Exchange mechanisms of hadronic reactions

Abstract

A general review of the theory and phenomenology of exchange mechanisms in hadronic reactions at all energies above the resonance region is presented. The main emphasis is on examining how far fairly simple theoretical ideas can be taken in obtaining a general understanding of high energy two-body reactions.

Evidence for the tensor meson exchange in the kaon photoproduction

“…Based on the dispersion relation and on the tensor meson dominance (TMD) [12] the f 2 N N coupling constants were investigated in the analysis of the backward πN scattering [13] and the ππ → NN partial-wave amplitudes [14,15]. In these analyses we first note that g (2) f2N N ≈ 0 was obtained in common and we adopt this in Eq. (8) together with g (2) a2N N ≈ 0 in accordance with our previous result [8].…”

Photoproduction ofZ(4430)through mesonic Regge trajectories exchange

“…Here a very brief and partial summary of the Regge theory is introduced, while for more general reviews see Refs. [9,12,13].…”

Tensor meson contribution to γp → K[sup +]Λ(Σ;[sup 0]) at high energies

“…In this work the exchange degeneracy (EXD) between the K * and K * 2 is assumed to be violated and the K * 2 contributes independently with the phase taken to be rotating in the Regge pole [1,5] …”

“…We choose g (1) a 2 NN = 1.4 from existing estimates [11,12] and g (2) a 2 NN = 0 for the consistency with g (2) f 2 NN = 0 by the conjecture of the tensor-meson dominance [13] as well as the phenomenological analysis [14]. The coupling constants adopted in the present work are listed in Table 1 together with those used in other model calculations for comparison.…”

“…It is known that the Regge formalism can serve to this purpose and the exchange of the spin quantum number carried by the meson trajectory could provide a most economic way for the description of high-energy phenomenologies [1].…”