Two- and three-particle femtoscopy in small collision systems at LHCb

The new results on three-pion Bose-Einstein correlations measured with the sample of proton-proton collisions recorded at LHCb will be presented, being the first study of three-particle Bose-Einstein correlations measured 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 correlations measured for the first time in the forward rapidity region at LHC energies, it confirms the observation of collective phenomena in the small collision systems. Furthermore, for the first time the coherent particle emission is observed.