Evaluation of the moving cut contributions to the photoproduction of pseudoscalar mesons

Mechanisms of the reactionπ−p→a00(980)nAchasov1, Shestakov2 1997Phys. Rev. D125203340View full textAdd to dashboardCite

“…Notice that there realizes another type of conspiracy in the well known cases of the reactions γp → π + n and pn → np (in which the corresponding peaks in the forward direction are usually described in terms of the Regge cuts [19,25,27]) than in the reaction π − p → a 0 0 (980)n [12]. We have also obtained the estimates of the π − p → a 0 0 (980)n → π 0 ηn reaction cross section at P π − lab = 18 GeV/c and of the OPE contribution which can be caused by the f 0 0 (980)−a 0 0 (980) mixing.…”

“…The amplitude of the two-Reggeon cut associated with the R 1 and R 2 Regge pole exchanges can be calculated in the absorption model approximation by the formula [25][26][27]:…”

“…The calculation methods of the two-Reggeon cuts are well known (see, for example, Refs. [25][26][27]19,24]). Therefore, omitting details, we go at once to the discussion of the final results.…”

Models for High-Energy Processes

“…Mention should be made of the work in the Soviet Union, contemporary with our original work (Berkov, Nikitin, and Terent 'ev;1964) and subsequently (Kaidalov and Karnakov, 1966;Gribov, 1967a , ranges from 0.7 to 1.0, depending on the details of the couplings of the exchanged vector meson. In terms of Regge exchanges the reliability of these theorems will be especially poor when the "other" parity corresponds to Regge poles whose traj ectories lie higher (typically by half, , a unit) than those appropriate to the parity being measured.…”

“…(ii) Forward peaking in np -7 pn and pp -7 nn (Kaidalov and Karnakov, 1968): The II and p pole amplitudes vanish at t = 0;…”