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Evidence for neutral-current diffractive neutral pion production from hydrogen in neutrino interactions on hydrocarbon

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arxiv 1604.01728 v5 pith:L7U6T3GX submitted 2016-04-06 hep-ex physics.ins-det

Evidence for neutral-current diffractive neutral pion production from hydrogen in neutrino interactions on hydrocarbon

MINERvA Collaboration: J. Wolcott , L. Aliaga , O. Altinok , A. Bercellie , M. Betancourt , A. Bodek , A. Bravar , H. Budd
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T. Cai M.F. Carneiro J. Chvojka H. da Motta J. Devan S.A. Dytman G.A. D\'iaz B. Eberly E. Endress J. Felix L. Fields R. Fine R.Galindo H. Gallagher T. Golan R. Gran D.A. Harris A. Higuera K. Hurtado M. Kiveni J. Kleykamp M. Kordosky T. Le E. Maher S. Manly W.A. Mann C.M. Marshall D.A. Martinez Caicedo K.S. McFarland C.L. McGivern A.M. McGowan B. Messerly J. Miller A. Mislivec J.G. Morf\'in J. Mousseau D. Naples J.K. Nelson A. Norrick Nuruzzaman J. Osta V. Paolone J. Park C.E. Patrick G.N. Perdue L. Rakotondravohitra M.A. Ramirez H. Ray L. Ren D. Rimal P.A. Rodrigues D. Ruterbories H. Schellman D.W. Schmitz C.J. Solano Salinas S. S\'anchez Falero N. Tagg B.G. Tice E. Valencia T. Walton M.Wospakrik D. Zhang
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classification hep-ex physics.ins-det
keywords neutrinoenergyneutral-currentdistributionexcesshydrocarbonneutralpion
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The MINERvA experiment observes an excess of events containing electromagnetic showers relative to the expectation from Monte Carlo simulations in neutral-current neutrino interactions with mean beam energy of 4.5 GeV on a hydrocarbon target. The excess is characterized and found to be consistent with neutral-current neutral pion production with a broad energy distribution peaking at 7 GeV and a total cross section of 0.26 +- 0.02 (stat) +- 0.08 (sys) x 10^{-39} cm^{2}. The angular distribution, electromagnetic shower energy, and spatial distribution of the energy depositions of the excess are consistent with expectations from neutrino neutral-current diffractive neutral pion production from hydrogen in the hydrocarbon target. These data comprise the first direct experimental observation and constraint for a reaction that poses an important background process in neutrino oscillation experiments searching for muon neutrino to electron neutrino oscillations.

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