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

A. Albert 1 M. André M. Anghinolfi G. Anton M. Ardid J.-J. Aubert 2 T. Avgitas 3 B. Baret 3 J. Barrios-Martí S. Basa 4 V. Bertin 2 S. Biagi R. Bormuth S. Bourret 3 M.C. Bouwhuis R. Bruijn J. Brunner 2 J. Busto 2 A. Capone L. Caramete J. Carr 2 S. Celli T. Chiarusi M. Circella J.A.B. Coelho 3 A. Coleiro 3 R. Coniglione H. Costantini 2 P. Coyle 2 A. Creusot 3 A. Deschamps 5 G. de Bonis C. Distefano I. Di Palma A. Domi C. Donzaud 3, 6 D. Dornic 2 D. Drouhin 1 T. Eberl I. El Bojaddaini D. Elsässer A. Enzenhöfer 2 I. Felis F. Folger L.A. Fusco S. Galatà 3 P. Gay 3, 7 V. Giordano H. Glotin 8, 9 T. Grégoire 3 R. Gracia Ruiz 3 K. Graf S. Hallmann H. van Haren A.J. Heijboer Y. Hello 5 J.J. Hernández-Rey J. Hößl J. Hofestädt C. Hugon G. Illuminati C.W. James M. de Jong M. Jongen M. Kadler O. Kalekin U. Katz D. Kießling A. Kouchner 3 M. Kreter I. Kreykenbohm V. Kulikovskiy 2 C. Lachaud 3 R. Lahmann D. Lefèvre 10 E. Leonora M. Lotze S. Loucatos 3, 11 M. Marcelin 4 A. Margiotta A. Marinelli J.A. Martínez-Mora R. Mele K. Melis T. Michael P. Migliozzi A. Moussa E. Nezri 4 M. Organokov 12 G.E. Păvălaş C. Pellegrino C. Perrina P. Piattelli V. Popa T. Pradier 12 L. Quinn 2 C. Racca 1 G. Riccobene A. Sánchez-Losa M. Saldaña I. Salvadori 2 D.F.E. Samtleben M. Sanguineti P. Sapienza F. Schüssler 11 C. Sieger M. Spurio Th. Stolarczyk 11 M. Taiuti Y. Tayalati A. Trovato D. Turpin 2 C. Tönnis B. Vallage 3, 11 V. van Elewyck 3 F. Versari D. Vivolo A. Vizzoca J. Wilms J.D. Zornoza J. Zúñiga
Abstract : A novel algorithm to reconstruct neutrino-induced particle showers within the ANTARES neutrino telescope is presented. The method achieves a median angular resolution of $6^\circ $ for shower energies below 100 TeV. Applying this algorithm to 6 years of data taken with the ANTARES detector, 8 events with reconstructed shower energies above 10 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 2–4 additional events are expected. A $90\%$ C.L. upper limit on the diffuse astrophysical neutrino flux with a value per neutrino flavour of $\text {E}^2\cdot \Phi ^{90\%} = 4.9 \cdot 10^{-8}\,\mathrm {GeV} \cdot \mathrm {cm^{-2} \cdot s^{-1}\cdot sr^{-1}}$ is set, applicable to the energy range from 23 TeV to 7.8 PeV, assuming an unbroken $\text {E}^{-2}$ spectrum and neutrino flavour equipartition at Earth.
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A. Albert, M. André, M. Anghinolfi, G. Anton, M. Ardid, et al.. An algorithm for the reconstruction of high-energy neutrino-induced particle showers and its application to the ANTARES neutrino telescope. Eur.Phys.J.C, 2017, 77 (6), pp.419. ⟨10.1140/epjc/s10052-017-4979-2⟩. ⟨hal-01554915⟩

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