Finite size of hadrons and Bose-Einstein Correlations

TL;DR

This paper explains why Bose-Einstein correlation functions for hadrons can fall below 1, attributing it to the finite size of hadrons and their space-time correlations, which was previously unexplained.

Contribution

It introduces a novel explanation for the sub-unity Bose-Einstein correlations based on the finite size and composite nature of hadrons.

Findings

Correlation functions can be less than 1 due to hadron size effects

The observed data from LEP and LHC support the finite size correlation model

The model explains the unexpected suppression in correlation functions

Abstract

In this presentation I report on the results of the paper we published recently together with Kacper Zalewski. It exploits the consequences of the observation that the hadrons, being the composite objects, cannot be produced too close to each other and thus must be correlated in space-time. One of these consequences, which we discuss here, is that the correlation function need not be larger than 1 (as is necessary if the space-time correlations are absent). Since the data from LEP and from LHC do show that the correlation function falls below 1, the particles must be correlated and we show that our observation does explain this unexpected effect.