Source radii at target rapidity from two-proton and two-deuteron correlations in central Pb+Pb collisions at 158 A GeV

2007/09/16 by WA Collaboration, WA98 Collaboration, M. M. Aggarwal +1
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #nucl-ex

paper · pdf · doi:10.48550/arxiv.0709.2477

13 pages, 15 figures

arxiv created 2007/09/16 · openalex publication_date 2007/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Two-proton and two-deuteron correlations have been studied in the target fragmentation region of central Pb+Pb collisions at 158 A GeV. Protons and deuterons were measured with the Plastic Ball spectrometer of the WA98 experiment at the CERN SPS. The results of one-dimensional and multi-dimensional analyses using both the Bertsch-Pratt and Yano-Koonin-Podgoretsky parameterizations of the two-particle correlation functions are presented. The proton source exhibits a volume emission, while the deuteron source, with small outward radius, appears opaque. Both proton and deuteron sources have cross-terms R_ol² and longitudinal velocities beta consistent with zero, indicating a boost-invariant expansion. The invariant radius parameter R follows an approximate A/sqrtm scaling while the longitudinal and transverse radii, R_L and R_T, scale approximately as A/sqrtm_T with A ~ 3 fm GeV^1/2 in both cases.

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