Search for coherent charged pion production in neutrino-carbon interactions

We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed and an upper limit of

0.60 \times 10^{-2}

is set on the cross section ratio of coherent pion production to the total charged-current interaction at 90% confidence level. This is the first experimental limit for coherent charged pion production in the energy region of a few GeV.

Note:

5 pages, 4 figures

13.15.+g
13.60.Le
25.30.Pt
95.55.Vj
neutrino-nucleus reactions
neutrino oscillations
neutrino nucleus: inclusive reaction
carbon
neutrino/mu: secondary beam
charged current

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