The color glass condensate

McLerran, L.

doi:10.1016/s0375-9474(02)00688-7

Cited by 17 publications

(3 citation statements)

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“…Models based on initial state gluon saturation (e.g., the color glass condensate model [59,60]) or pQCD inspired models (e.g., the HIJING [42,61] or the soft/hard scattering model used in Ref. [29]) predict an increase of the rapidity density per participant nucleon with centrality.…”

Section: Total Particle Productionmentioning

confidence: 99%

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
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Identified charged-particle spectra of π ± , K ± , p, and p at midrapidity (|y| < 0.1) measured by the dE/dx method in the STAR (solenoidal tracker at the BNL Relativistic Heavy Ion Collider) time projection chamber are reported for pp and d + Au collisions at √ s NN = 200 GeV and for Au + Au collisions at 62.4, 130, and 200 GeV. Average transverse momenta, total particle production, particle yield ratios, strangeness, and baryon production rates are investigated as a function of the collision system and centrality. The transverse momentum spectra are found to be flatter for heavy particles than for light particles in all collision systems; the effect is more prominent for more central collisions. The extracted average transverse momentum of each particle species follows a trend determined by the total charged-particle multiplicity density. The Bjorken energy density estimate is at least several GeV/fm 3 for a formation time less than 1 fm/c. A significantly larger net-baryon density and a stronger increase of the net-baryon density with centrality are found in Au + Au collisions at 62.4 GeV than at the two higher energies. Antibaryon production relative to total particle multiplicity is found to be constant over centrality, but increases with the collision energy. Strangeness production relative to total particle multiplicity is similar at the three measured RHIC energies. Relative strangeness production increases quickly 034909-2 SYSTEMATIC MEASUREMENTS OF IDENTIFIED . . . (2009) with centrality in peripheral Au + Au collisions, to a value about 50% above the pp value, and remains rather constant in more central collisions. Bulk freeze-out properties are extracted from thermal equilibrium model and hydrodynamics-motivated blast-wave model fits to the data. Resonance decays are found to have little effect on the extracted kinetic freeze-out parameters because of the transverse momentum range of our measurements. The extracted chemical freeze-out temperature is constant, independent of collision system or centrality; its value is close to the predicted phase-transition temperature, suggesting that chemical freeze-out happens in the vicinity of hadronization and the chemical freeze-out temperature is universal despite the vastly different initial conditions in the collision systems. The extracted kinetic freeze-out temperature, while similar to the chemical freeze-out temperature in pp, d + Au, and peripheral Au + Au collisions, drops significantly with centrality in Au + Au collisions, whereas the extracted transverse radial flow velocity increases rapidly with centrality. There appears to be a prolonged period of particle elastic scatterings from chemical to kinetic freeze-out in central Au + Au collisions. The bulk properties extracted at chemical and kinetic freeze-out are observed to evolve smoothly over the measured energy range, collision systems, and collision centralities. PHYSICAL REVIEW C 79, 034909

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Section: Total Particle Productionmentioning

confidence: 99%

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
View full text Add to dashboard Cite

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“…One model for understanding this depletion of low-x partons in nuclei asserts that the rapid growth of gluons must saturate when the density reaches occupation numbers of order α −1 s (73). In this saturation scenario the nucleus is more appropriately described as a single gluonic wave function, sometimes referred to as the Color Glass Condensate (CGC) (74). Because the scale Q s at which gluon saturation occurs grows with nuclear mass (75), it has been proposed that this process may be described perturbatively for large nuclei, especially at very high energies (76).…”

Section: New Probes Of the Mediummentioning

confidence: 99%

Results from the Relativistic Heavy Ion Collider

Müller

Nagle

2006

Annu. Rev. Nucl. Part. Sci.

243

273

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We describe the current status of the heavy ion research program at the Relativistic Heavy Ion Collider (RHIC). The new suite of experiments and the collider energies have opened up new probes of the medium created in the collisions. Our review focuses on the experimental discoveries to date at RHIC and their interpretation in the light of our present theoretical understanding of the dynamics of relativistic heavy ion collisions and of the structure of strongly interacting matter at high energy density. CONTENTS

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“…Models based on initial state gluon saturation (e.g. the color glass condensate model [59,60]) or pQCD inspired models (e.g. the HIJING [42,61] or the soft/hard scattering model used in Ref.…”

Section: Total Particle Productionmentioning

confidence: 99%

Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR

Abelev

2008

Preprint

140

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Identified charged particle spectra of π ± , K ± , p and p at mid-rapidity (|y| < 0.1) measured by the dE/dx method in the STAR-TPC are reported for pp and d+Au collisions at √ s N N = 200 GeV and for Au+Au collisions at 62.4 GeV, 130 GeV, and 200 GeV. Average transverse momenta, total particle production, particle yield ratios, strangeness and baryon production rates are investigated as a function of the collision system and centrality. The transverse momentum spectra are found to be flatter for heavy particles than for light particles in all collision systems; the effect is more prominent for more central collisions. The extracted average transverse momentum of each particle species follows a trend determined by the total charged particle multiplicity density. The Bjorken energy density estimate is at least several GeV/fm 3 for a formation time less than 1 fm/c. A significantly larger net-baryon density and a stronger increase of the net-baryon density with centrality are found in Au+Au collisions at 62.4 GeV than at the two higher energies. Antibaryon production relative to total particle multiplicity is found to be constant over centrality, but increases with the collision energy. Strangeness production relative to total particle multiplicity is similar at the three measured RHIC energies. Relative strangeness production increases quickly with centrality in peripheral Au+Au collisions, to a value about 50% above the pp value, and remains rather constant in more central collisions. Bulk freeze-out properties are extracted from thermal equilibrium model and hydrodynamics-motivated blast-wave model fits to the data. Resonance decays are found to have little effect on the extracted kinetic freeze-out parameters due to the transverse momentum range of our measurements. The extracted chemical freeze-out temperature is constant, independent of collision system or centrality; its value is close to the predicted phase-transition temperature, suggesting that chemical freeze-out happens in the vicinity of hadronization and the chemical freezeout temperature is universal despite the vastly different initial conditions in the collision systems.The extracted kinetic freeze-out temperature, while similar to the chemical freeze-out temperature in pp, d+Au, and peripheral Au+Au collisions, drops significantly with centrality in Au+Au collisions, whereas the extracted transverse radial flow velocity increases rapidly with centrality. There appears to be a prolonged period of particle elastic scatterings from chemical to kinetic freeze-out in central Au+Au collisions. The bulk properties extracted at chemical and kinetic freeze-out are observed to evolve smoothly over the measured energy range, collision systems, and collision centralities.

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The color glass condensate

Cited by 17 publications

References 0 publications

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
View full text Add to dashboard Cite

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
View full text Add to dashboard Cite

Results from the Relativistic Heavy Ion Collider

Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR

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The color glass condensate

Cited by 17 publications

References 0 publications

Systematic measurements of identified particle spectra inpp,d+Au, andAuAbelev1, Aggarwal2, Ahammed3 et al. 2009Phys. Rev. C892699056View full textAdd to dashboardCite

Systematic measurements of identified particle spectra inpp,d+Au, andAuAbelev1, Aggarwal2, Ahammed3 et al. 2009Phys. Rev. C892699056View full textAdd to dashboardCite

Results from the Relativistic Heavy Ion Collider

Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR

Contact Info

Product

Resources

About

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
View full text Add to dashboard Cite

Systematic measurements of identified particle spectra inpp,d+Au, andAu
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2009
Phys. Rev. C
892
69
905
6
View full text Add to dashboard Cite