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SUMMARY:Excitation on the nucleon resonances in pion photo- and electropro
 duction
DTSTART;VALUE=DATE-TIME:20000921T093000Z
DTEND;VALUE=DATE-TIME:20000921T103000Z
DTSTAMP;VALUE=DATE-TIME:20261012T064043Z
UID:indico-event-1188@indico.ific.uv.es
DESCRIPTION:Using recently developed Unitary Isobar and Dynamical models n
 ucleon resonances in the first\, second and third resonance regions are an
 alysed. Within Dynamical Model we find that the bare $\\Delta(1232)$ reson
 ance is almost spherical and the electric E2 and Coulomb C2 quadrupole exc
 itations are nearly saturated by pion cloud contribution. From the recent 
 $p(e\,e'p)\\pi^0$ at $Q^2=$ 2.8 and 4.0 (GeV/c)$^2$ we demonstrate that co
 ntribution from the electric E2 excitations\, starting from a small and ne
 gative value at real photon point\, shows a clear tendency to cross zero\,
  and change sign with increasing $Q^2$. This is a possible indication of a
  slow approach toward the pQCD region.\n\nhttps://indico.ific.uv.es/event/
 1188/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1188/
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