Photoproduction and electroproduction of pions (I) dispersion relation theory
نویسندگان
چکیده
منابع مشابه
Photoproduction of neutral pions
The pion and nucleon mass differences generate a very pronounced cusp in the photoproduction reaction of a single neutral pion on the proton. A nonrelativistic effective field theory to describe this reaction is constructed. The approach is rigorous in the sense that it is an effective field theory with a consistent power counting scheme. Expressions for the Sand P-wave multipole amplitudes at ...
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We investigate the exclusive electroproduction of π mesons from nucleons. To leading twist, leading order αs accuracy the corresponding production amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can be expressed in terms of quark double distribution functions of the nucleon. While the pseudovector contribution is connected to ordinary polarized quark distributions, th...
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Within the Excited Baryon Analysis Center we have performed a dynamical coupled-channels analysis of the available p(e,e′π)N data in the region of W ≤ 1.6 GeV and Q ≤ 1.45 (GeV/c). The channels included are γ∗N , πN , ηN , and ππN which has π∆, ρN , and σN components. With the hadronic parameters of the model determined in our previous investigations of πN → πN reaction, we have found that the ...
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We study the hard exclusive production of two pions in the virtual photon fragmentation region with various invariant masses including the resonance region. The amplitude is expressed in terms of two-pion light cone distribution amplitudes (2πDA’s). We derive dispersion relations for these amplitudes, which enables us to fix them completely in terms of ππ scattering phases and a few low-energy ...
متن کاملPomeron-Odderon interference effects in electroproduction of two pions
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a π π pair. We calculate these asymmetries originating from both longitudinal and transverse polarizations of the virtual photon, in the framework of QCD and in the Born approximation, in a kinematical domain accessible to HERA experiments. We predict a sizable cha...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1967
ISSN: 0550-3213
DOI: 10.1016/0550-3213(67)90196-4