Bose-Einstein Correlations In E(+)E(-) Annihilation In The Upsilon (1s) And Continuum

Bose-Einstein correlations in direct Upsilon(1S) decays and continuum in the energy region root s = 7.2-10.3 GeV have been studied using data taken with the MD-1 detector at VEPP-4 storage ring. Assuming gaussian density of the pion source the data indicate the radius of the source tau = 0.73 +/- 0.10 +/- 0.04 fm for direct Upsilon(1S) decays and tau = 0.83 +/- 0.22 +/- 0.05 fm for the continuum. The correlation strengths lambda for both data samples also are similar. Thus Bose-Einstein correlations do not reveal a noticeable difference between quark and gluon fragmentation.