Search for a Diffuse Flux of High-Energy Extraterrestrial Neutrinos with the NT200 Neutrino Telescope

Abstract

We present the results of a search for high energy extraterrestrial neutrinos with the Baikal underwater Cherenkov detector NT200, based on data taken in 1998 - 2002. Upper limits on the diffuse fluxes of ${\nu }_e+{\nu }_{\mu }+{\nu }_{\tau }$, predicted by several models of AGN-like neutrino sources, are derived. For an $E^{-2}$ behavior of the neutrino spectrum, our limit is $E^2{\Phi }_{\nu }(E)<8.110^{-7}c{m}^{-2}{s}^{-1}s{r}^{-1}GeV$ over an neutrino energy range $210^4-510^{7}GeV$. The upper limit on the resonant ${\bar{\nu }}_e$ diffuse flux is ${\Phi }_{{\bar{\nu }}_e}<3.310^{-20}c{m}^{-2}{s}^{-1}s{r}^{-1}Ge{V}^{-1}$.

19 pages, 23 figures, submitted to Astroparticle Physics

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