Radiative width of the a {subscript 2} meson

We present data on coherent production of the ({pi}{sup +}{pi}{sup -}{pi}{sup -}) system by 600 GeV/c pion beam in the reaction {pi}{sup -} + A {yields} A + ({pi}{sup +}{pi}{sup -}{pi}{sup -}) for the C, Cu and Pb targets. The Primakoff formalism was used for extracting the radiative width of the a{sub 2} meson. We obtain a preliminary value {Gamma}(a{sub 2}{sup -} {yields} {pi}{sup -}{gamma}) = 225 {+-} 25(stat) {+-} 45(syst) keV.