Spin femtoscopy is proposed to separate genuine two-particle spin correlations from quantum statistics and final-state interaction effects via spin-sensitive correlation functions on Lambda pairs.
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Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
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abstract
Extensive experimental data from high-energy nucleus-nucleus collisions were recorded using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The comprehensive set of measurements from the first three years of RHIC operation includes charged particle multiplicities, transverse energy, yield ratios and spectra of identified hadrons in a wide range of transverse momenta (p_T), elliptic flow, two-particle correlations, non-statistical fluctuations, and suppression of particle production at high p_T. The results are examined with an emphasis on implications for the formation of a new state of dense matter. We find that the state of matter created at RHIC cannot be described in terms of ordinary color neutral hadrons.
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First measurement of the nuclear modification factor R_AA in OO collisions at 5.36 TeV shows suppression with a minimum of 0.69 at p_T around 6 GeV, favoring models with parton energy loss.
Analytic nonlinear response coefficients for v2 and v4 in Gubser flow are derived, including a participant-plane angle factor that modifies strength and sign of the response.
BEDA kinetic evolution washes out initial azimuthal anisotropies with higher harmonics relaxing faster and shifts the pT peak of vn upward, qualitatively matching small-system data.
Second-order Chapman-Enskog viscous corrections suppress heavy-quark drag, induce nontrivial transverse diffusion, and boost early-time dilepton yields relative to first-order or Grad corrections, with the size of the effect set by the interplay between correction momentum dependence and observable
A quantum simulation framework is developed and demonstrated for energy loss and hadronization of a heavy quark in 1+1D SU(2) lattice gauge theory on 18 qubits of IBM hardware, with results matching classical simulations.
ATLAS presents first v_n (n=2-4) measurements in O+O and Ne+Ne collisions, showing a flow hierarchy and a central Ne+Ne v2 enhancement consistent with prolate neon deformation.
STAR reports 20% suppression of recoiling hadrons and jets in high-event-activity O+O collisions at 200 GeV, with a measured 0.7 GeV/c pT shift for large-radius jets, providing evidence for jet quenching in small systems.
A new RTA form with counter-terms yields species-dependent first-order viscous corrections that modify light-hadron yields and K/π, p/π ratios in p-Pb and Pb-Pb collisions.
Proposes EIC jet-pion-electron measurements to detect and quantify short-range quark pair correlations in protons, expecting ud pairs to dominate due to diquark attraction.
Using a phenomenologically motivated spectrum shift model, the authors estimate partonic Δp_T loss and demonstrate its correlation with initial energy density ε_Bj across collision energies, then predict high-pT v2 that agrees with data.
STAR reports energy-dependent variances and covariances of [p_T] and v_n^2 in Au+Au collisions from 14.6 to 200 GeV, with the dimensionless ratio remaining similar across energies.
Species-resolved scaling functions for azimuthal anisotropy from iEBE-VISHNU simulations of Pb+Pb collisions collapse robustly across kinematics and species, enabling constraints on attenuation, collective expansion, and hadronic re-scattering via an energy-dependent baseline.
Toy models show multi-particle correlators can increase rather than reduce deviation from true flow harmonics in small collision systems.
Bayesian posteriors from JETSCAPE jet-quenching model are largely compatible across centrality but exhibit shifts across beam energy and observable class, with varying ability to predict complementary datasets.
Time-correlated thermal noise modeled with a fractional derivative substantially alters heavy quark momentum correlations, displacement, and transverse-momentum moments in hot QCD matter.
The equilibrated core in O+O collisions overtakes the nonequilibrium corona above midrapidity multiplicity of about 20, yet corona contributions persist in central events, making pure hydrodynamics inadequate.
AMPT model calculations indicate that forward-backward asymmetry in D0 meson RpPb and v2 in 8.16 TeV p-Pb collisions arises from initial-state cold nuclear effects and final-state partonic interactions, with coalescence-fragmentation competition shaping the pT and rapidity dependence, suggesting par
Holographic calculation in a spinning Myers-Perry black brane shows that higher temperature or rotation parameter a shortens light-quark stopping distance and increases instantaneous energy loss, with stronger anisotropy for transverse motion.
AMPT simulations show the ratio of nonlinear response coefficients between U+U and Au+Au collisions remains stable across evolution stages, isolating initial geometric correlations.
Comparative analysis of published jet quenching data shows radius dependence differs between single-jet and dijet selections and between experiments, but fractional energy loss S_loss reduces sensitivity to the pp spectral shape for cross-experiment comparisons.
CMS measures V_nΔ in pPb events at √s_NN = 8.16 TeV as a function of forward rapidity gap width, p_T, and multiplicity in γPb and IP Pb enriched samples, comparing to prior pp, pPb, and γp data plus event generators.
citing papers explorer
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Spin Femtoscopy: A Framework for Revealing Genuine Spin Correlations
Spin femtoscopy is proposed to separate genuine two-particle spin correlations from quantum statistics and final-state interaction effects via spin-sensitive correlation functions on Lambda pairs.
-
Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions
First measurement of the nuclear modification factor R_AA in OO collisions at 5.36 TeV shows suppression with a minimum of 0.69 at p_T around 6 GeV, favoring models with parton energy loss.
-
Nonlinear response of flow harmonics in Gubser flow with participant-reaction planes mismatch
Analytic nonlinear response coefficients for v2 and v4 in Gubser flow are derived, including a participant-plane angle factor that modifies strength and sign of the response.
-
Azimuthal momentum isotropization in the Quark-Gluon Plasma thermalization
BEDA kinetic evolution washes out initial azimuthal anisotropies with higher harmonics relaxing faster and shifts the pT peak of vn upward, qualitatively matching small-system data.
