Bose-Einstein correlation and two-body final-state interaction of dipion

The two-body final-state-interaction effect in the Bose-Einstein correlation analysis is estimated for like-sign and unlike-sign dipions. Within the experimental uncertainty of the s-wave ππ scattering phase shifts in the channel of isospin 2, removal of the strong ππ final-state interaction enhances the Bose-Einstein correlation signal by (${20}_{\mathrm{-}13}^{+5\mathrm{}}$)%. It is pointed out that the same Bose-Einstein correlation may be seen in ${\pi }^{\pm }$ ${\pi }^0$ production as well.