Bose-Einstein Correlations in Deep Inelastic ep Scattering at HERA

TL;DR

This paper investigates Bose-Einstein correlations in deep inelastic ep scattering at HERA, revealing insights into hadronic source dimensions and comparing experimental data with QCD models across different scattering regimes.

Contribution

It presents the first separate analysis of Bose-Einstein correlations for diffractive and non-diffractive scattering in deep inelastic ep collisions at HERA.

Findings

Observed enhancement of like-sign correlations at low invariant masses.

Source radii are similar to those in lower energy lepton-nucleon and e+e- collisions.

Data agree with string-fragmentation QCD models.

Abstract

Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign charged particles produced in deep inelastic positron-proton scattering in a new kinematical domain. The data were taken with the H1 detector at the HERA storage ring in 1994, in which 27.5 GeV positrons collided with 820 GeV protons at a centre of mass energy sqrt{s}=300 GeV. The observed enhancement of the like-sign correlations at low invariant masses is related to the dimensions of the hadronic source. The data are compared to different QCD models where the hadronization is performed with the string-fragmentation model. Results are presented for the first time separately for diffractive and non-diffractive scattering, in domains of four-momentum transfer, Bjorken-x, and hadronic center of mass energy, and in intervals of charged particle multiplicity. The observed source radii do not differ strongly from those measured in lower energy lepton-nucleon inelastic scattering, and e^+e^- annihilation.