Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Jeudi 30 Mars 2017
Heure 16:00
Institut LPT
Salle salle 114, 1er etage, batiment 210
Nom de l'orateur Gupta
Prenom de l'orateur Aritra
Addresse email de l'orateur
Institution de l'orateur Harish-Chandra Research Institute, Allahabad
Titre Astrophysical neutrinos, PeV events at IceCube, and the Direct Detection of Dark Matter
Résumé In this talk, we discuss the implications of the premise that any new, relativistic, highly energetic neutral particle that interacts with quarks and gluons would create cascade-like events in the IceCube (IC) detector which would be observationally indistinguishable from neutral current deep-inelastic (DIS) scattering events due to neutrinos. Consequently, one reason for deviations, breaks or excesses in the expected astrophysical power-law neutrino spectrum could be the flux of such a particle. Motivated by features in the recent 1347-day IceCube high energy starting event (HESE) data, we focus on particular boosted dark matter (\chi) related realizations of this premise, where \chi is assumed to be much lighter than, and the result of, the slow decay of a massive scalar (\phi ) which constitutes a major fraction of the Universe’s dark matter (DM). We show that this hypothesis, coupled with a standard power-law astrophysical neutrino flux is capable of providing very good fits to the present data, along with a possible explanation of other features in the HESE sample : ie, a) the paucity of events beyond 2 PeV b) a spectral feature resembling a dip in the 400 TeV - 1 PeV region and c) an excess in the 50-100 TeV region. We also consider constraints from diffuse gamma ray backgrounds and find that it is indeed very restrictive.
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