Neutrino induced threshold production of two pions and N^*(1440) electroweak form factors

Details Neutrino induced threshold production of two pions and N^*(1440) electroweak form factors Neutrino induced threshold production of two pions and N^*(1440) electroweak form factors

2007-10-18

arxiv.org/abs/0710.3562v2

Phys.Rev.D77:053009,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

This version corrects a mistake on the helicity amplitudes sign. Additional comments on resonance-background relative sign are

Scientific paper

10.1103/PhysRevD.77.053009

We study the threshold production of two pions induced by neutrinos in nucleon targets. The contribution of nucleon, pion and contact terms are calculated using a chiral Lagrangian. The contribution of the Roper resonance, neglected in earlier studies, has also been taken into account. The numerical results for the cross sections are presented and compared with the available experimental data. It has been found that in the two pion channels with $\pi^+\pi^-$ and $\pi^0\pi^0$ in the final state, the contribution of the $N^*(1440)$ is quite important and could be used to determine the $N^*(1440)$ electroweak transition form factors if experimental data with better statistics become available in the future.

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