-
Observable Dependence of Viscous Corrections in QGP: Heavy Quarks and Dileptons in Chapman--Enskog Theory
Second-order Chapman-Enskog viscous corrections suppress heavy-quark drag, induce nontrivial transverse diffusion, and boost early-time dilepton yields relative to first-order or Grad corrections, with the size of the effect set by the interplay between correction momentum dependence and observable
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A Framework for Quantum Simulations of Energy-Loss and Hadronization in Non-Abelian Gauge Theories: SU(2) Lattice Gauge Theory in 1+1D
A quantum simulation framework is developed and demonstrated for energy loss and hadronization of a heavy quark in 1+1D SU(2) lattice gauge theory on 18 qubits of IBM hardware, with results matching classical simulations.
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Measurement of the azimuthal anisotropy of charged particles in $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV $^{16}$O$+^{16}$O and $^{20}$Ne$+^{20}$Ne collisions with the ATLAS detector
ATLAS presents first v_n (n=2-4) measurements in O+O and Ne+Ne collisions, showing a flow hierarchy and a central Ne+Ne v2 enhancement consistent with prolate neon deformation.
-
Measurement of jet quenching in O+O collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV by the STAR experiment at RHIC
STAR reports 20% suppression of recoiling hadrons and jets in high-event-activity O+O collisions at 200 GeV, with a measured 0.7 GeV/c pT shift for large-radius jets, providing evidence for jet quenching in small systems.
-
Species-dependent viscous corrections at particlization: A novel relaxation time approximation approach
A new RTA form with counter-terms yields species-dependent first-order viscous corrections that modify light-hadron yields and K/π, p/π ratios in p-Pb and Pb-Pb collisions.
-
Short-Range Correlations Between Partons in a Proton
Proposes EIC jet-pion-electron measurements to detect and quantify short-range quark pair correlations in protons, expecting ud pairs to dominate due to diquark attraction.
-
Probing the Dependence of Partonic Energy Loss on the Initial Energy Density of the Quark Gluon Plasma
Using a phenomenologically motivated spectrum shift model, the authors estimate partonic Δp_T loss and demonstrate its correlation with initial energy density ε_Bj across collision energies, then predict high-pT v2 that agrees with data.
-
Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC
STAR reports energy-dependent variances and covariances of [p_T] and v_n^2 in Au+Au collisions from 14.6 to 200 GeV, with the dimensionless ratio remaining similar across energies.
-
Species-Resolved Scaling of Azimuthal Anisotropy: Constraining Attenuation, Collective Expansion, and Hadronic Dynamics in Hydrodynamic Simulations
Species-resolved scaling functions for azimuthal anisotropy from iEBE-VISHNU simulations of Pb+Pb collisions collapse robustly across kinematics and species, enabling constraints on attenuation, collective expansion, and hadronic re-scattering via an energy-dependent baseline.
-
Effectiveness of nonflow suppression using multi-particle correlators
Toy models show multi-particle correlators can increase rather than reduce deviation from true flow harmonics in small collision systems.
-
Bayesian inference constraints on jet quenching across centrality, beam energy, and observable classes in LHC heavy-ion collisions
Bayesian posteriors from JETSCAPE jet-quenching model are largely compatible across centrality but exhibit shifts across beam energy and observable class, with varying ability to predict complementary datasets.
-
Memory effect on the heavy quark dynamics in hot QCD matter
Time-correlated thermal noise modeled with a fractional derivative substantially alters heavy quark momentum correlations, displacement, and transverse-momentum moments in hot QCD matter.
-
Equilibrated fraction of QCD matter in high-energy oxygen--oxygen collisions
The equilibrated core in O+O collisions overtakes the nonequilibrium corona above midrapidity multiplicity of about 20, yet corona contributions persist in central events, making pure hydrodynamics inadequate.
-
Investigating forward-backward asymmetry in D-meson production and anisotropic flow in p-Pb collisions at the LHC
AMPT model calculations indicate that forward-backward asymmetry in D0 meson RpPb and v2 in 8.16 TeV p-Pb collisions arises from initial-state cold nuclear effects and final-state partonic interactions, with coalescence-fragmentation competition shaping the pT and rapidity dependence, suggesting par
-
Holographic light-quark energy loss in a spinning plasma
Holographic calculation in a spinning Myers-Perry black brane shows that higher temperature or rotation parameter a shortens light-quark stopping distance and increases instantaneous energy loss, with stronger anisotropy for transverse motion.
-
Investigation of Nonlinear Collective Dynamics in Relativistic Heavy-Ion Collisions Using A Multi-Phase Transport Model
AMPT simulations show the ratio of nonlinear response coefficients between U+U and Au+Au collisions remains stable across evolution stages, isolating initial geometric correlations.
-
Jet Radius Dependence of Energy Loss in Pb+Pb Collisions: A Comparative Analysis of the Ratio of Nuclear Modification Factors and Fractional Energy Loss
Comparative analysis of published jet quenching data shows radius dependence differs between single-jet and dijet selections and between experiments, but fractional energy loss S_loss reduces sensitivity to the pp spectral shape for cross-experiment comparisons.
-
Dependence of two-particle azimuthal correlations on the forward rapidity gap width in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV
CMS measures V_nΔ in pPb events at √s_NN = 8.16 TeV as a function of forward rapidity gap width, p_T, and multiplicity in γPb and IP Pb enriched samples, comparing to prior pp, pPb, and γp data plus event generators.
- High-order fluctuations of temperature in hot QCD matter