Gauge-invariant approach to meson photoproduction including the final-state interaction

Abstract

A fully gauge-invariant (pseudoscalar) meson photoproduction amplitude off a nucleon including the final-state interaction is derived. The approach based on a comprehensive field-theoretical formalism developed earlier by one of the authors replaces certain dynamical features of the full interaction current by phenomenological auxiliary contact currents. A procedure is outlined that allows for a systematic improvement of this approximation. The feasibility of the approach is illustrated by applying it to both the neutral and charged pion photoproductions.

arXiv comment14 pages, 8 figures, RevTeX4; revised version as scheduled to appear in Physical Review C

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• Nucleon resonances in $\gamma p\to K^{\ast +}\Lambda$
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• Dressing the electromagnetic nucleon current
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• ${\Lambda }_c^{+}(2940)$ photoproduction off the neutron
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• Studies on the polarization transfer coefficients C_x and C_z in the gamma p -> K^+ Lambda(1520,3/2^-) reaction process
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• Theory of two-pion photo- and electroproduction off the nucleon
• Gauge-invariant formulation of $NN\to NN\gamma$
• Photoproduction of $f_0(980)$ and $f_0(1500)$ resonances off a proton target
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• Measurement and analysis of the pp -> pp gamma reaction at 310 MeV
• Gauge invariance of meson photo- and electroproduction currents revisited
• Gauge-invariant theory of two-pion photo- and electro-production off the nucleon
• Electromagnetic currents for dressed hadrons
• Method for measuring the charge radii of charged hyperons from the time-like region
• Combined analysis of the $\gamma n\to K^0{\Sigma }^0$ and $\gamma n\to K^{+}{\Sigma }^{-}$ reactions
• Electromagnetic currents of the pion-nucleon system
• Complex phase structure of the meson-baryon $T$-matrix
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
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