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We develop an event mixing technique with a missing mass consistency (MMC)cut and a pion energy (PE) cut for the measurement of two-pion Bose-Einsteincorrelations (BEC) in reactions with only two identical pions produced in thefinal state. A multi mixing mode that allows one event to be mixed withmultiple other events is proposed for the purpose of improving the statisticsof mixed samples, and compared with the single mixing mode which requires oneoriginal event can be mixed only once. Numerical tests using the {\gamma}p ->{\pi}^0 {\pi}^0 p events are used to testify its ability to measure two-pioncorrelations. To improve the mixing speed, the optimal MMC cut window is alsoexplored via simulations.

A study of event mixing for two-pion Bose-Einstein correlations in the {\gamma}p -> {\pi}^0 {\pi}^0 p reaction