Vector and axial nucleon form factors: A duality constrained parameterization

被引:138
作者
Bodek, A. [1 ]
Avvakumov, S. [1 ]
Bradford, R. [1 ]
Budd, H. [1 ]
机构
[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
来源
EUROPEAN PHYSICAL JOURNAL C | 2008年 / 53卷 / 03期
关键词
D O I
10.1140/epjc/s10052-007-0491-4
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
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 nu(mu)d and pion electroproduction experiments of M-A=1.014 +/- 0.014 GeV/c(2). 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.
引用
收藏
页码:349 / 354
页数:6
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