Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

Li, Qingfeng; Bleicher, Marcus; Stöcker, H.

doi:10.1088/0954-3899/34/3/012

Cited by 14 publications

(23 citation statements)

References 57 publications

(88 reference statements)

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“…This may be, at least partially, why the predictions from UrQMD more closely match the energy dependence of the data compared to the hydrodynamic predictions. While it does not explicitly contain a deconfined state, it does incorporate color For the azimuthally integrated results, UrQMD does rather well at predicting the observed dependence of HBT radii on k T and centrality [79,80]. As discussed earlier, inclusion of a mean field acting between pre-formed hadrons (color string fragments) predicts R out /R side ratios similar to the observed values and leads naturally to a minimum in the volume similar to that which is observed experimentally [72,73].…”

Section: Kinetic Freeze-out Eccentricitymentioning

confidence: 99%

Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2015

Phys. Rev. C

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We present results of analyses of two-pion interferometry in Au+Au collisions at √ s NN = 7.7, 11.5, 19.6,27,39, 62.4 and 200 GeV measured in the STAR detector as part of the RHIC Beam Energy Scan program. The extracted correlation lengths (HBT radii) are studied as a function of beam energy, azimuthal angle relative to the reaction plane, centrality, and transverse mass (m T ) of the particles. The azimuthal analysis allows extraction of the eccentricity of the entire fireball at kinetic freeze-out. The energy dependence of this observable is expected to be sensitive to changes in the equation of state. A new global fit method is studied as an alternate method to directly measure the parameters in the azimuthal analysis. The eccentricity shows a monotonic decrease with beam energy that is qualitatively consistent with the trend from all model predictions and quantitatively consistent with a hadronic transport model. 3PACS numbers: 25.75. Gz, 25.75.Nq

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Section: Kinetic Freeze-out Eccentricitymentioning

confidence: 99%

Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2015

Phys. Rev. C

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“…Only the negatively charged pions are considered during the analyzing process (for each analysis, one hundred million pion pairs are considered). For the cascade calculations, we take the results from our previous publications as reference [13,23]. We found that the residual Coulomb effect after the hadron freeze-out on the HBT radii of the pion source is small [25], therefore we omit it in the present analysis.…”

Section: Crab Analyzing Program and The Fitting Processmentioning

confidence: 99%

“…We concentrate here on the two (identical) pion interferometry and test the sensitivity of the HBT results on different stages of the evolution. In our previous investigations on the HBT correlation of various identical particle pairs from HICs at AGS, SPS, and RHIC energies [13,22,23,24,25,26], we adopted the UrQMD model but further considered the mean field potentials for both confined and "pre-formed" particles in the model [13,25,26]. We found that also initial stage interaction may contribute to a better description of the HBT time-related puzzle throughout the energies from AGS, SPS, up to RHIC.…”

Section: Introductionmentioning

confidence: 99%

Effects of a phase transition on HBT correlations in an integrated Boltzmann+hydrodynamics approach

Li¹,

Steinheimer²,

Petersen³

et al. 2009

Physics Letters B

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A systematic study of HBT radii of pions, produced in heavy ion collisions in the intermediate energy regime (SPS), from an integrated (3+1)d Boltzmann+hydrodynamics approach is presented. The calculations in this hybrid approach, incorporating an hydrodynamic stage into the Ultra-relativistic Quantum Molecular Dynamics transport model, allow for a comparison of different equations of state retaining the same initial conditions and final freeze-out. The results are also compared to the pure cascade transport model calculations in the context of the available data. Furthermore, the effect of different treatments of the hydrodynamic freeze-out procedure on the HBT radii are investigated. It is found that the HBT radii are essentially insensitive to the details of the freeze-out prescription as long as the final hadronic interactions in the cascade are taken into account. The HBT radii RL and RO and the RO/RS ratio are sensitive to the EoS that is employed during the hydrodynamic evolution. We conclude that the increased lifetime in case of a phase transition to a QGP (via a Bag Model equation of state) is not supported by the available data.

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“…5 (c)): The calculated values of R 2 O − R 2 S are about 3.5 ∼ 5 fm while the measured ones are 1.5 ∼ 4 fm. Many efforts have been put forward over the last years to clarify this issue [39,44,38,46,45,28,27,25]. Here, we show in Fig.…”

Section: Pos(cpod07)048mentioning

confidence: 74%

Pion freeze-out as seen through HBT correlations in HICs from FAIR/AGS to RHIC energies

Li¹

2008

Proceedings of Critical Point and Onset of Deconfinement - 4th International Workshop — PoS(CPOD07)

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In this talk we present the results of two-pion HBT correlation at freeze-out in heavy ion collisions (HICs) from AGS to RHIC energies. The UrQMD hadron-string transport model as well as the CRAB analyzing program are adopted. Based on the cascade mode, in general, the calculations are satisfying and well in line with the experimental data although discrepancies are not negligible. Such as: I), the HBT time-related puzzle exists at all energies. II), at low AGS energies, the calculated volume as well as the mean free path of pion source at freeze-out are lower than data. It implies that a better description of interactions of particles at early stage of HICs is required.

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Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies

Cited by 14 publications

References 57 publications

Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector

Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector

Effects of a phase transition on HBT correlations in an integrated Boltzmann+hydrodynamics approach

Pion freeze-out as seen through HBT correlations in HICs from FAIR/AGS to RHIC energies

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