منابع مشابه
Electroproduction of nucleon resonances
The unitary isobar model MAID has been extended and used for a partial wave analysis of pion photoand electroproduction in the resonance region W < 2 GeV. Older data from the world data base and more recent experimental results from Mainz, Bates, Bonn and JLab for Q up to 4.0 (GeV/c) have been analyzed and the Q dependence of the helicity amplitudes have been extracted for a series of four star...
متن کاملWeak and Electroproduction of Nucleon Resonances in the Harmonic Oscillator Quark Model
Using the model that the baryons are composed of quarks with harmonic interactions, we compute cross-sections for high energy neutrinos and electrons to excite the nucleon to the resonance states with masses below 1.9 GeV. The frame dependence of the nonrelativistic quark model results is emphasized and discrepancies between some previous model calculations of electroproduction form factors and...
متن کاملExcitation of Nucleon Resonances
I discuss developments in the area of nucleon resonance excitation, aimed at putting our understanding of nucleon structure in the regime of strong QCD on a qualitatively new level. They involve the collection of high quality data in various channels, a more rigorous approach in the search for “missing” resonances, an effort to compute some critical quantities in nucleon resonance excitations f...
متن کاملProbing nucleon strangeness structure with φ electroproduction
We study the possibility to constrain the hidden strangeness content of the nucleon by means of the polarization observables in φ meson electroproduction. We consider the OZI evading direct knockout mechanism that arises from the non-vanishing ss̄ sea quark admixture of the nucleon as well as the background of the dominant diffractive and the oneboson-exchange processes. Large sensitivity on the...
متن کاملProbing nucleon strangeness in φ electroproduction
The subject of the strangeness content of the nucleon and nuclei has been one of the important issues in hadron and nuclear physics [1]. Production of φ meson from nucleon target has been suggested as a sensitive probe to study the strangeness content of the nucleon. Because of the ideal mixing with ω, φ meson is nearly a pure ss̄ state and its direct coupling to the nucleon must be suppressed b...
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2004
ISSN: 1434-6001,1434-601X
DOI: 10.1140/epjad/s2004-03-009-9