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Quantum statistics correlations are sensitive to the space-time size of the particle-emitting source as well as to the degree of quantum coherence in the final state.
Coherent pion radiation in high-energy collisions may arise, for instance, from the formation of a disoriented chiral condensate.The coherence of pions is expected to suppress Bose-Einstein correlations. The amount of suppression increases for higher order correlations. The comparison of 2-, 3-, and 4-pion correlations allows for a less ambiguous measure of the coherent fraction.
The coherent fractions extracted by ALICE are found to be non-zero in Pb-Pb collisions, which challenges the hydrodynamic descriptions of the collision.
We also present measurements of the source radii with 3-pion Bose-Einstein cumulants in pp, p-Pb, and Pb-Pb collisions. The resulting comparisons of the radii in all three systems at similar multiplicity has implications on the hydrodynamic modeling of high-energy collisions.
M. Mangano, C. Lourenco, G. Unal......................... Tea and Coffee will be served at 10h30