A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV

Details A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV

1999-11-11

arxiv.org/abs/nucl-ex/9911003v1

Phys.Lett.B468:20,1999

Physics

Nuclear Physics

Nuclear Experiment

14 pages, 5 figures, uses elsart.cls

Scientific paper

10.1016/S0370-2693(99)01204-6

The reaction p(e,e'pi+)n was measured at the Mainz Microtron MAMI at an invariant mass of W=1125 MeV and four-momentum transfers of Q^2=0.117, 0.195 and 0.273 (GeV/c)^2. For each value of Q^2, a Rosenbluth separation of the transverse and longitudinal cross sections was performed. An effective Lagrangian model was used to extract the `axial mass' from experimental data. We find a value of M_A=(1.077+-0.039) GeV which is (0.051+-0.044) GeV larger than the axial mass known from neutrino scattering experiments. This is consistent with recent calculations in chiral perturbation theory.

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