Elastic Production of Neutral Photo-Pions in Helium
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 question of independent and coherent production of pions in high energy processes. A model for coherent production is suggested and the restrictions due to momentum conservation, charge conservation, and isospin conservation are dealt with in detail. A formalism for the isospin analysis of identical pions is developed and applied to coherent states. Results and consequences a...
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Recently HERMES has observed an azimuthal asymmetry AUL in electro-production of neutral pions in semi-inclusive deep-inelastic scattering of unpolarized positrons off longitudinally polarized protons. This asymmetry (like those observed in the production of charged pions) is well reproduced theoretically by using the non-perturbative calculation of the proton transversity distribution h1 in 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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High energy reactions may produce a state around the collision point that is best described by a classical pion field. Such a field might be an isospin rotated vacuum of the chiral σ-model or, as discussed in this work, a solution of the equations of motion resultinng from the coupling of fields of this model to quarks produced in the collision. In such configurations all directions in isospin ...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1955
ISSN: 0033-068X
DOI: 10.1143/ptp.13.459