Fixed poles in Compton amplitudes, and the pomeranchukon coupling
19727 pages
Published in:
- Phys.Rev.D 5 (1972) 2056-2062
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Abstract: (APS)
The nonperturbative formulation of the parton model is used to discuss the Regge properties of current amplitudes at fixed q2. It is shown that, in addition to j=1 wrong-signature fixed poles due to third-spectral-function effects, there are further poles of this type associated with current-algebra anticommutators. The two types of poles combine additively with each other and multiplicatively with even-signature Regge poles. Their consequences for the coupling of the Pomeranchukon, for gauge invariance, and for deep-inelastic scattering are investigated. In particular, it is found that the coupling of the Pomeranchukon in the total cross section for photoproduction arises solely from the third-spectral-function effects and not from the current-algebra fixed pole; hence it cannot be calculated with present knowledge. The existence of a right-signature j=0 fixed pole with residue linear in q2 is also confirmed.- compton scattering
- model: fixed pole
- pomeron
- postulated particle: parton
- current algebra
- invariance: gauge
- model: deep inelastic scattering
- deep inelastic scattering: model
- photoproduction: total cross section
- total cross section: photoproduction
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