First Measurement of Chiral Dynamics in π^- γ-> π^- π^- π^+

M. G. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov +202

The COMPASS collaboration at CERN has investigated the π^- γ-> π^- π^- π^+ reaction at center-of-momentum energy below five pion masses, sqrt(s) < 5 m(π), embedded in the Primakoff…