# Quantum statistics measurements using 2-, 3- and 4-pion Bose-Einstein correlations

- Institution: CERN
- Department: LHC Seminar
- Speaker: Dhevan Raja Gangadharan
- Year: 2014
- Language: English
- Subjects: Mathematics, Physics
- Source: [CERN](https://videos.cern.ch/record/3012916)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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. .

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## Lectures

1. [Quantum statistics measurements using 2-, 3- and 4-pion Bose-Einstein correlations](https://invisiblenetwork.ai/learn/cern/3012916/f9c0de283938), 47 min (CERN's player)