''Pion production in antineutrino scattering by free nucleons and neutral currents''

A. MARIANO

Facultad Ciencias Exactas, UBA, Bs. As.

Congreso; AFA-SUF 2008; 2008

Asociación Física Argentina y Uruguaya

The one pion production in charged current $ u_{mu}N$ scatteringis analyzed within an extended version of a model used previouslyto include the $Delta(1232)$ contribution in elastic andradiative pion nucleon scattering, and in pion photoproduction.Because the resonant amplitude needs to be invariant under contacttransformations, we identify the correct forms of the $Delta$propagator and the  $W^- N Delta$ vertex that are consistent withthis requirement. The only free parameter of the model, the axialform factor at zero momentum transfer, is fixed from data on thedifferential cross section for $ u_{mu}p o mu^-ppi^+$scattering