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A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV | A1 Collaboration: A. Liesenfeld
; et al
; | Date: |
11 Nov 1999 | Journal: | Phys.Lett. B468 (1999) 20 | Subject: | nucl-ex | Abstract: | 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. | Source: | arXiv, nucl-ex/9911003 | Services: | Forum | Review | PDF | Favorites |
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