Gauge invariance in two-particle scattering

Abstract

It is shown how gauge invariance is obtained for the coupling of a photon to a two-body state described by the solution of the Bethe-Salpeter equation. This is illustrated both for a complex scalar field theory and for interaction kernels derived from chiral effective Lagrangians.

16 pages, 2 figures, references added and commented on

References in corpus (1)

• eta, eta-prime -> pi^+ pi^- gamma with coupled channels

Cited by in corpus (27)

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• Two-photon decays of hadronic molecules
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• A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton
• Gauge-invariant approach to meson photoproduction including the final-state interaction
• On the cross section ratio sigma_n/sigma_p in eta photoproduction
• Pion photoproduction in a dynamical coupled-channels model
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Pion photoproduction off the proton in a gauge-invariant chiral unitary framework
• Internal structure of resonant Lambda(1405) state in chiral dynamics
• Electromagnetic mean squared radii of Lambda(1405) in chiral dynamics
• The phase and pole structure of the N*(1535) in piN-->piN and gammaN-->piN
• Radiative decay of the Lambda(1520)
• The radiative decay of the $\Lambda (1405)$ and its two-pole structure
• Radiative decay of the Delta(1700)
• Helicity Amplitudes of the Lambda(1670) and two Lambda(1405) as dynamically generated resonances
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• $\Lambda (1520)$ and $\Sigma (1385)$ in the nuclear medium
• Radiative decays of dynamically generated charmed baryons
• Photoproduction of the $f_2^{\prime }(1525)$ and $K_2^{\ast }(1430)$
• Photoproduction of the $f_2(1270)$ resonance
• Radiative decay into $\gamma P$ of the low lying axial-vector mesons
• Comment on "Once more about the KK molecule approach to the light scalars"
• Gauge invariance in the presence of a cutoff
• Electric Mean Squared Radii of Lambda(1405) in Chiral Dynamics