Coherence Angle in Heavy-Ion Reactions

Braun‐Munzinger, P.; Barrette, J.

doi:10.1103/physrevlett.44.719

Cited by 126 publications

(166 citation statements)

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“…Spatial inhomogeneity of the flavor composition is no real surprise, even in collision of truely heavy ions. On the other side, parametrizations of 'hydrodynamical flow' under the homogeneity assumption have been quite popular for studies of light ion reactions [81,82]. One can take the RQMD calculations presented here as an indication that results in such simple models have to be taken with some grain of salt.…”

Section: Rapidity Distributionsmentioning

confidence: 99%

Flavor production in Pb(160AGeV) on Pb collisions: Effect of color ropes and hadronic rescattering

1995

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Collective interactions in the preequilibrium quark matter and hadronic resonance gas stage of ultrarelativistic nucleus-nucleus collisions are studied in the framework of the the transport theoretical approach RQMD. The paper reviews string fusion into color ropes and hadronic rescattering which serve as models for these interactions. Hadron production in central Pb(160AGeV) on Pb collisions has been calculated. The changes of the final flavor composition are more pronounced than in previous RQMD studies of light ion induced reactions at 200AGeV. The ratio of created quark pairs ss/(uū+dd) is enhanced by a factor of 2.4 in comparison to pp results. Color rope formation increases the initially produced antibaryons to 3 times the value in the 'NN mode', but only one quarter of the produced antibaryons survives because of subsequent strong absorption. The differences in the final particle composition for Pb on Pb collisions compared to S induced reactions are attributed to the hadronic resonance gas stage which is baryon-richer and lasts longer. *

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Section: Rapidity Distributionsmentioning

confidence: 99%

Flavor production in Pb(160AGeV) on Pb collisions: Effect of color ropes and hadronic rescattering

1995

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“…This ensemble is the most widely used in applications to heavy-ion collisions [5,26,27,28,29,30,31,32,33,34,35]. Within this ensemble, conservation laws for energy and quantum or particle numbers are enforced on average through the temperature and chemical potentials.…”

Section: The Grand-canonical Ensemblementioning

confidence: 99%

THERMUS—A thermal model package for ROOT

Wheaton

Cleymans

Hauer

2009

Computer Physics Communications

305

289

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THERMUS is a package of C++ classes and functions allowing statistical-thermal model analyses of particle production in relativistic heavy-ion collisions to be performed within the ROOT framework of analysis. Calculations are possible within three statistical ensembles; a grand-canonical treatment of the conserved charges B, S and Q, a fully canonical treatment of the conserved charges, and a mixedcanonical ensemble combining a canonical treatment of strangeness with a grandcanonical treatment of baryon number and electric charge. THERMUS allows for the assignment of decay chains and detector efficiencies specific to each particle yield, which enables sensible fitting of model parameters to experimental data. Nature of problem:Statistical-thermal model analyses of heavy-ion collision data require the calculation of both primordial particle densities and contributions from resonance decay. A set of thermal parameters (the number depending on the particular model imposed) and a set of thermalised particles, with their decays specified, is required as input to these models. The output is then a complete set of primordial thermal quantities for each particle, together with the contributions to the final particle yields from resonance decay.In many applications of statistical-thermal models it is required to fit experimental particle multiplicities or particle ratios. In such analyses, the input is a set of experimental yields and ratios, a set of particles comprising the assumed hadron resonance gas formed in the collision and the constraints to be placed on the system. The thermal model parameters consistent with the specified constraints leading to the best-fit to the experimental data are then output. Solution method:THERMUS is a package designed for incorporation into the ROOT [2] framework, used extensively by the heavy-ion community. As such, it utilises a great deal of ROOT's functionality in its operation. ROOT features used in THERMUS include its containers, the wrapper TMinuit implementing the MINUIT fitting package, and the TMath class of mathematical functions and routines. Arguably the most useful feature is the utilisation of CINT as the control language, which allows interactive 2 access to the THERMUS objects. Three distinct statistical ensembles are included in THERMUS, while additional options to include quantum statistics, resonance width and excluded volume corrections are also available. THERMUS provides a default particle list including all mesons (up to the K * 4 (2045)) and baryons (up to the Ω − ) listed in the July 2002 Particle Physics Booklet [3]. For each typically unstable particle in this list, THERMUS includes a text-file listing its decays. With thermal parameters specified, THERMUS calculates primordial thermal densities either by performing numerical integrations or else, in the case of the Boltzmann approximation without resonance width in the grand-canonical ensemble, by evaluating Bessel functions. Particle decay chains are then used to evaluate experimental observables...

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“…The initially uncorrelated charm quarks c and c can recombine into a charmonium. This process is called regeneration [9][10][11]. In high-energy nuclear collisions, these two effects are co-existing and their relative strength is energy dependent.…”

Section: Introductionmentioning

confidence: 99%

Medium effects on charmonium production at ultrarelativistic energies available at the CERN Large Hadron Collider

et al. 2014

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We investigate with a transport approach the cold and hot nuclear matter effects on the charmonium transverse momentum distributions in relativistic heavy ion collisions. The newly defined nuclear modification factor r AA = p 2 T AA / p 2 T pp and elliptic flow v 2 for J/ψ are sensitive to the nature of the hot medium and the thermalization of heavy quarks. From SPS through RHIC to LHC colliding energies, we observe dramatic changes in the centrality dependence of r AA . We find that at LHC energy, the finally observed charmonia are dominated by the regeneration from thermalized heavy quarks.

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Coherence Angle in Heavy-Ion Reactions

Cited by 126 publications

References 10 publications

Flavor production in Pb(160AGeV) on Pb collisions: Effect of color ropes and hadronic rescattering

Flavor production in Pb(160AGeV) on Pb collisions: Effect of color ropes and hadronic rescattering

THERMUS—A thermal model package for ROOT

Medium effects on charmonium production at ultrarelativistic energies available at the CERN Large Hadron Collider

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