An algorithm for the reconstruction of high-energy neutrino-induced particle showers and its application to the ANTARES neutrino telescope

Albert, A.; AndrÃ©, M.; Anghinolfi, M.; Anton, G.; Ardid, M.; Aubert, J. -.J.; Avgitas, T.; Baret, B.; Barrios-MartÃ­, J.; Basa, S.; Bertin, V.; Biagi, S.; Bormuth, R.; Bourret, S.; Bouwhuis, M. C.; Bruijn, R.; Brunner, J.; Busto, J.; Capone, A.; Caramete, L.; Carr, J.; Celli, S.; Chiarusi, T.; Circella, M.; Coelho, J. A. B.; Coleiro, A.; Coniglione, R.; Costantini, H.; Coyle, P.; Creusot, A.; Deschamps, A.; De Bonis, G.; Distefano, C.; Di Palma, I.; Domi, A.; Donzaud, C.; Dornic, D.; Drouhin, D.; Eberl, T.; El Bojaddaini, I.; ElsÃ¤sser, D.; EnzenhÃ¶fer, A.; Felis, I.; Folger, F.; Fusco, L. A.; GalatÃ , S.; Gay, P.; Giordano, V.; Glotin, H.; GrÃ©goire, T.; Gracia Ruiz, R.; Graf, K.; Hallmann, S.; van Haren, H.; Heijboer, A. J.; Hello, Y.; HernÃ¡ndez-Rey, J. J.; HÃ¶ÃŸl, J.; HofestÃ¤dt, J.; Hugon, C.; Illuminati, G.; James, C. W.; de Jong, M.; Jongen, M.; Kadler, M.; Kalekin, O.; Katz, U.; KieÃŸling, D.; Kouchner, A.; Kreter, M.; Kreykenbohm, I.; Kulikovskiy, V.; Lachaud, C.; Lahmann, R.; LefÃvre, D.; Leonora, E.; Lotze, M.; Loucatos, S.; Marcelin, M.; Margiotta, A.; Marinelli, A.; MartÃ­nez-Mora, J. A.; Mele, R.; Melis, K.; Michael, T.; Migliozzi, P.; Moussa, A.; Nezri, E.; Organokov, M.; PÄƒvÄƒlaÅŸ, G. E.; Pellegrino, C.; Perrina, C.; Piattelli, P.; Popa, V.; Pradier, T.; Quinn, L.; Racca, C.; Riccobene, G.; SÃ¡nchez-Losa, A.; SaldaÃ±a, M.; Salvadori, I.; Samtleben, D. F. E.; Sanguineti, M.; Sapienza, P.; SchÃ¼ssler, F.; Sieger, C.; Spurio, M.; Stolarczyk, T.h.; Taiuti, M.; Tayalati, Y.; Trovato, A.; Turpin, D.; TÃ¶nnis, C.; Vallage, B.; Van Elewyck, V.; Versari, F.; Vivolo, D.; Vizzoca, A.; Wilms, J.; Zornoza, J. D.; ZÃºÃ±iga, J.

doi:10.1140/epjc/s10052-017-4979-2

A novel algorithm to reconstruct neutrino-induced particle showers within the ANTARES neutrino telescope is presented. The method achieves a median angular resolution of 6âfor shower energies below 100Â TeV. Applying this algorithm to 6 years of data taken with the ANTARES detector, 8 events with reconstructed shower energies above 10Â TeV are observed. This is consistent with the expectation of about 5 events from atmospheric backgrounds, but also compatible with diffuse astrophysical flux measurements by the IceCube collaboration, from which 2â4 additional events are expected. A 90 % C.L. upper limit on the diffuse astrophysical neutrino flux with a value per neutrino flavour of E2Â·Î¦90%=4.9Â·10-8GeVÂ·cm-2Â·s-1Â·sr-1 is set, applicable to the energy range from 23Â TeV to 7.8Â PeV, assuming an unbroken E- 2spectrum and neutrino flavour equipartition at Earth.