Neutrino induced weak pion production off the nucleon

Details Neutrino induced weak pion production off the nucleon Neutrino induced weak pion production off the nucleon

2008-02-12

arxiv.org/abs/0802.1627v1

Mod.Phys.Lett.A23:2317-2320,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 latex pages, 2 figures. Contribution at Chiral Symmetry in Hadron and Nuclear Physics (CHIRAL07), Osaka, November 13-16, 200

Scientific paper

10.1142/S0217732308029289

We study neutrino induced one-pion production off the nucleon in and around the Delta resonance region. Apart from the Delta-pole mechanism we include background terms required by chiral symmetry. These background terms give sizeable contributions in all channels. To better reproduce the ANL $q^2$-differential cross section data, we make a new fit of the $C_5^A(q^2)$ axial nucleon to Delta form factor. The new result $C_5^A(0)=0.867\pm 0.075$ is some 30% smaller than the commonly accepted value. This correction is compatible with most quark model estimates and a recent lattice calculation

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