Virtual Compton scattering off the nucleon in chiral perturbation theory
نویسندگان
چکیده
منابع مشابه
Real and Virtual Compton Scattering off the Nucleon
A review is given of the very recent developments in the fields of real and virtual Compton scattering off the nucleon. Both real and virtual Compton scattering reactions are discussed at low outgoing photon energy where one accesses polarizabilities of the nucleon. The real Compton scattering at large momentum transfer is discussed which is asymptotically a tool to obtain information on the va...
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We investigate the low-energy behavior of the four-point Green’s function Γ describing virtual Compton scattering off the nucleon. Using Lorentz invariance, gauge invariance, and crossing symmetry, we derive the leading terms of an expansion of the operator in the four-momenta q and q′ of the initial and final photon, respectively. The model-independent result is expressed in terms of the elect...
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Two different topics relevant for DAΦNE and CEBAF, respectively, are covered. First we analyze the rare radiative eta decay mode η → ππγγ within the framework of chiral perturbation theory at O(p 4). We then discuss virtual Compton scattering off the nucleon at low energies. Predictions for the two spin-independent generalized polarizabilities are shown.
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We compute the cross section for leptoproduction of the real photon off the nucleon, which is sensitive to the deeply virtual Compton scattering amplitude with power accuracy. Our considerations go beyond the leading twist and involve the complete analysis in the twist-three approximation. We discuss consequences of the target and lepton beam polarizations for accessing the generalized parton d...
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By means of the Inverse Amplitude Method we unitarize the elastic pion-nucleon scattering amplitudes obtained from Heavy Baryon Chiral Perturbation Theory to O(q3). Within this approach we can enlarge their applicability range and generate the ∆(1232) resonance. We can find a reasonable description of the pion nucleon phase shifts with O(q2) parameters in agreement with the resonance saturation...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.55.2630