Refine
Year of publication
- 2016 (31) (remove)
Document Type
- Article (31) (remove)
Language
- English (31)
Has Fulltext
- yes (31)
Is part of the Bibliography
- no (31)
Keywords
- Centrality Class (1)
- Centrality Selection (1)
- Invariant Mass Distribution (1)
- Minimum Bias (1)
- Monte Carlo (1)
- Production Cross Section (1)
- Rapidity Range (1)
- Resolution Parameter (1)
- Systematic Uncertainty (1)
- Time Projection Chamber (1)
Institute
- Physik (31) (remove)
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.