The new results on three-pion Bose-Einstein correlations measured with the sample of proton-proton collisions recorded at a centre-of-mass energy of s = 7 TeV are presented, being the first study of three-particle Bose-Einstein correlations in the forward region provided by the LHCb detector. The results are interpreted within the core-halo model for the first time in proton-proton collisions. Together with previous LHCb results on two-pion Bose–Einstein correlation, s measured for the first time in the forward rapidity region at LHC energies, this confirms the observation of collective phenomena in small collision systems. Moreover, the results of the three-particle analysis indicate, for the first time, coherent particle emission.
Miłosz Zdybał (Mon,) studied this question.