Ultrarelativistic quantum molecular dynamics calculations of two-pion Hanbury-Brown–Twiss correlations in central Pb-Pb collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn></mml:mrow></mml:math>TeV

Li, Qingfeng; Gräf, Gunnar; Bleicher, Marcus

doi:10.1103/physrevc.85.034908

Cited by 22 publications

(4 citation statements)

References 27 publications

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“…Generally, one expects a strong damping of anisotropies through viscous evolution [29]. Angle averaged and azimuthally sensitive HBT radii have been calculated for a range of energies in the ultrarelativistic quantum molecular dynamics model [30,31]. In this paper we present the calculation of the azimuthally sensitive HBT radii for Au-Au collisions at 200 GeV and Pb-Pb collisions at 2.76 TeV within a 3 + 1 dimensional (3 + 1-D) viscous hydrodynamic model [32].…”

Section: Introductionmentioning

confidence: 99%

Azimuthally sensitive femtoscopy in event-by-event hydrodynamics

Božek

2014

Phys. Rev. C

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We analyze the pion femtoscopy correlations in noncentral Au-Au and Pb-Pb collisions. The azimuthally sensitive Hanbury Brown-Twiss (HBT) method is used to extract the interferometry radii depending on the azimuthal angle with respect to the second and third-order event plane. The results are in semiquantitative agreement with the STAR collaboration data on the HBT radii with respect to the second-order reaction plane, with the preliminary PHENIX collaboration data on the HBT radii with respect to the third-order reaction plane in Au-Au collisions at 200GeV, and with the preliminary ALICE collaboration data for the HBT radii with respect to the second-order event plane for Pb-Pb collisions at 2.76TeV

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Section: Introductionmentioning

confidence: 99%

Azimuthally sensitive femtoscopy in event-by-event hydrodynamics

Božek

2014

Phys. Rev. C

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“…The ultrarelativistic quantum molecular dynamics (UrQMD) model is a many-body micro-scopic transport model which has been widely applied to simulate HICs in a very broad energy range [51][52][53][54][55][56]. In the UrQMD model, each hardon is represented by the Gaussian wave packet in phase space.…”

Section: Urqmd Modelmentioning

confidence: 99%

Application of artificial intelligence in the determination of impact parameter in heavy-ion collisions at intermediate energies

Wang

Lü

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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The impact parameter is one of the crucial physical quantities of heavy-ion collisions, and can affect obviously many observables at the final state, such as the multifragmentation and the collective flow. Usually, it cannot be measured directly in experiments but might be inferred from observables at the final state. Artificial intelligence has had great success in learning complex representations of data, which enables novel modeling and data processing approaches in physical sciences. In this article, we employ two of commonly used algorithms in the field of artificial intelligence, the convolutional neural networks (CNN) and light gradient boosting machine (LightGBM), to improve the accuracy of determining impact parameter by analyzing the proton spectra in transverse momentum and rapidity on the event-by-event basis. Au + Au collisions with the impact parameter of 0 ⩽ b ⩽ 10 fm at intermediate energies (E lab = 0.2–1.0 GeV/nucleon) are simulated with the ultrarelativistic quantum molecular dynamics model to generate the proton spectra data. It is found that the average difference between the true impact parameter and the estimated one can be smaller than 0.1 fm. The LightGBM algorithm shows an improved performance with respect to the CNN on the task in this work. By using the LightGBM’s visualization algorithm, one can obtain the important feature map of the distribution of transverse momentum and rapidity, which may be helpful in inferring the impact parameter or centrality in heavy-ion experiments.

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“…It is successfully extended to describe HICs with beam energy starting from as low as several tens of MeV/per nucleon (low SIS) up to the highest one available at CERN Large Hadron Collider (LHC) [19][20][21].…”

Section: Model Descriptionmentioning

confidence: 99%

Effect of the spin-orbit interaction on flows in heavy-ion collisions at intermediate energies

Guo

Wang

et al. 2014

Phys. Rev. C

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The effect of the spin-orbit coupling in heavy ion collisions is investigated based on an updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, in which the Skyrme potential energy density functional is employed. And in particular, the spin-orbit coupling effects on the directed and elliptic flows of free nucleons emitted from 197 Au + 197 Au collisions as functions of both the beam energy and the impact parameter are studied. Our results show that the net contribution of the spin-orbit term to flows of nucleons is negligible, whereas a directed flow splitting between spin-up and spin-down nucleons is visible, especially at large impact parameters, and a peak of the splitting is found at the beam energy around 150 MeV/nucleon. We also found that the directed flow splitting between spin-up and spin-down neutrons is comparable with the neutron directed flow difference calculated by a soft and a stiff symmetry energy, indicating that the directed flow of neutrons cannot be used to pin down the stiffness of symmetry energy any more without considering the spin degree of freedom in models in the case of spin polarization.

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Ultrarelativistic quantum molecular dynamics calculations of two-pion Hanbury-Brown–Twiss correlations in central Pb-Pb collisions atsNN=2.76TeV

Abstract: are also compared to data from the STAR experiment at RHIC. For both energies we find that the calculated R O /R S ratio is always larger than data, indicating that the emission in the model is less explosive than observed in the data.

Cited by 22 publications

References 27 publications

Azimuthally sensitive femtoscopy in event-by-event hydrodynamics

Azimuthally sensitive femtoscopy in event-by-event hydrodynamics

Application of artificial intelligence in the determination of impact parameter in heavy-ion collisions at intermediate energies

Effect of the spin-orbit interaction on flows in heavy-ion collisions at intermediate energies

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