Etude de la détection de monopôles magnétiques au sein du futur télescope à neutrinos ANTARES et caractérisation des performances du traitement des impulsions des photomultiplicateurs

Abstract : Grand unified theories (GUT) involve phase transitions in the early universe, that could create topological defects, like magnetic monopoles. Monopoles main characteristics are shown and in particular energy losses and flux limits. High energy neutrino telescopes offer a new opportunity for magnetic monopole search. The study of the photomultiplier pulse treatment by the Antares detector front-end electronics indicates that this one is well adapted to the telescope needs. The pulses detailled analysis has allowed to obtain a time measurement precision lower than 0.6 ns and electronic noise and saturation have no relevant effect on the telescope performances. Relativistic monopoles generate a large amount of light, that leads to an effective area for the Antares detector of about 0.06 km2 for velocities beta_mon = 0.6 and 0.35 km2 for velocities beta_mon ~ 1. Monopole track are well reconstructed and the velocity determination is made with an error lower than few percents, which represents a decisive result for the background rejection, caused by high energy muons with a velocity beta_mu ~ 1. The very dispersive light emission of monopoles below the Tcherenkov limit, 0.6 < beta_mon < 0.74, via the delta-rays produced by ionisation, does not allow an accurate expective signal and the bad reconstructed muons rejection must be improved. Above the Tcherenkov limit, beta_mon > 0.8, bad reconstructed events can be rejected from the Tcherenkov emission parametrisation. A magnetic monopole signal can then clearly be distinguished from background.
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Jean-Stéphane Ricol. Etude de la détection de monopôles magnétiques au sein du futur télescope à neutrinos ANTARES et caractérisation des performances du traitement des impulsions des photomultiplicateurs. Astrophysique [astro-ph]. Université de la Méditerranée - Aix-Marseille II, 2002. Français. ⟨tel-00002626⟩

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