Analysis of Bose-Einstein correlations in e~+e~-→ W~+W~- events including final state interactions

摘要

Recently DELPHI Collaboration reported new data on Bose-Einstein correlations (BEC) measured in e~+e~- →W~+W~- events. Apparently no enhancement has been observed. We have analyzed these data including final state interactions (FSI) of both Coulomb and strong (s-wave) origin and found that there is enhancement in BEC but it is overshadowed by the FSI which are extremely important for those events. We have found the following values for the size of the interaction range β and the degree of coherence λ, β = 0.87 ± 0.31 fm and λ = 1.19 ± 0.48, respectively.