Comparison of the space-time extent of the pion emission source in d+Au and Au+Au collisions at √sN N = 200 GeV

Ajitanand, N. N. and Adare, A. and Afanasiev, S. and Aidala, C. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Ta'ani, H. and Alexander, J. and Alfred, M. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bai, X. and Baksay, G. and Csanád, Máté and Csörgő, Tamás and Imrek, József and Kiss, Árpád and Varga-Kőfaragó, Mónika and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vargyas, Márton and Vértesi, Róbert and Zimányi, József (2014) Comparison of the space-time extent of the pion emission source in d+Au and Au+Au collisions at √sN N = 200 GeV. NUCLEAR PHYSICS A, 931. pp. 1082-1087. ISSN 0375-9474

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Abstract

Two-pion interferometry measurements in d+Au and Au+Au collisions at √sNN = 200 GeV are used to extract and compare the Gaussian source radii Rout, Rside, and Rlong, which characterize the space-time extent of the emission sources. The comparisons, which are performed as a function of collision centrality and the mean transverse momentum for pion pairs, indicate strikingly similar patterns for the d+Au and Au+Au systems. They also indicate a linear dependence of Rside on the initial transverse geometric size ¯R, as well as a smaller freeze-out size for the d+Au system. These patterns point to the important role of final-state rescattering effects in the reaction dynamics of d+Au collisions.

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