Multipion Bose-Einstein correlations in pp, p-Pb, and Pb-Pb collisions at the LHC

Abstract : Three- and four-pion Bose-Einstein correlations are presented in pp, p-Pb, and Pb-Pb collisions at the LHC. We compare our measured four-pion correlations to the expectation derived from two- and three-pion measurements. Such a comparison provides a method to search for coherent pion emission. We also present mixed-charge correlations in order to demonstrate the effectiveness of several analysis procedures such as Coulomb corrections. Same-charge four-pion correlations in pp and p-Pb appear consistent with the expectations from three-pion measurements. However, the presence of non-negligible background correlations in both systems prevent a conclusive statement. In Pb-Pb collisions, we observe a significant suppression of three- and four-pion Bose-Einstein correlations compared to expectations from two-pion measurements. There appears to be no centrality dependence of the suppression within the 0-50% centrality interval. The origin of the suppression is not clear. However, by postulating either coherent pion emission or large multibody Coulomb effects, the suppression may be explained.
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Contributor : Sylvie Flores <>
Submitted on : Monday, January 4, 2016 - 10:25:40 AM
Last modification on : Wednesday, October 30, 2019 - 1:40:25 AM

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J. Adam, H. Borel, J. Castillo Castellanos, J.L. Charvet, A. Lardeux, et al.. Multipion Bose-Einstein correlations in pp, p-Pb, and Pb-Pb collisions at the LHC. Physical Review C, American Physical Society, 2016, 93, pp.054908. ⟨10.1103/PhysRevC.93.054908⟩. ⟨in2p3-01249942⟩

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