Exclusive meson electroproduction
Date
2009-04-23T09:44:49Z
Authors
Njencheu, Georgie Mbianda
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Abstract
Jefferson Lab experiment E01-002 obtained data that can be used to determine
the cross section of the process p(e; e0¼+)n at the invariant mass range
of 1:3 GeV · W · 2:0 GeV (second and third resonance regions) and at
a forward angular range of 0:6 · cos µcm · 1. These data have recently
been used for resonance studies that have employed the ¼0 and ´ channels
to study the lower mass states like ¢(1232) and the S11(1535). However,
many of the higher mass isospin 1
2 resonances couple more strongly to the
¼+n channel. With data from E01-002, this dissertation presents the cross
section obtained on this channel at an average Q2 value of 5.5 GeV2. This
is the highest Q2 measurement of this exclusive process to date. The results
are sensitive to high-mass resonances and diverge significantly from a recent theoretical model extrapolation of lower Q2 data.