Two-Pion Correlations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mi>u</mml:mi><mml:mo>+</mml:mo><mml:mi>A</mml:mi><mml:mi>u</mml:mi></mml:math>Collisions at 10.8 GeV/<i>c</i>per Nucleon

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

doi:10.1103/physrevlett.78.2916

Cited by 44 publications

(28 citation statements)

References 25 publications

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“…It is a very important issue to understand whether the system is able to reach full thermalization; up to now this question has been the subject of many experimental and theoretical studies. However several experimental observables, such as transverse mass spectrum, multiplicity of particles, three-dimensional phasespace density of pions, are well reproduced in the framework of local thermal equilibrium in a hydrodynamical expanding environment [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Non-extensive statistics, fluctuations and correlations in high-energy nuclear collisions

2000

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Starting from the experimental evidence that high-energy nucleus-nucleus collisions cannot be described in terms of superpositions of elementary nucleon-nucleon interactions, we analyze the possibility that memory effects and long-range forces imply a nonextensive statistical regime during high energy heavy ion collisions. The relevance of these statistical effects and their compatibility with the available experimental data are discussed. In particular we show that theoretical estimates, obtained in the framework of the generalized nonextensive thermostatistics, can reproduce the shape of the pion transverse mass spectrum and explain the different physical origin of the transverse momentum correlation function of the pions emitted during the central Pb+Pb and during the p+p collisions at 158 A GeV.

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Section: Introductionmentioning

confidence: 99%

Non-extensive statistics, fluctuations and correlations in high-energy nuclear collisions

2000

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“…Identical particle correlations have previously been used to determine source sizes and lifetimes of the emission regions formed in heavy-ion collisions [1,2,3,4]. In the case of non-central collisions, such measurements usually integrate over the reaction plane of the collision and therefore obscure physics which depends on the relative orientation of the two colliding nuclei.…”

Section: Introductionmentioning

confidence: 99%

Hbt Studies with E917 at the Ags: a Status Report

Holzman

1999

Advances in Nuclear Dynamics 5

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Two-particle correlations between pions in Au+Au collisions have been measured at beam kinetic energies of 6, 8, and 10.8 GeV/u at the Alternating Gradient Synchrotron (AGS) over a wide range of rapidities using a magnetic spectrometer. The data have been analyzed in the Hanbury-Brown and Twiss (HBT) framework to extract source parameters. The event-by-event orientation of the reaction plane has also been measured using a scintillator hodoscope at far forward rapidities, and beam vertexing detectors upstream of the target. A preliminary analysis of the dependence of the source parameters on the reaction plane is presented.

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“…The projectile energies were 200 GeV per nucleon in S-nucleus collisions, 158 GeV per nucleon in Pb-Pb collisions and 250 GeV in π-p collisions, which correspond to projectile rapidities 6, 5.8 and 8.2, respectively. Our results will also be compared with the average phase-space density in Au-Au collisions at projectile momentum 10.8 GeV/c, published by the E877 collaboration at the AGS [4]. In all cases the analysis was done in the LCMS (longitudinally comoving system) where the longitudinal momentum of the pion pair vanishes.…”

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confidence: 99%

“…where the subscripts o, s, l refer to the usual out-side-long coordinate system and λ(p T , y) accounts for unresolvable contributions from long-lived resonances [3], one obtains for the spatially averaged phase-space density at freeze-out [4,5] f (p T , y) = λ(p T , y)…”

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confidence: 99%

“…Here E p = √ m 2 +p 2 =m T cosh y, with m T = m 2 + p 2 T . The numerator (with experimental input dn − /dy, T eff (y)) gives the momentum-space density at freeze-out while the denominator (involving the measured two-pion Bose-Einstein correlation radii R s , R o , R l , R ol ) reflects the space-time structure of the source at freeze-out and can be interpreted as its covariant homogeneity volume for particles of momentum p. The factor √ λ ensures [4] that only the contributions of pions from the decays of short-lived resonances, which happen close to the primary production points, are included in the average phase-space density.…”

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confidence: 99%

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