Bose-Einstein correlations in one and two dimensions in deep inelastic scattering

TL;DR

This study investigates Bose-Einstein correlations in deep inelastic scattering at HERA, revealing their independence from photon virtuality and showing a consistent source size unaffected by the hard scattering process.

Contribution

It provides the first detailed analysis of the two-dimensional shape of the particle-production source in deep inelastic scattering, highlighting the independence of Bose-Einstein correlations from Q2.

Findings

Correlations are independent of photon virtuality Q2.

No significant difference in correlations between current and target regions for Q2>100 GeV2.

The source has a larger transverse dimension compared to the longitudinal dimension, unaffected by Q2.

Abstract

Bose-Einstein correlations in one and two dimensions have been studied in deep inelastic EP scattering events measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The correlations are independent of the virtuality of the exchanged photon, Q2, in the range 0.1<Q2<8000 GeV2. There is no significant difference between the correlations in the current and target regions of the Breit frame for Q2>100 GeV2. The two-dimensional shape of the particle-production source was investigated, and a significant difference between the transverse and the longitudinal dimensions of the source is observed.This difference also shows no Q2 dependence.The results demonstrate that Bose-Einstein interference, and hence the size of the particle-production source, is insensitive to the hard subprocess.