Transverse flow and collectivity in ultrarelativistic heavy-ion collisions

Amelin, N.S.; Staubo, E.F.; Csernai, L.P.; Тонеев, В.Д.; Gudima, K. K.; Strottman, D.

doi:10.1103/physrevlett.67.1523

Cited by 102 publications

(69 citation statements)

References 17 publications

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“…If the center-of-mass energy of the interacting partons is greater than √ŝ min then the partons interact via the hard interactions, Eqs. (10)(11)(12), and if the center-of-mass energy is less than √ŝ min they interact via the soft interaction, Eq. (13).…”

Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

“…For the hard scattering, we generate a random scattering angle chosen with a weight given by the appropriate cross section in Eqs. (10)(11)(12) and then numerically scatter the partons through the appropriate angle. For the soft scattering, we generate a random momentum transfer with a weight given by Eq.…”

Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

“…The string-parton model is different in some essential ways from models based on the ideas of the classical string that use collision generator concepts, the (LUND [7], FRITIOF [8], RQMD [9], and QGSM [10]) models. The strings in the DSP model are not longitudinal; they are evolved according to the dynamics of the underlying Lagrangian.…”

Section: Introductionmentioning

confidence: 99%

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Relativistic heavy-ion collisions in the dynamical string-parton model

et al. 2001

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We develop and extend the dynamical string parton model. This model, which is based on the salient features of QCD, uses classical Nambu-Gotō strings with the endpoints identified as partons, an invariant string breaking model of the hadronization process, and interactions described as quark-quark interactions. In this work, the original model is extended to include a phenomenological quantization of the mass of the strings, an analytical technique for treating the incident nucleons as a distribution of string configurations determined by the experimentally measured structure function, the inclusion of the gluonic content of the nucleon through the introduction of purely gluonic strings, and the use of a hard parton-parton interaction taken from perturbative QCD combined with a phenomenological soft interaction. The limited number of parameters in the model are adjusted to e + e − and p -p data. Utilizing these parameters, the first calculations of the model for p -A and A-A collisions are presented and found to be in reasonable agreement with a broad set of data. 25.75.+r, 12.38.Mh

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Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

Section: Quark and Gluon Interactions And P -P Collisionsmentioning

confidence: 99%

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Relativistic heavy-ion collisions in the dynamical string-parton model

et al. 2001

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“…Directed flow has therefore been proposed as a measure for the pressure and a possible "softening" of the EoS [6,9]. Fig.…”

Section: Directed Flow and Softest Point Of The Eosmentioning

confidence: 99%

On the observation of phase transitions in collisions of elementary matter

Paech¹,

Reiter²,

Dumitru³

et al. 2001

Nuclear Physics A

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We investigate the excitation function of directed flow, which can provide a clear signature of the creation of the QGP and demonstrate that the minimum of the directed flow does not correspond to the softest point of the EoS for isentropic expansion. A novel technique measuring the compactness is introduced to determine the QGP transition in relativistic-heavy ion collisions: The QGP transition will lead to higher compression and therefore to higher compactness of the source in coordinate space. This effect can be observed by pion interferometry. We propose to measure the compactness of the source in the appropriate principal axis frame of the compactness tensor in coordinate space. MotivationThe primary goal for the investigation of heavy-ion collisions is to test the equation of state (EoS) of hot and dense matter far off the ground state, especially with view on possible phase transitions, e.g. to the Quark-Gluon-Plasma (QGP) [1]. Indeed, collective flow phenomena are sensitive indicators for thermodynamically abnormal matter [2]. In the case of a first-order phase transition to a QGP, an isentropic expansion proceeds through a stage of phase coexistence which should lead to signatures in the observables. The first ideas to investigate this phenomenon occured in the mid-seventies [3]. In this paper we investigate the excitation function of directed flow, as well as the compactness in heavy-ion collisions. ModelTo investigate quantitatively the experimental observables, we perform 1-fluid and 3-fluid (3+1)-dimensional relativistic hydrodynamic calculations. That is, we solve numerically the continuity equations for the energy-momentum tensor, ∂ µ T µν = 0, and the net baryon current, ∂ µ N µ B = 0. Detailed discussions of (3+1)-d numerical solutions for hydrodynamical compression and expansion can be found e.g. in [4]. We shall employ two * Invited speaker at CRIS 2000, 3rd Catania Relativistic Ion Studies,

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“…At present, the expansion of highly compressed nuclear mater in the direction perpendicular to the beam axis of the colliding heavy ions, known as collective flow, is believed to be one of the most promising signals to detect the creation of the QGP [1,2,3]. Since the development of flow is closely related to the equation of state (EOS) of nuclear matter, the investigation of the flow can shed light on the transition to the QGP phase accompanied by its subsequent hadronization [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. If the transition from the QGP to hadronic phase is of first order, the vanishing of the pressure gradients in the mixed phase leads to the so-called softening of the EOS [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of anisotropic flow in relativistic heavy ion collisions

Zabrodin

2004

Progress in Particle and Nuclear Physics

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Abstract. Anisotropic flow of hadrons is studied in heavy ion collisions at SPS and RHIC energies within the microscopic quark-gluon string model. The model was found to reproduce correctly many of the flow features, e.g., the wiggle structure of direct flow of nucleons at midrapidity, or centrality, rapidity, and transverse momentum dependences of elliptic flow. Further predictions are made. The differences in the development of the anisotropic flow components are linked to the freeze-out conditions, which are quite different for baryons and mesons.

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Transverse flow and collectivity in ultrarelativistic heavy-ion collisions

Cited by 102 publications

References 17 publications

Relativistic heavy-ion collisions in the dynamical string-parton model

Relativistic heavy-ion collisions in the dynamical string-parton model

On the observation of phase transitions in collisions of elementary matter

Microscopic description of anisotropic flow in relativistic heavy ion collisions

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