Fermi-Dirac Correlations in Z^{0} \to ppX at LEP

TL;DR

This paper discusses recent measurements of quantum statistical correlations among hadrons produced in Z^0 decays at LEP, revealing a dependence of source size on hadron mass and exploring theoretical explanations.

Contribution

It presents new experimental results on Fermi-Dirac and Bose-Einstein correlations from LEP, highlighting the mass dependence of the source radius and discussing theoretical interpretations.

Findings

Proton source radius R ~ 0.1 fm

Source dimension for K^0_s K^0_s agrees with previous K measurements

Correlation radius depends on hadron mass

Abstract

The DELPHI and ALEPH experiments have released new results of the Fermi-Dirac correlations for pp (\bar{p} \bar{p}) and Bose-Einstein correlations for K^0_s K^0_s. Both experiments measure very small source radius for protons R \sim 0.1 fm. The source dimension for K^0_s K^0_s is in agreement with the previous measurements for K^+ K^-, K^0_s K^0_s. These results, together with earlier LEP measurements, establish the dependence of the correlation radius on the hadron mass. This paper discusses some of the attempts to describe this phenomenon.