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  • First evidence of coherent $K^{+}$ meson production in neutrino-nucleus scattering
    Wang, Z; Marshall, C. M; Aliaga, L; Altinok, O; Bellantoni, L; Bercellie, A; Betancourt, M; Bodek, A; Bravar, A; Budd, H; Cai, T; Carneiro, M. F; da Motta, H; Dytman, S. A; Dìaz, G. A; Eberly, B; Endress, E; Felix, J; Fields, L; Fine, R; Galindo, R; Gallagher, H; Ghosh, A; Golan, T; Gran, R; Harris, D. A; Higuera, A; Hurtado, K; Kiveni, M; Kleykamp, J; Kordosky, M; Le, T; Maher, E; Manly, S; Mann, W. A; Caicedo, D. A. Martinez; McFarland, K. S; McGivern, C. L; McGowan, A. M; Messerly, B; Miller, J; Mislivec, A; Morfìn, J. G; Mousseau, J; Naples, D; Nelson, J. K; Norrick, A; Nuruzzaman; Paolone, V; Park, J; Patrick, C. E; Perdue, G. N; Rakotondravohitra, L; Ramirez, M. A; Ransome, R. D; Ray, H; Ren, L; Rimal, D; Rodrigues, P. A; Ruterbories, D; Schellman, H; Schmitz, D. W; Simon, C; Salinas, C. J. Solano; Tice, B. G; Valencia, E; Walton, T; Wolcott, J; Wospakrik, M; Zavala, G; Zhang, D

    06/2016
    Journal Article

    Phys. Rev. Lett. 117, 061802 (2016) Neutrino-induced charged-current coherent kaon production, $\nu_{\mu}A\rightarrow\mu^{-}K^{+}A$, is a rare, inelastic electroweak process that brings a $K^+$ on shell and leaves the target nucleus intact in its ground state. This process is significantly lower in rate than neutrino-induced charged-current coherent pion production, because of Cabibbo suppression and a kinematic suppression due to the larger kaon mass. We search for such events in the scintillator tracker of MINERvA by observing the final state $K^+$, $\mu^-$ and no other detector activity, and by using the kinematics of the final state particles to reconstruct the small momentum transfer to the nucleus, which is a model-independent characteristic of coherent scattering. We find the first experimental evidence for the process at $3\sigma$ significance.

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