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arxiv: 0804.3509 · v5 · submitted 2008-04-22 · ✦ hep-ex

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Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer

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classification ✦ hep-ex
keywords resonancemeasuredmomentumprocesstransferamplitudeappearsbeen
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The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. Within the limited Q2 now measured, this quantity appears to begin scaling as 1/Q3 - a predicted, but not definitive, signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

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