TY  - JOUR
AU  - ANTARES Collaboration (Albert, A. et al
AU  - Barrios-Marti, J.
AU  - Coleiro, A.
AU  - Hernandez-Rey, J. J.
AU  - Illuminati, G.
AU  - Lotze, M.
AU  - Tönnis, C.
AU  - Zornoza, J. D.
AU  - Zuñiga, J.
PY  - 2018
DA  - 2018//
TI  - All-flavor Search for a Diffuse Flux of Cosmic Neutrinos with Nine Years of ANTARES Data
T2  - Astrophys. J. Lett.
JO  - Astrophysical Journal Letters
SP  - L7 - 5pp
VL  - 853
IS  - 1
PB  - Iop Publishing Ltd
KW  - astroparticle physics
KW  - neutrinos
AB  - The ANTARES detector is at present the most sensitive neutrino telescope in the northern hemisphere. The highly significant cosmic neutrino excess observed by the Antarctic IceCube detector can be studied with ANTARES, exploiting its complementing field of view, exposure, and lower energy threshold. Searches for an all-flavor diffuse neutrino signal, covering nine years of ANTARES data taking, are presented in this Letter. Upward-going events are used to reduce the atmospheric muon background. This work includes for the first time in ANTARES both track-like (mainly nu mu) and shower-like (mainly nu(e)) events in this kind of analysis. Track-like events allow for an increase of the effective volume of the detector thanks to the long path traveled by muons in rock and/ or sea water. Shower-like events are well reconstructed only when the neutrino interaction vertex is close to, or inside, the instrumented volume. A mild excess of high-energy events over the expected background is observed in nine years of ANTARES data in both samples. The best fit for a single power-law cosmic neutrino spectrum, in terms of perflavor flux at 100 TeV, is Phi(1f)(0) (100 TeV) = (1.7 +/- 1.0) x 10(-18) GeV-1 cm(-2) s(-1) sr(-1) with spectral index Gamma = 2.4(-0.4)(+0.5) .The null cosmic flux assumption is rejected with a significance of 1.6 sigma .
SN  - 2041-8205
UR  - http://arxiv.org/abs/1711.07212
UR  - https://doi.org/10.3847/2041-8213/aaa4f6
DO  - 10.3847/2041-8213/aaa4f6
LA  - English
N1  - WOS:000423182700004
ID  - ANTARESCollaborationAlbert_etal2018
ER  -