Deformation of the mass spectrum of hadronic system in coherent production on deuteron

Proposed is a phenomenological model of the production of unstable hadronic system on deuteron. The model takes into consideration the transitions in continuous spectrum of the hadronic system. The (γ, rho0) and (π, 3π) processes using the Kolbig and Margolis models are considered. It is shown, that the mass spectrum produced by the hadronic system at the fixed production angle is the most sensitive characterstic to the transition effect under consideration. However the cross section integrated over the effective mass does not permit to detect these transitions. To investigate them it is necessary to measure the mass spectrum of the hadronic system in the region of double collisions. The width of the ω(m', m) function distribution is estimated, when the effect is not manifests itself in the dσ/dΩ differential cross section. At N = 1 (where N is the ratio of the ω distribution width to the width in the production spectrum) the mass spectrum broadening on deuteron in comparison with that on nucleon reaches 30% for the (γ, rho0) process and 15% for the (π, 3π) process at large transferred momenta q and at the Gauss parametrization ω(m', m)