Regge models of forward pion and eta photoproduction
Feb 1, 197260 pages
Published in:
- Nucl.Phys.B 37 (1972) 253-312
- Published: Feb 1, 1972
Citations per year
Abstract: (Elsevier)
A Regge absorption model is presented which fits all pion and eta photoproduction data for |; t |; < 1, which fits the photoproduction FESR, and uses Regge residues in agreement with all constraints. The model uses poles with NWS zeroes, and uses a black disc form of absorption in which low partial waves was completely absorbed. The absorbed Regge amplitudes show remarkable ϱ − A 2 and π − B exchange degeneracy, and agree well with the FESR, which are written for regularized s -channel helicity amplitudes in order to examine their absorption zero structure. We also examine models using a conventional form of absorption, and models in which the poles do not have NWS zeroes. We find that models without NWS zeroes can fit the high energy data, but are unable to fit the sum rules. Since Regge absorption models do not fit the distinctive large- t behaviour of the cross sections, we discuss fixed-pole models as a possible explanation of these data, and show that even in fixed pole models, some Regge cuts are necessary. We present are predictions of the various models for some new experimental quantities which can be measured using simultaneously polarized targets and beams, and suggest a test for A 1 exchange.- regge poles
- pi: photoproduction
- photoproduction: pi
- eta(549): photoproduction
- photoproduction: eta(549)
- sum rule: finite energy
- model: absorption
- absorption: model
- model: regge cut
- model: exchange degeneracy
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