Pion-nucleon vertex function with one nucleon off shell
نویسندگان
چکیده
منابع مشابه
Off-shell pion structure function and flavor asymmetry in the nucleon sea
We study off-shell effects of the pion cloud on the sea quark distribution in the nucleon. The structure function of the off-mass-shell pion is obtained within the Nambu and Jona-Lasinio model, where the shape of the distribution function depends on the pion momentum. By using the momentum dependent pion structure function, the SU(2) flavor asymmetry in the nucleon see is reexamined within the ...
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We report on recent results obtained by the above collaboration on the collision processes involving three nucleons, where we pay particular attention on the dynamical role of the pion. After discussing the case at intermediate energies, where real pions can be produced and detected, we have considered the case at lower energies, where the pions being exchanged are virtual. The study has reveal...
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In recent years there has been increasing attention to hard exclusive processes involving emission of soft pions in the final state. In the near future new experimental data will emerge and their interpretation requires information about the nucleon wave function. Such processes are attractive as they provide us new insights in the hadron (nucleon) structure. At this point the nucleon distribut...
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We study neutrino induced one-pion production off the nucleon in and around the Delta resonance region. Apart from the Delta-pole mechanism we include background terms required by chiral symmetry. These background terms give sizeable contributions in all channels. To better reproduce the ANL q-differential cross section data, we make a new fit of the C 5 (q ) axial nucleon to Delta form factor....
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The neutrino pion production off the nucleon is traditionally described in the literature by means of the weak excitation of the ∆(1232) resonance and its subsequent decay into Nπ . Here, we present results from a model that includes also some background terms required by chiral symmetry. We show that the contribution of these terms is sizeable and leads to significant effects in total and part...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 1979
ISSN: 0556-2813
DOI: 10.1103/physrevc.19.958