( TH ) and ( EXP ) SLAC - PUB - 887 March 1971 DOUBLE PARTICLE EXCHANGE IN HADRONIC REACTIONS

  • Hahn Hararit
  • Published 1971

Abstract

We show that; contrary to present practice and belief, double-particleexchange (DPE) contributions to hadronic scattering amplitudes are not negligible. We introduce a hierarchy of exchange mechanisms: (i) Pomeron; (ii) single pole exchange (including pole-Pomeron cuts); (iii) DPE; etc. The relative strength of any pair of consecutive terms in this hierarchy of amplitudes is of order 77 = no” -4 where vow 0.6 BeV#. At Y = 5 BeV, DPE amplitudes may contribute to 25%50% of the cross section for inelastic processes, and should not be ignored. Phenomenological studies of hadronic reactions at intermediate and high energies usually assume that the singIe particle exchange mechanism1 is dominant at these energies. The absence of important “exoticf? exchanges is usually considered as evidence for the smallness of the contributions of double particle exchange (or the Regge cuts generated by the exchange of two “ordinary” Regge poles). A typical parametrization of a hadronic amplitude at an energy of a few BeV’s normally involves a few single-pole terms and perhaps a cut generated by the Pomeron and an “ordinary’t pole (or some equivalent term such as an absorption. correction). Double particle exchange is almost always ignored, eveneat 3 or 4 BeV. * Supported in part by the U. S. Atomic Energy Commission. t On leave of absence from the Weizmann Institute, Rehovot, ISRAEL. (Submitted to Phys. Rev. Letters)

1 Figure or Table

Cite this paper

@inproceedings{Hararit1971T, title={( TH ) and ( EXP ) SLAC - PUB - 887 March 1971 DOUBLE PARTICLE EXCHANGE IN HADRONIC REACTIONS}, author={Hahn Hararit}, year={1971} }