Directed flow and particle production in Au+Au collisions from experiment E877 at the AGS

Barrette, J.; Bellwied, R.; Bennett, S.; Bersch, R.; Braun‐Munzinger, P.; Chang, W. C.; Cleland, W.; Clemen, M.; Cole, Joanne; Cormier, T. M.; Dai, Y. S.; David, G.; Dee, J.; Dietzsch, O.; Drigert, M. W.; Hall, J. R.; Hemmick, T. K.; Herrmann, N.; Hong, B.; Johnson, S. C.; Kwon, Y.-J.; Lacasse, R.; Li, Q.; Ludlam, T.; Lukaszew, A.; Mark, S. K.; McCorkle, S.; Matheus, R.; Miśkowiec, D.; Murgatroyd, J. T.; O’Brien, E.; Panitkin, S.; Piazza, T.; Pollack, M.; Pruneau, C.; Rao, M. N.; Rosati, M.; Silva, N. C. da; Sedykh, S.; Sonnadara, D. U. J.; Stachel, J.; Starinsky, N.; Takagui, E. M.; Voloshin, S. A.; Vongpaseuth, T.; Wang, G.; Wessels, J. P.; Woody, C.; Xu, N.; Zhang, Y.; Zou, C.

doi:10.1016/0375-9474(95)00240-2

Cited by 29 publications

(20 citation statements)

References 11 publications

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“…Spectral distributions of high quality for protons and produced particles now exist [5][6][7][8][9][10] for heavy colliding systems both at AGS and SPS energy. In the following we will concentrate on the information on can glean from such spectra concerning stopping and, in particular, the presence or absence of collective features such as hydrodynamic flow.…”

Section: Spectral Distributionsmentioning

confidence: 99%

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Dynamics of ultra-relativistic nuclear collisions with heavy beams: An experimental overview

1998

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Section: Spectral Distributionsmentioning

confidence: 99%

“…The rapidity distribution of identified baryons has been measured over the full solid angle at AGS energy [6,7]. The distribution is approximately Gaussian in shape with a peak at central rapidity and a width significantly narrower than that observed for the system Si+Al, implying strong baryon stopping.…”

Section: Rapidity Distributions and Baryon Stoppingmentioning

confidence: 99%

Dynamics of ultra-relativistic nuclear collisions with heavy beams: An experimental overview

1998

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“…10. At SIS energies we extract the HBT radius from the average of the π + π + and π − π − HBT radii [29] by multiplying by the geometrical factor, R f = 5/3R rms ≃ 15fm. This radius is considerably larger than the one extracted from the Coulomb effects.…”

Section: Comparison To Hbt Analysesmentioning

confidence: 99%

Coulomb effects on particle spectra in relativistic nuclear collisions

Barz

Bondorf²,

Gaardhøje³

et al. 1998

Phys. Rev. C

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Abstract:Coulomb effects on π ± and K ± spectra in relativistic nuclear collisions are investigated. At collision energies around 1 GeV the ratio of π − to π + is enhanced several times at low transverse momenta but less at ultrarelativistic energies. We describe the ratios at SIS, AGS and SPS energies with simple analytic models as well as more elaborate numerical models incorporating the expansion dynamics. The Coulomb effect depends on the properties of the source after the violent collision phase and provides information on source sizes, freeze-out times, and expansion velocities.Comparison with results from HBT analyses are made. Predictions for π ± and K ± at RHIC and LHC energies are given.

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“…First, we will be comparing with the transverse momentum distributions at mid-rapidity where the impact of spherical asymmetry should be less important than near the fragmentation regions. Second, pion interferometry of central Au+Au collisions at the AGS [9] and of central Pb+Pb collisions at the SPS [10] both yield comparable values for the transverse and longitudinal radii at the time of pion freezeout or strong decoupling. These are about twice the radius of a cold gold or lead nucleus.…”

mentioning

confidence: 99%

Size of fireballs created in high energy heavy ion collisions as inferred from Coulomb distortions of pion spectra

1999

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We compute the Coulomb effects produced by an expanding, highly charged fireball on the momentum distribution of pions. We compare our results to data on Au+Au at 11.6 A GeV from E866 at the BNL AGS and to data on Pb+Pb at 158 A GeV from NA44 at the CERN SPS. We conclude that the distortion of the spectra at low transverse momentum and mid-rapidity can be explained in both experiments by the effect of the large amount of participating charge in the central rapidity region. By adjusting the fireball expansion velocity to match the average transverse momentum of protons, we find a best fit when the fireball radius is about 10 fm, as determined by the moment when the pions undergo their last scattering. This value is common to both the AGS and CERN experiments.

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Directed flow and particle production in Au+Au collisions from experiment E877 at the AGS

Cited by 29 publications

References 11 publications

Dynamics of ultra-relativistic nuclear collisions with heavy beams: An experimental overview

Dynamics of ultra-relativistic nuclear collisions with heavy beams: An experimental overview

Coulomb effects on particle spectra in relativistic nuclear collisions

Size of fireballs created in high energy heavy ion collisions as inferred from Coulomb distortions of pion spectra

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