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Title: Back-to-back correlations for finite expanding fireballs

Abstract

Back-to-back correlations of particle-antiparticle pairs are related to the in-medium mass-modification and squeezing of the quanta involved. They are predicted to appear when hot and dense hadronic matter is formed in high energy nucleus-nucleus collisions. The survival and magnitude of the back-to-back correlations (BBC) of boson-antiboson pairs generated by in-medium mass modifications are studied here in the case of a thermalized, finite-sized, spherically symmetric expanding medium. We show that the BBC signal indeed survives the finite-time emission, as well as the expansion and flow effects, with sufficient intensity to be observed at BNL Relativistic Heavy Ion Collider (RHIC)

Authors:
; ; ; ;  [1];  [2];  [3];  [3]
  1. Instituto de Fisica Teorica, Universidade Estadual Paulista, Rua Pamplona 145, 01405-900 Sao Paulo, SP (Brazil)
  2. (Hungary)
  3. (Brazil)
Publication Date:
OSTI Identifier:
20771472
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044906; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BOSONS; BROOKHAVEN RHIC; CORRELATIONS; EMISSION; FIREBALL MODEL; HADRONS; HEAVY ION REACTIONS; NUCLEAR MATTER

Citation Formats

Padula, Sandra S., Krein, G., Csoergo'', T., Hama, Y., Panda, P.K., MTA KFKI RMKI, H - 1525 Budapest 114, P.O. Box 49, Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05389-970 Sao Paulo, SP, and Departamento de Fisica-CFM, Universidade Federal de Santa Catarina, Caixa Postal 476, 88040-900 Florianopolis, SC. Back-to-back correlations for finite expanding fireballs. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044906.
Padula, Sandra S., Krein, G., Csoergo'', T., Hama, Y., Panda, P.K., MTA KFKI RMKI, H - 1525 Budapest 114, P.O. Box 49, Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05389-970 Sao Paulo, SP, & Departamento de Fisica-CFM, Universidade Federal de Santa Catarina, Caixa Postal 476, 88040-900 Florianopolis, SC. Back-to-back correlations for finite expanding fireballs. United States. doi:10.1103/PhysRevC.73.044906.
Padula, Sandra S., Krein, G., Csoergo'', T., Hama, Y., Panda, P.K., MTA KFKI RMKI, H - 1525 Budapest 114, P.O. Box 49, Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05389-970 Sao Paulo, SP, and Departamento de Fisica-CFM, Universidade Federal de Santa Catarina, Caixa Postal 476, 88040-900 Florianopolis, SC. Sat . "Back-to-back correlations for finite expanding fireballs". United States. doi:10.1103/PhysRevC.73.044906.
@article{osti_20771472,
title = {Back-to-back correlations for finite expanding fireballs},
author = {Padula, Sandra S. and Krein, G. and Csoergo'', T. and Hama, Y. and Panda, P.K. and MTA KFKI RMKI, H - 1525 Budapest 114, P.O. Box 49 and Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05389-970 Sao Paulo, SP and Departamento de Fisica-CFM, Universidade Federal de Santa Catarina, Caixa Postal 476, 88040-900 Florianopolis, SC},
abstractNote = {Back-to-back correlations of particle-antiparticle pairs are related to the in-medium mass-modification and squeezing of the quanta involved. They are predicted to appear when hot and dense hadronic matter is formed in high energy nucleus-nucleus collisions. The survival and magnitude of the back-to-back correlations (BBC) of boson-antiboson pairs generated by in-medium mass modifications are studied here in the case of a thermalized, finite-sized, spherically symmetric expanding medium. We show that the BBC signal indeed survives the finite-time emission, as well as the expansion and flow effects, with sufficient intensity to be observed at BNL Relativistic Heavy Ion Collider (RHIC)},
doi = {10.1103/PhysRevC.73.044906},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
  • Back-to-Back Correlations (BBC) of particle-antiparticle pairs are predicted to appear if hot and dense hadronic matter is formed in high energy nucleus-nucleus collisions. The BBC are related to in-medium mass-modification and squeezing of the quanta involved. Although the suppression of finite emission times were already known, the effects of finite system sizes and of collective phenomena had not been studied yet. Thus, for testing the survival and magnitude of the effect in more realistic situations, we study the BBC when mass-modification occurs in a finite sized, thermalized medium, considering a non-relativistically expanding fireball with finite emission time, and evaluating themore » width of the back-to-back correlation function. We show that the BBC signal indeed survives the expansion and flow effects, with sufficient magnitude to be observed at RHIC.« less
  • There are {ital two} {ital types} {ital of} {ital scales} present simultaneously in the spacelike as well as in the timelike directions in a model class describing a cylindrically symmetric, finite, three-dimensionally expanding boson source. One type of scale is related to the finite lifetime or geometrical size of the system, and the other type is governed by the rate of change of the local momentum distribution in the considered temporal or spatial direction. The parameters of the Bose-Einstein correlation function may obey an {ital M}{sub {ital t}} scaling, as observed in S+Pb and Pb+Pb reactions at CERN SPS. Thismore » {ital M}{sub {ital t}} scaling may imply that the Bose-Einstein correlation functions view only a small part of a large and expanding system. The full sizes of the expanding system at the last interaction are shown to be measurable with the help of the invariant momentum distribution of the emitted particles. A vanishing duration parameter can also be generated, with a specific {ital M}{sub {ital t}} dependence, in the considered model class. {copyright} {ital 1996 The American Physical Society.}« less
  • Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudo-rapidity range and full azimuth in Au+Au and p+p collisions at = {radical}s{sub NN} = 200 GeV. The small-angle correlations observed in p+p collisions and at all centralities of Au+Au collisions are characteristic of hard-scattering processes already observed in elementary collisions. A strong back-to-back correlation exists for p+p and peripheral Au + Au. In contrast, the back-to-back correlations are reduced considerably in the most central Au+Au collisions, indicating substantial interaction as the hard-scattered partons or their fragmentation products traverse the medium.