Bose-Einstein correlations between identical particles are measured in samples of proton-proton collisions at 0.9 and 7 TeV centre-of-mass energies, recorded by the CMS experiment at the LHC. The signal is observed in the form of an enhancement of number of pairs of same-sign charged particles with small relative momentum. The dependence of this enhancement on kinematic and topological features of the event is studied.
CMS Collaboration, Quertenmont, L., Khachatryan, V., Basegmez, S., Bruno, G., Caudron, J., Ceard, L., Cortina Gil, E., de Favereau de Jeneret, J., Delaere, C., Favart, D., Giammanco, A., Grégoire, G., Hollar, J., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Ovyn, S., et al. (2011). Measurement of Bose-Einstein Correlations in pp Collisions at sqrt(s)=0.9 and 7 TeV. Journal of High Energy Physics, 5(29), 29. https://doi.org/10.1007/JHEP05(2011)029 (Original work published 2011)