Nuclear effects in Reactions νp -> μ^- p π^+ and νp -> μ^- Δ^{++}(1232) on Bound Protons

Details Nuclear effects in Reactions νp -> μ^- p π^+ and νp -> μ^- Δ^{++}(1232) on Bound Protons Nuclear effects in Reactions νp -> μ^- p π^+ and νp -> μ^- Δ^{++}(1232) on Bound Protons

2011-01-15

arxiv.org/abs/1101.2950v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 2 figures

Scientific paper

For the first time, the nuclear effects in the reaction \nu p -> \mu^- p \pi^+ on bound protons are investigated at E_\nu = 9 GeV and the effective atomicweight A = 21 of the composite nuclear target using the data obtained with SKAT bubble chamber. The observed nuclear effects are explained by the Fermi-motion of the target proton and secondary elastic scattering of neutrinoproduced hadrons on intranuclear neutrons. The probability of any intranuclear interaction of neutrinoproduced hadrons is extracted: P_int = 0.40+-0.13, while the probability of interactions occurring only via elastic scattering on intranuclear neutrons is estimated to be P_c = 0.14+-0.05. A clear evidence of the \Delta^{++}(1232) and an indication on the \Delta^{++}(1620) isobar states production are observed with the mean yields, respectively, 0.57+-0.09 and 0.40+-0.26 (the latter being corrected for the p \pi^+ decay fraction). The mean yield of \Delta^{++}(1232) is by 1.61+-0.25 times smaller than expected for the reaction on the hydrogen target, thus indicating on its rather strong nuclear absorption.

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