"Recoil effects" in a model of higher baryon couplings. I. Photoproduction

Mehrotra, Rashmi ; Mitra, A. N. (1971) "Recoil effects" in a model of higher baryon couplings. I. Photoproduction Physical Review D - Particles, Fields, Gravitation and Cosmology, 4 (5). pp. 1409-1422. ISSN 1550-7998

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Official URL: http://link.aps.org/doi/10.1103/PhysRevD.4.1409

Related URL: http://dx.doi.org/10.1103/PhysRevD.4.1409


A recently proposed model (MM) of higher baryon couplings for P and V mesons is reformulated by reviewing the fuller possibilities of the "recoil term" in the primitive quark-meson interaction. While this introduces no basic change in the P-meson coupling structures, it yields an entirely new (L-1)-wave coupling of V mesons to J = L+12 baryons, which is capable of generating helicity-flip amplitudes. The advantage of this new coupling structure over the earlier one is demonstrated through the excellent reproduction of (i) the E1 angular distribution in Y*→Λγ decay and (ii) the appreciable magnitudes as well as energy variations of the asymmetry parameter ∑(θ) in pion photoproduction. In addition to a comparison of the two coupling structures (old and new), the present paper is also designed to study the role of still another parametric structure for the form factor - one which exhibits better convergence properties at higher energies than those discussed in MM. The additional processes studied in this connection are (i) η and X0 photoproduction at intermediate energies (> 2 GeV), (ii) polarization of the recoil proton in η and π photoproduction, and (iii) π0 photoproduction at high energies (∼ 6 GeV), in accordance with our earlier scheme of s-channel resonances. In connection with η photoproduction the roles of some pertinent I =12 resonances such as S11, P11, and G17 are discussed, especially in relation to supermultiplet assignments.

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