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A joint analysis of the pi+pi- and pi0pi0 S-wave amplitudes including resultsof three experiments has been performed. Using our theoretical model of thepion-pion production in which not only the pion exchange but also the a1(1260)meson exchange were taken into account we have obtained a unique solution(called "down-flat") for the scalar-isoscalar phase shifts. Thus along-standing problem of ambiguities in the S-wave isoscalar amplitude has beenfinally resolved and the second ("up-flat") solution was eliminated.Comment: 4 pages, 1 figure, talk given at the Seventh Int. Workshop Meson  2002, Cracow, Poland, May 24-28, 200

A NEW ANALYSIS OF THE π+π- AND π0π0 DATA

A NEW ANALYSIS OF THE π⁺π^- AND π⁰π⁰ DATA