Electroproduction of n mesons in the S11(1535) resonance region at high momentum transfer
Date
2009-03-31T05:39:09Z
Authors
Dalton, Mark Macrae
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Abstract
The differential cross-section for the exclusive process p(e, e0p) has been
measured at Q2 5.7 and 7.0 (GeV/c)2, which represents the highest momentum
transfer measurement of this to date, significantly higher than the
previous highest at Q2 3.6 (GeV/c)2. Data was taken for centre-of-mass
energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance,
which dominates the p channel. The total cross section is obtained, from
which is extracted the helicity-conserving transition amplitude A1/2, for the
production of the S11(1535) resonance. This quantity appears to begin scaling
as Q−3, a predicted signal of the dominance of perturbative QCD, within
the Q2 range of this measurement. No currently available theoretical predictions
can account for the behaviour of this quantity over the full measured
range of Q2.