Centrality evolution of $p_t$ and $y_t$ spectra from Au-Au collisions at $\sqrt{s_{NN}}=200$ GeV

Abstract

A two-component analysis of spectra to $p_t=12$ GeV/c for identified pions and protons from 200 GeV Au-Au collisions is presented. The method is similar to an analysis of the $n_{ch}$ dependence of $p_t$ spectra from p-p collisions at 200 GeV, but applied to Au-Au centrality dependence. The soft-component reference is a Lévy distribution on transverse mass $m_t$. The hard-component reference is a Gaussian on $y_t$ with exponential ($p_t$ power-law) tail. Deviations of data from the reference are described by hard-component ratio $r_{AA}$ which generalizes nuclear modification factor $R_{AA}$. The analysis suggests that centrality evolution of pion and proton spectra is dominated by changes in parton fragmentation. The structure of $r_{AA}$ suggests that parton energy loss produces a negative boost $\Delta y_t$ of a large fraction (but not all) of the minimum-bias fragment distribution, and that lower-energy partons suffer relatively less energy loss, possibly due to color screening. The analysis also suggests that the anomalous $p/\pi$ ratio may be due to differences in the parton energy-loss process experienced by the two hadron species. This analysis provides no evidence for radial flow.

arXiv comment21 pages, 18 figures

References in corpus (27)

• Thermal phenomenology of hadrons from 200 AGeV S+S collisions
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Flow at the SPS and RHIC as a Quark Gluon Plasma Signature
• Heavy quark colorimetry of QCD matter
• Hadron production in nuclear collisions at RHIC and high density QCD
• Parton coalescence and antiproton/pion anomaly at RHIC
• Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase
• Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
• Chemical Equilibration in Pb+Pb Collisions at the SPS
• Identified particle distributions in pp and Au+Au collisions at sqrt{s_NN}=200 GeV
• Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics
• Jet Tomography of Hot and Cold Nuclear Matter
• Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Transverse flow and hadro-chemistry in Au+Au collisions at \sqrt{s_{NN}}=200 GeV
• Minijet deformation and charge-independent angular correlations on momentum subspace $(\eta ,\varphi )$ in Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV
• Recombination of Shower Partons at High $p_T$ in Heavy-Ion Collisions
• Effect of Jet Quenching on High-$p_T$ Hadron Spectra in High-energy Nuclear Collisions
• Pion, kaon, proton and anti-proton transverse momentum distributions from p+p and d+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Testing the theory of QGP-induced energy loss at RHIC and the LHC
• The multiplicity dependence of inclusive $p_t$ spectra from p-p collisions at $\sqrt{s}$ = 200 GeV
• Possible scenarios for soft and semi-hard components structure in central hadron-hadron collisions in the TeV region
• Final-State Interaction as the Origin of the Cronin Effect
• Application of nonextensive statistics to particle and nuclear physics
• The non-Abelian feature of parton energy loss in energy dependence of jet quenching in high-energy heavy-ion collisions
• Extrapolating parton fragmentation to low $Q^2$ in $e^{+}$-$e^{-}$ collisions
• Results of the Hydrodynamics Approach to Heavy Ion Collisions
• Two-particle correlations on transverse momentum and momentum dissipation in Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV

Cited by in corpus (31)

• Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 62 and 200 GeV
• Scaling properties at freeze-out in relativistic heavy ion collisions
• Evolution of minimum-bias parton fragmentation in nuclear collisions
• Higher Flow Harmonics in Heavy Ion Collisions from STAR
• Parton fragment yields derived from minimum-bias jet angular correlations
• Azimuth quadrupole component spectra on transverse rapidity ${\mathbf{y}}_{\mathbf{t}}$ for identified hadrons from Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV
• Is hydrodynamics relevant to RHIC collisions?
• Parton fragmentation in the vacuum and in the medium
• CCharge-multiplicity dependence of single-particle transverse-rapidity ${\mathbf{y}}_{\mathbf{t}}$ and pseudorapidity $\eta$ densities and 2D angular correlations from 200 GeV $p$-$p$ collisions
• A critical review of RHIC experimental results
• Comparing the same-side "ridge" in CMS p-p angular correlations to RHIC p-p data
• Dijet production, collision centrality and backgrounds in high-energy p-p collisions
• On the presence of nonjet "higher harmonic" components in 2D angular correlations from high energy heavy ion collisions
• Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment
• Extensive/nonextensive statistics for $p_T$ distributions of various charged particles produced in p+p and A+A collisions in a wide range of energies
• Gluon correlations from a Glasma flux-tube model compared to measured hadron correlations on transverse momentum $({\mathbf{p}}_{\mathbf{t}},{\mathbf{p}}_{\mathbf{t}})$ and angular differences $({\eta }_{\mathbf{\Delta }},{\varphi }_{\mathbf{\Delta }})$
• Ensemble mean ${\mathbf{p}}_{\mathbf{t}}$ vs charged-hadron multiplicities in high energy nuclear collisions
• Charge-multiplicity and collision-energy dependence of $p_t$ spectra from $p$-$p$ collisions at the relativistic heavy-ion collider and large hadron collider
• Two-component model of 2D trigger-associated hadron correlations on rapidity space ${\mathbf{y}}_{\mathbf{ta}}\times {\mathbf{y}}_{\mathbf{tt}}$ derived from 1D ${\mathbf{p}}_{\mathbf{t}}$ spectra for p-p collisions at $\sqrt{\mathbf{s}}=200$ GeV
• Glasma flux tubes vs minimum-bias jets in 2D angular correlations on $\eta$ and $\varphi$
• Phenomenological models of two-particle correlation distributions on transverse momentum in relativistic heavy-ion collisions
• Optimal modeling of 1D azimuth correlations in the context of Bayesian inference
• System-size scan of dihadron azimuthal correlations in ultra-relativistic heavy ion collisions
• Minimizing statistical and systematic bias in transverse momentum correlations for relativistic heavy-ion collisions
• QCD prediction of jet structure in 2D trigger-associated momentum correlations and implications for multiple parton interactions
• PYTHIA and the preoccupied proton
• Rescuing the nonjet (NJ) azimuth quadrupole from the flow narrative
• $\mathbf{p}$-$\mathbf{p}$ minimum-bias dijets and nonjet quadrupole in relation to conjectured collectivity (flows) in high-energy nuclear collisions
• The "soft ridge" - is it initial-state geometry or modified jets?
• Proton/Pion ratios in Δϕwith respect to a jet in sqrt{s_{NN}} =200 GeV Au+Au collisions at STAR
• QGP droplet formation in small asymmetric collision systems