Effects of FSI, CR and BEC at Small Relative Momenta of Particles and W-mass Systematics at LEP

TL;DR

This paper reviews how Final State Interactions, Colour Reconnection, and Bose-Einstein Correlations affect particle behavior at small momenta and discusses their impact on W-mass measurements at LEP.

Contribution

It provides a comprehensive review of LEP results on BEC, FSI, and CR effects and their influence on W-mass systematics in electron-positron collisions.

Findings

LEP results show significant BEC effects at Z-peak.

Bose-Einstein correlations impact W-mass measurements.

CR and FSI effects influence particle correlations at small momenta.

Abstract

The effects of Final State Interactions(FSI), Colour Reconnection(CR) and Bose--Einstein Correlations(BEC) at small relative momenta of particles are discussed. The short review of the LEP results on BEC at Z-peak, on BEC between particles from different Ws in $e^+e^-\to W^+W^-$ events, and the W-mass systematics due to BEC is given