Search for a diffuse flux of high-energy neutrinos with the Baikal neutrino telescope NT200

Abstract

We present the results of a new analysis of data taken in 1998-2002 for a search for high-energy extraterrestrial neutrinos. The analysis is based on a full reconstruction of high-energy cascade parameters: vertex coordinates, energy and arrival direction. Upper limits on the diffuse fluxes of all neutrino flavors, predicted by several models of AGN-like neutrino sources are derived. For an ${\mathbf{E}}^{-2}$ behavior of the neutrino spectrum, our limit is ${\mathbf{E}}^2{\mathbf{F}}_{\nu }(\mathbf{E})<2.9\times 10^{-7}$ cm${}^{-2}$ s${}^{-1}$ sr${}^{-1}$ GeV over a neutrino energy range $2\times 10^4÷2\times 10^7$ GeV. This limit is by a factor of 2.8 more stringent than a limit obtained with a previous analysis.

arXiv comment4 pages, 3 figures, Proceedings of the 31st ICRC, Lodz, Poland, July 2009

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