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Article
The radial gauge propagator
We solve the Green’s function equation for a gauge field both in presence of the sharp gauge fixingx·A=0 and with the gauge-fixing term (x·A)2/2β. The ensuing propagators are symmetric in the field arguments.
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Article
Vertex functions and form factors for conformal spin-1/2 systems
Conformal on-shell wave functions are derived for spin-1/2 particle decaying virtually in spin 0 and spin 1/2. The relation to the off-shell vertex function is worked out and it is shown that shadow singularit...
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Article
Light-cone dominance of vertex functions for composite fields and asymptotic behaviour of elastic form factors
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Article
General threshold relation between deep inelastic electron scattering and deep inelastic electron-positron annihilation
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Article
Continuation from deep electroproduction to deep electron-positron annihilation
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Article
Commutators near the light-cone
A concrete dynamical model is studied to obtain information on scaling and related problems. The role ofO 4 expansion is pointed out, and the relation of scaling to small-distance behaviour of interactions is mad...
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Article
Commutators near the light cone, bjorken limits andO 4 expansion. Study of ladder models
A method based onO 4 expansion of thet=0 Compton amplitude is developed to discuss the light-cone behaviour of the matrix element of a current commutator. The behaviour of theO 4 partial waves at small distances ...
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Article
Regge families in the Wick-Cutkosky model
The bound solutions of the Wick-Cutkosky model are analytically continued to the whole complexl-plane by means of a method utilizing a Volterra integral equation equivalent to the Cutkosky differential equation. ...
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Article
Regge families in the wick-cutkosky model. Extension of previous results
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Article
Retardation effects and gauge transformations in the Bethe-Salpeter equations
The ladder Bethe-Salpeter equation with Feynman propagators gives rise to spurious corrections of orderv/c to the nonrelativistic limit. The exact cancellation of these retardation effects by the introduction of ...
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Article
Properties of relativistic bound states
In this paper we examine some properties of two-boson bound states for very high binding energy in the Bethe-Salpeter framework. We point out the relativistic nature of the high binding energy limit and we giv...
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Article
Analysis ofS-matrix singularities by means of operator technique
The problem of determining the singularities of theS-matrix for a given angular momentum in thek-plane, is reduced to an eigenvalue problem for compact operators. In particular we examine the dependence of the po...
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Article
Subtraction constants inπ-π→ dispersion relationdispersion relation
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Article
Evidence for pion-pion interactions froms-wave pion-nucleon scattering
By fitting the s-wave partial amplitudes for π- -scattering, in an unphysical region, we have greatly extended the energy range over which we can examine the contribution from t...