Exotic exchange processes in K−p and π−p interactions at 4 GeV/c

Exchange mechanisms of hadronic reactions

“…The difficulty with the baryonium exchange model here is that the suppression mechanism does not appear to factorise, as it should in this model (Irving et a1 1981). The Regge-Regge cut model in fact gives a reasonable estimate of the 0-i' final states: the problem here is that its predictions for all of the other final states are much too low (Irving et a1 1981).…”

“…There are other theoretical reasons for the existence of such states ( Q 3.5). The experimental evidence for their existence has fluctuated wildly (Benkheiri et a1 1977, Ajaltouni et a1 1982, and is not yet settled (Particle Data Group 1986) though there is also some evidence for the exchange of these states (Nicolescu 1978, Irving et a1 1981) which we will be discussing in Q 3.5.…”

“…The resonance production cross sections are free (Holmgren et a1 1977, Aguilar-Benitez et a1 1980) of the kinematic reflections which can simulate a peak in an exotic exchange reaction (Berger 1969, Berger andMorrow 1970). The suppression of the O-$+ reactions presents problems for the baryonium and Regge-Regge cut models, although in the former some, though not enough, degree of suppression can be achieved by mass dependent effects predicted by triple-Regge arguments (see PO 4.1 and 4.3) and SU( 6) arguments (Nicolescu 1978, Irving et a1 1981. The difficulty with the baryonium exchange model here is that the suppression mechanism does not appear to factorise, as it should in this model (Irving et a1 1981).…”

“…The suppression of the O-$+ reactions presents problems for the baryonium and Regge-Regge cut models, although in the former some, though not enough, degree of suppression can be achieved by mass dependent effects predicted by triple-Regge arguments (see PO 4.1 and 4.3) and SU( 6) arguments (Nicolescu 1978, Irving et a1 1981. The difficulty with the baryonium exchange model here is that the suppression mechanism does not appear to factorise, as it should in this model (Irving et a1 1981). The Regge-Regge cut model in fact gives a reasonable estimate of the 0-i' final states: the problem here is that its predictions for all of the other final states are much too low (Irving et a1 1981).…”