Bose-Einstein correlations inK+p and π+p at 250 GeV/c

Two-pion correlations are studied for pions of like charge inK+p andπ+p collisions at 250 GeV/c. An enhanced production is observed at small momentum difference and is attributed to Bose-Einstein interference between identical particles. A systematic study is presented on the influence of parametrization and reference sample. Interpreted in terms of the Kopylov-Podgoretskii parametrization a size of the emitting regionr K ≈1.4 fm is found. The Lorentz invariant parametrization of Goldhaber givesr G ≈0.8 fm. With fixed parametrization, similarity is found for hadronhadron,e+e− and lepton-hadron collisions. No multiplicity or angular dependence is found at our energy.