Rapidity dependence of HBT radii based on a hydrodynamical model

Morita, Kenji

doi:10.1590/s0103-97332007000600022

Cited by 9 publications

(8 citation statements)

References 39 publications

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“…If this phase lasts long enough compared to the inverse of the width, the charmonia can decay in the medium. In fact, the lifetime of the partonic medium is about 4-5 fm/c in a hydrodynamic calculation for the central Au+Au collisions at the maximum RHIC energy [48]. This will be much longer at LHC.…”

Section: Discussion and Summarymentioning

confidence: 99%

Critical behavior of charmonia across the phase transition: A QCD sum rule approach

Morita

Lee

2008

Phys. Rev. C

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We investigate the medium-induced change of mass and width of J /ψ and η c across the phase transition in hot gluonic matter using QCD sum rules. In the QCD sum rule approach, the medium effect on heavy quarkonia is induced by the change of both scalar and twist-2 gluon condensates, whose temperature dependencies are extracted from the lattice calculations of energy density and pressure. Although the stability of the operator product expansion side seems to break down at T > 1.06T c for the vector channel and T > 1.04T c for the pseudoscalar channel, we find a sudden change of the spectral property across the critical temperature T c , which originates from an equally rapid change of the scalar gluon condensate characterized by ε − 3p. By parametrizing the ground state of the spectral density by the Breit-Wigner form, we find that for both J /ψ and η c , the masses suddenly decrease maximally by a few hundreds of MeV and the widths broaden to ∼100 MeV slightly above T c . The implications for recent and future heavy-ion experiments are discussed. We also carry out a similar analysis for charmonia in nuclear matter, which could serve as a testing ground for observing the precursor phenomena of the QCD phase transition. We finally discuss the possibility of observing the mass shift at nuclear matter at the FAIR project at GSI.

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Section: Discussion and Summarymentioning

confidence: 99%

Critical behavior of charmonia across the phase transition: A QCD sum rule approach

Morita

Lee

2008

Phys. Rev. C

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“…These studies can describe transverse momentum spectra and the elliptic flow of produced particles. On the other hand, Hanbury Brown-Twiss (HBT) correlations between identical particles cannot be accounted for [27,39,40,41]. In the present paper we investigate 3 + 1D hydrodynamic expansion of the fireball and show that a simultaneous and satisfactory description of the particle spectra and elliptic flow (for a broad range of rapidities) as well as of the HBT radii for central rapidities can be achieved.…”

Section: Introductionmentioning

confidence: 88%

Rapid hydrodynamic expansion in relativistic heavy-ion collisions

Božek

Wyskiel

2009

Phys. Rev. C

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Hydrodynamic expansion of the hot fireball created in relativistic Au-Au collisions at √ s = 200GeV in 3 + 1-dimensions is studied. We obtain a simultaneous, satisfactory description of the transverse momentum spectra, elliptic flow and pion correlation radii for different collision centralities and different rapidities. Early initial time of the evolution is required to reproduce the interferometry data, which provides a strong indication of the early onset of collectivity. We can also constraint the shape of the initial energy density in the beam direction, with a relatively high initial energy density at the center of the fireball.

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“…From Eq. (20), the velocity of sound is given by dp dε = c 0 , for 0 < ω < ω c , c s , for ω c < ω < ω f .…”

Section: Hydrodynamical Model Including Phase Transition a Intrmentioning

confidence: 99%

“…In the computer simulations at 200 AGeV, the fluid element expands a few hundred fm along the direction of colliding nuclei before freeze-out though the value of τ at freeze-out is about 15 fm/c or so [20].…”

Section: Single Particle Rapidity Distributionmentioning

confidence: 99%