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Coupling of baryon resonances to the Nω channel

✍ Scribed by M. Post; U. Mosel

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
146 KB
Volume
688
Category
Article
ISSN
0375-9474

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✦ Synopsis

We estimate the resonance coupling strength f RNω and f RNρ from a Vector Meson Dominance (VMD) analysis. The isoscalar and isovector part of the photon coupling are obtained separately from helicity amplitudes. The reliability of this approach is tested by comparing VMD predictions for f RNρ with values obtained from fitting the hadronic decay widths into Nρ. A reasonable agreement is found, but VMD tends to underestimate the coupling constants. In order to confirm consistency with experimental data, we calculate the cross-sections for photon-and pion-induced reactions within a Breit-Wigner model. Finally, we study how the properties of ω mesons in nuclear matter are affected from the excitation of resonance-hole loops. For an ω at rest, we find a broadening of about 40 MeV, while at higher momenta the effect of resonance excitations is reduced.

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