6533b872fe1ef96bd12d4258

RESEARCH PRODUCT

NEUTRINO-INDUCED WEAK PION PRODUCTION OFF THE NUCLEON

E. HernándezM. ValverdeJuan Luis Nieves

subject

PhysicsNuclear and High Energy PhysicsParticle physicsChiral symmetryNuclear TheoryQuark modelFísicaFOS: Physical sciencesGeneral Physics and AstronomyAstronomy and AstrophysicsAccepted and experimental valueNeutrino scatteringHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)PionLattice (order)NeutrinoNucleon

description

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

https://doi.org/10.1142/s0217732308029289