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Experimental study of the atmospheric neutrino backgrounds for p -> e(+)pi(0) searches in water Cherenkov detectors

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Experimental study of the atmospheric neutrino backgrounds for p -> e(+)pi(0) searches in water Cherenkov detectors

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K2K Collaboration; Mine, S.; Cervera Villanueva, Anselmo; Burguet Castell, Jordi; Català Pérez, Joan; Gómez Cadenas, Juan José Perfil; Novella Garijo, Pau; Vidal Sitjes, Gabriel; Sorel, Michel; Tornero López, Ana María

This document is a artículoDate2008

Este documento está disponible también en : http://hdl.handle.net/10550/49592

The atmospheric neutrino background for proton decay via p -> e(+)pi(0) in ring imaging water Cherenkov detectors is studied with an artificial accelerator neutrino beam for the first time. In total, 3.14x10(5) neutrino events corresponding to about 10 megaton-years of atmospheric neutrino interactions were collected by a 1000 ton water Cherenkov detector (KT). The KT charged-current single pi(0) production data are well reproduced by simulation programs of neutrino and secondary hadronic interactions used in the Super-Kamiokande (SK) proton decay search. The obtained p -> e(+)pi(0) background rate by the KT data for SK from the atmospheric neutrinos whose energies are below 3 GeV is 1.63(-0.33)(+0.42)(stat)(-0.51)(+0.45)(syst)(megaton-year)(-1). This result is also relevant to possible future, megaton-scale water Cherenkov detectors.

K2K Collaboration Mine, S. Cervera Villanueva, Anselmo Burguet Castell, Jordi Català Pérez, Joan Gómez Cadenas, Juan José Novella Garijo, Pau Vidal Sitjes, Gabriel Sorel, Michel Tornero López, Ana María 2008 Experimental study of the atmospheric neutrino backgrounds for p -> e(+)pi(0) searches in water Cherenkov detectors Physical Review D 77 3 032003

http://dx.doi.org/10.1103/PhysRevD.77.032003