Indication of asymptotic scaling in the reactions $dd\to p^3$H, $dd\to n^3$He and $dp\to dp$

Abstract

It is shown that the differential cross sections of the reactions $dd{\to }^{3}Hen$ and $dd{\to }^{3}Hp$ measured at c.m.s.scattering angle${\theta }_{cm}=60^{\circ }$ in the interval of the deuteron beam energy 0.5 - 1.2 GeV demonstrate the scaling behaviour,$d\sigma /dt\sim s^{-22}$, which follows from constituent quark counting rules. It is found also that the differential cross section of the elastic $dp\to dp$ scattering at ${\theta }_{cm}=125^{\circ }-135^{\circ }$ follows the scaling regime $\sim s^{-16}$ at beam energies 0.5 - 5 GeV. These data are parameterized here using the Reggeon exchange.

Comments: 6 pages, Latex, 2 eps figures; final version accepted by Pis'ma v ZHETF, corrected and completed references