Experimental Study of the Radiative Scattering PI-P-]PI-P-gamma at 43 GEV

The pion radiative scattering (x-p + x-py) has been studied at 43 GeV in the interval 0.2 lt, l 0.4 (GeV/c)2 of the momentum transfer squared to the proton and in the range of photon energy 2 < w < 40 GeV. Calculations based on Low theorem agree well with measured w, t, and m, (final xy-invariant mass) differential cross-sections. The results obtained extend the validity of Low approach to the radiative scattering at high energies

Direct Observation of PI-2(1680) in the RHO-0-PI-System

In the reaction of x- dissociation into a p+p-z'- system on a Cu nucleus, a clear enhancement in the poz- effective-mass distribution has been observed in the 1;2( 1680) region. Partial-wave analysis shows that this enhancement is due to the P-wave and has a resonant nature. Coherent and incoherent cross-sections for this enhancement have been measured