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The em algorithm applied to the search of high energy neutrino sources

par Aguilar Sanchez, Juan Antonio ;Hernández-Rey, Juan José
Référence ICRC 2007(3-11 July 2007: Merida, Yucatan; Mexico), Proceedings of the 30th International Cosmic Ray Conference, Universidad Nacional Autonoma de Mexico, Vol. 4, page (809-812)
Publication Publié, 2007

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Résumé :

The detection of astrophysical sources of high energy neutrinos is one of the most sought-after experimental goals in present astroparticle physics. The low number of signal events expected in high energy neutrino telescopes calls for powerful algorithms to disentangle clusters of small number of events from the background. In this contribution we explore the potentiality of the Expectation-Maximisation algorithm (EM) for the search of neutrino point-like sources in a generic kilometre-scale neutrino telescope located in the Mediterranean sea. The EMalgorithm, widely used in clustering analysis, has been adapted in this work to the special case of low signal statistics in a relatively high background. We describe here how the problem has been tackled and compare our results to the well-known binning technique. The method can also be applied to other similar problems like for instance the search of nearby ultra-high energy cosmic-ray sources.