Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-08-14
Eur.Phys.J.C53:349-354,2008
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 3 figures, to be published in EPJC
Scientific paper
10.1140/epjc/s10052-007-0491-4
We present new parameterizations of vector and axial nucleon form factors. We maintain an excellent descriptions of the form factors at low momentum transfers, where the spatial structure of the nucleon is important, and use the Nachtman scaling variable xi to relate elastic and inelastic form factors and impose quark-hadron duality constraints at high momentum transfers where the quark structure dominates. We use the new vector form factors to re-extract updated values of the axial form factor from neutrino experiments on deuterium. We obtain an updated world average value from neutrino-d and pion electroproduction experiments of M_A = 1.014 +- 0.014 GeV/c2. Our parameterizations are useful in modeling neutrino interactions at low energies (e.g. for neutrino oscillations experiments). The predictions for high momentum transfers can be tested in the next generation electron and neutrino scattering experiments.
Avvakumov S.
Bodek Arie
Bradford Robert
Budd H.
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