Evidence for Neutral-Current Diffractive π0 Production from Hydrogen in Neutrino Interactions on Hydrocarbon

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 wi...

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Detalles Bibliográficos
Autores: Wolcott J., Aliaga L., Altinok O., Bercellie A., Betancourt M., Bodek A., Bravar A., Budd H., Cai T., Carneiro M.F., Chvojka J., Da Motta H., Devan J., Dytman S.A., Díaz G.A., Eberly B., Endress E., Felix J., Fields L., Fine R., Galindo R., Gallagher H., 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., Marshall C.M., Martinez Caicedo D.A., McFarland K.S., McGivern C.L., McGowan A.M., Messerly B., Miller J., Mislivec A., Morfín J.G., Mousseau J., Naples D., Nelson J.K., Norrick A., Nuruzzaman, Osta J., Paolone V., Park J., Patrick C.E., Perdue G.N., Rakotondravohitra L., Ramirez M.A., Ray H., Ren L., Rimal D., Rodrigues P.A., Ruterbories D., Schellman H., Schmitz D.W., Solano Salinas C.J., Sánchez Falero S., Tagg N., Tice B.G., Valencia E., Walton T., Wospakrik M., Zhang D.
Tipo de recurso: artículo
Fecha de publicación:2016
País:Perú
Institución:Consejo Nacional de Ciencia Tecnología e Innovación
Repositorio:CONCYTEC-Institucional
Idioma:inglés
OAI Identifier:oai:repositorio.concytec.gob.pe:20.500.12390/609
Acceso en línea:https://hdl.handle.net/20.500.12390/609
https://doi.org/10.1103/PhysRevLett.117.111801
Access Level:acceso abierto
Palabra clave:Neutrons
Angular distribution
Elementary particles
Hydrocarbons
Intelligent systems
Monte Carlo methods
Electro-magnetic showers
Energy depositions
Energy distributions
Neutral currents
Neutrino interactions
Neutrino oscillations
Hydrogen production
Descripción
Sumario: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 π0 production with a broad energy distribution peaking at 7 GeV and a total cross section of 0.26 0.02ðstat.Þ 0.08ðsys:Þ × 10−39 cm2. 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 π0 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 νμ to νe oscillations.

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