Directed flow at midrapidity in heavy-ion collisions

Abstract

It was recently shown that fluctuations in the initial geometry of a heavy ion collision generally result in a dipole asymmetry of the distribution of outgoing particles. This asymmetry, unlike the usual directed flow, is expected to be present at a wide range of rapidity -- including midrapidity. First evidence of this phenomenon can be seen in recent two-particle correlation data by STAR, providing the last element necessary to quantitatively describe long-range dihadron correlations. We extract differential directed flow from these data and propose a new direct measurement.

4 pages, 1 figure; v3: fixed factors of 2 in Eqs. 3,4; v2: a number of minor improvements, version accepted for publication in PRL

References in corpus (3)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• Momentum spectra, anisotropic flow, and ideal fluids
• Collective flow and long-range correlations in relativistic heavy ion collisions

Cited by in corpus (67)

• Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector
• Mapping the hydrodynamic response to the initial geometry in heavy-ion collisions
• Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Beam-Energy Dependence of Directed Flow of Protons, Antiprotons and Pions in Au+Au Collisions
• The ALICE experiment: a journey through QCD
• Determining initial-state fluctuations from flow measurements in heavy-ion collisions
• Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeV
• Third Harmonic Flow of Charged Particles in Au+Au Collisions at sqrtsNN = 200 GeV
• Eliminating experimental bias in anisotropic-flow measurements of high-energy nuclear collisions
• Beam-Energy Dependence of Directed Flow of $\Lambda$, $\bar{\Lambda }$, $K^{\pm }$, $K_s^0$ and $\varphi$ in Au+Au Collisions
• Anisotropic flow of thermal photons as a quark-gluon plasma viscometer
• Understanding anisotropy generated by fluctuations in heavy-ion collisions
• Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$=2.76 TeV
• Flow fluctuations and long-range correlations: elliptic flow and beyond
• Mode-coupling effects in anisotropic flow in heavy-ion collisions
• A fully relativistic lattice Boltzmann algorithm
• Directed flow at mid-rapidity in event-by-event hydrodynamics
• Directed flow at midrapidity in sqrt(s_NN)=2.76 TeV Pb+Pb collisions
• Flow and interferometry results from Au+Au collisions at $\sqrt{{\text{s}}_{NN}}$ = 4.5 GeV
• Azimuthal harmonics in small and large collision systems at RHIC top energies
• Charge-dependent directed flow in asymmetric nuclear collisions
• Initial state anisotropies and their uncertainties in ultrarelativistic heavy-ion collisions from the Monte Carlo Glauber model
• Holographic Heavy-Ion Collisions: Analytic Solutions with Longitudinal Flow, Elliptic Flow and Vorticity
• The first moment of azimuthal anisotropy in nuclear collisions from AGS to LHC energies
• A method for studying initial geometry fluctuations via event plane correlations in heavy ion collisions
• Transport properties of anisotropically expanding quark-gluon plasma within a quasi-particle model
• On the bulk viscosity of anisotropically expanding hot QCD plasma
• Correlations in the Monte Carlo Glauber model
• Disentangling flow and nonflow correlations via Bayesian unfolding of the event-by-event distributions of harmonic coefficients in ultrarelativistic heavy-ion collisions
• Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions
• Spectator induced electromagnetic effect on directed flow in heavy ion collisions
• Continuous description of fluctuating eccentricities
• Event-by-event viscous hydrodynamics for Cu-Au collisions at 200GeV
• A method to test the coupling strength of the linear and nonlinear contributions to higher-order flow harmonics via Event Shape Engineering
• Beam-Energy Dependence of the Directed Flow of Deuterons in Au+Au Collisions
• New flow observables
• Directed flow of open charm in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV using a quark coalescence model
• Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC
• Revisit of directed flow in relativistic heavy-ion collisions from a multiphase transport model
• Azimuthal Anisotropy in U+U Collisions at $\sqrt{s_{NN}}=193$ GeV with STAR Detector at RHIC
• Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions
• Collective Expansion at the LHC: selected ALICE anisotropic flow measurements
• Triggered di-hadron correlations in Pb--Pb collisions from the ALICE experiment
• Directed flow of photons in Cu+Au collisions at RHIC
• A model investigation of the longitudinal broadening of the transverse momentum two-particle correlator
• A study of the anisotropy associated with dipole asymmetry in heavy ion collisions
• Dependence of asymmetries for charge distribution with respect to the reaction plane on initial energy in heavy ion collisions
• Jet-hadron correlations measured relative to the second order event plane in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Hydrodynamic simulations of directed flow for light hadrons in Au+Au and isobar collisions $\sqrt{s_{\text{NN}}}=$ 200 GeV
• Event plane dependence of the flow modulated background in di-hadron and jet-hadron correlations in heavy ion collisions
• Directed flow of quarks from the RHIC Beam Energy Scan measured by STAR
• Azimuthal dependence of two-particle transverse momentum current correlations
• Beam energy and system dependence of rapidity-even dipolar flow
• Probing the profile of bulk matter in p+Pb collisions via directed flow of heavy quarks
• Dipole asymmetry at $\sqrt{s_{NN}}=200$ GeV Au+Au Collisions from STAR experiment at RHIC
• Model studies of fluctuations in the background for jets in heavy ion collisions
• Reexamining the iconic dihadron correlation measurement demonstrating jet quenching
• Examining the influence of hadronic interactions on the directed flow of identified particles in RHIC Beam Energy Scan energies using UrQMD model
• Probing Nuclear Geometry through Multi-Particle Azimuthal Correlations and Rapidity-Even Dipolar Flow in ${}^{16}$O+${}^{16}$O Collisions
• Measurement of Kaon Directed Flow in Au+Au Collisions in the High Baryon Density Region
• Hydrodynamical response of plane correlation in Pb+Pb collisions at $\sqrt{s_{\text{NN}}}$=2.76 TeV
• Measurement of $v_n$ coefficients and event plane correlations in 2.76 TeV Pb-Pb collisions with ATLAS
• Exploring Rapidity-Even Dipolar Flow in Isobaric Collisions at RHIC
• Measuring differential particle correlations in relativistic nuclear collisions
• A Large-$N$ Expansion for Minimum Bias
• Reconstructing jet anisotropies with cumulants