Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-14
AIP Conf.Proc.1222:227-232,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at NUFACT09. 6 latex pages, 7 figures, 1 table
Scientific paper
10.1063/1.3399302
We discuss different parameterizations of the $C_5^A(q^2)$ $N\Delta$ axial form factor, fitted to the old Argonne bubble chamber data for pion production by neutrinos, and we use coherent pion production to test their low $q^2$ behavior. We find moderate effects that will be difficult to observe with the accuracy of present experiments. We also discuss the use of the Rein-Sehgal model for low energy coherent pion production. By comparison to a microscopic calculation, we show the weaknesses of some of the approximations in that model that lead to very large cross sections as well as to the wrong shapes for differential ones. Finally we show that models based on the partial conservation of the axial current hypothesis are not fully reliable for differential cross sections that depend on the angle formed by the pion and the incident neutrino.
Hernandez Eduardo
Nieves Juan
Valverde M.
Vicente-Vacas M. J.
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