Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Astroparticle Physics 634-640 Magnetic monopole Neutrino telescopes ANTARES 2012 fdi:010055904 ENG Astroparticle Physics 0927-6505 ISI:000304220600005 10 10.1016/j.astropartphys.2012.02.007 https://www.documentation.ird.fr/hor/fdi:010055904 https://www.documentation.ird.fr/intranet/publi/2012/06/010055904.pdf 35 Horizon (IRD) Magnetic monopoles are predicted in various unified gauge models and could be produced at intermediate mass scales. Their detection in a neutrino telescope is facilitated by the large amount of light emitted compared to that from muons. This paper reports on a search for upgoing relativistic magnetic monopoles with the ANTARES neutrino telescope using a data set of 116 days of live time taken from December 2007 to December 2008. The one observed event is consistent with the expected atmospheric neutrino and muon background, leading to a 90% C.L. upper limit on the monopole flux between 1.3 x 10-(17) and 8.9 x 10(-17) CM-2 s(-1) sr(-1) for monopoles with velocity beta >= 0.625. 020 ; 060 UR082