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Adam, J.; Adamova, D.; Aggarwal, M.M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter; Ljunggren, Martin; Oskarsson, Anders; Richert, Tuva; Silvermyr, David; Sogaard, Carsten; Stenlund, Evert; Vislavicius, Vytautas
Physical review. C, 05/2016, Volume: 93, Issue: 5Journal Article
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. © 2016 CERN.
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