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Étude de la sensibilité du télescope à neutrinos ANTARES aux photons de très haute énergie — Contribution à l'étalonnage en temps du détecteur

Abstract : From the seafloor, the 900-odd photomultiplier tubes of the ANTARES neutrino telescope scrutinize the abysses attempting to discern, amid bioluminescence and marine radioactivity, Čerenkov photons emitted by muons from astrophysical neutrinos, and to distinguish these muons from those generated by air showers produced by cosmic rays. ANTARES has been collecting data since 2006 ; this feat of engineering has paved the way for submarine neutrino astronomy : ANTARES is expected to be the forerunner of a larger instrument, KM3NeT. A telescope's performance is characterized in part by its angular resolution. In the case of ANTARES, the angular resolution is directly related to the time resolution of the detector's elements. This manuscript presents a correction for one of the main sources of deterioration of this time resolution, the walk effect induced by the set up of a fixed threshold for triggering the photomultiplier tubes signal. This correction, implemented in the official software chain of the ANTARES collaboration, improves in particular the events reconstruction quality estimator. This implementation allows further optimizations. The author also attempts to evaluate, using a complete Monte-Carlo simulation, the possibility of using very high energy photon sources as calibrated muon beams in order to estimate the absolute pointing and the angular resolution of the telescope. Although limited by large uncertainties, it is demonstrated that the possibility to detect such sources is extremely small. In addition, it is shown that the atmospheric neutrino background induced by very high-energy photons is negligible.
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Contributor : Goulven Guillard <>
Submitted on : Thursday, January 13, 2011 - 2:46:09 PM
Last modification on : Saturday, June 6, 2020 - 3:25:25 AM
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Goulven Guillard. Étude de la sensibilité du télescope à neutrinos ANTARES aux photons de très haute énergie — Contribution à l'étalonnage en temps du détecteur. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de Strasbourg, 2010. Français. ⟨tel-00555462⟩

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