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Title: Femtoscopy: Theory

Abstract

The theoretical basics of correlation femtoscopy, recent results from femtoscopy in relativistic heavy ion collisions and their consequences are shortly reviewed.

Authors:
 [1];  [2]
  1. Institute of Physics ASCR, Na Slovance 2, 18221 Prague 8 (Czech Republic)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
20800114
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 828; Journal Issue: 1; Conference: 35. internationals symposium on multiparticle dynamics; Workshop on particle correlations and femtoscopy, Kromeriz (Czech Republic), 9-17 Aug 2005; Other Information: DOI: 10.1063/1.2197450; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CORRELATIONS; HEAVY ION REACTIONS; MULTIPLE PRODUCTION; PARTICLE INTERACTIONS; RELATIVISTIC RANGE

Citation Formats

Lednicky, Richard, and Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980. Femtoscopy: Theory. United States: N. p., 2006. Web. doi:10.1063/1.2197450.
Lednicky, Richard, & Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980. Femtoscopy: Theory. United States. doi:10.1063/1.2197450.
Lednicky, Richard, and Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980. Tue . "Femtoscopy: Theory". United States. doi:10.1063/1.2197450.
@article{osti_20800114,
title = {Femtoscopy: Theory},
author = {Lednicky, Richard and Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980},
abstractNote = {The theoretical basics of correlation femtoscopy, recent results from femtoscopy in relativistic heavy ion collisions and their consequences are shortly reviewed.},
doi = {10.1063/1.2197450},
journal = {AIP Conference Proceedings},
number = 1,
volume = 828,
place = {United States},
year = {Tue Apr 11 00:00:00 EDT 2006},
month = {Tue Apr 11 00:00:00 EDT 2006}
}
  • Analyses of two-particle correlations have provided the chief means for determining spatio-temporal characteristics of relativistic heavy ion collisions. We discuss the theoretical formalism behind these studies and the experimental methods used in carrying them out. Recent results from RHIC are put into context in a systematic review of correlation measurements performed over the past two decades. The current understanding of these results are discussed in terms of model comparisons and overall trends.
  • We investigate the role of lifetime effects from resonances and emission duration tails in femtoscopy at RHIC in two Blast-Wave models. We find the non-Gaussian components compare well with published source imaged data, but the value of R{sub out} obtained from Gaussian fits is not insensitive to the non-Gaussian contributions when realistic acceptance cuts are applied to models.
  • The STAR Collaboration at the BNL Relativistic Heavy Ion Collider has measured two-pion correlation functions from p+p collisions at {radical}s = 200 GeV. Spatial scales are extracted via a femtoscopic analysis of the correlations, though this analysis is complicated by the presence of strong nonfemtoscopic effects. Our results are put into the context of the world data set of femtoscopy in hadron-hadron collisions. We present the first direct comparison of femtoscopy in p+p and heavy ion collisions, under identical analysis and detector conditions.
  • We report on the high statistics two-pion correlation functions from pp collisions at {radical}s = 0.9 TeV and {radical}s = 7 TeV, measured by the ALICE experiment at the Large Hadron Collider. The correlation functions as well as the extracted source radii scale with event multiplicity and pair momentum. When analyzed in the same multiplicity and pair transverse momentum range, the correlation is similar at the two collision energies. A three-dimensional femtoscopic analysis shows an increase of the emission zone with increasing event multiplicity as well as decreasing homogeneity lengths with increasing transverse momentum. The latter trend gets more pronouncedmore » as multiplicity increases. This suggests the development of space-momentum correlations, at least for collisions producing a high multiplicity of particles. We consider these trends in the context of previous femtoscopic studies in high-energy hadron and heavy-ion collisions and discuss possible underlying physics mechanisms. Detailed analysis of the correlation reveals an exponential shape in the outward and longitudinal directions, while the sideward remains a Gaussian. This is interpreted as a result of a significant contribution of strongly decaying resonances to the emission region shape. Significant nonfemtoscopic correlations are observed, and are argued to be the consequence of 'mini-jet'-like structures extending to low p{sub t}. They are well reproduced by the Monte-Carlo generators and seen also in {pi}{sup +}{pi}{sup -} correlations.« less