Bose-Einstein correlations in one and two dimensions have been studied, with high statistics, in charged current muon-neutrino interaction events collected with the NOMAD detector at CERN. In one dimension the Bose-Einstein effect has been analyzed with the Goldhaber and the Kopylov-Podgoretskii phenomenological parametrizations. The Goldhaber parametrization gives the radius of the pion emission region RG=1.01±0.05(stat) +0.09-0.06(sys) fm and for the chaoticity parameter the value λ=0.40±0.03(stat)+0.01 -0.06(sys). Using the Kopylov-Podgoretskii parametrization yields RKP=2.07±0.04(stat)+0.01 -0.14(sys) fm and λKP=0.29±0.06 (stat)+0.01-0.04(sys). Different parametrizations of the long-range correlations have been also studied. The two-dimensional shape of the source has been investigated in the longitudinal comoving frame. A significant difference between the transverse and the longitudinal dimensions is observed. The high statistics of the collected sample allowed the study of the Bose-Einstein correlations as a function of rapidity, charged particle multiplicity and hadronic energy. A weak dependence of both radius and chaoticity on multiplicity and hadronic energy is found.
ASJC Scopus subject areas
- Nuclear and High Energy Physics