing the deformation of nuclei with relativistic nuclear collisions
• Study of $⟨p_{\mathrm{T}}⟩$ and its higher moments, and extraction of the speed of sound in Pb-Pb collisions with ALICE
• Longitudinal correlations in the initial stages of ultra-relativistic nuclear collisions
• Turning up and down strong magnetic fields in relativistic nuclear collisions
• Charge balancing and the fall off of the ridge
• Extracting the speed of sound of QCD from transverse momentum fluctuations
• Rapidity dependence of mean transverse momentum fluctuation and decorrelation in baryon-dense medium
• Fluctuations in ultra-relativistic heavy ion collisions
• $p_T$-dependent multiplicity fluctuations from PCA and initial conditions