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2013-08-19 - Article/Dans un journal avec peer-review - Anglais - 6 page(s)

Kohnen Georges , IceCube Collaboration, "Measurement of Atmospheric Neutrino Oscillations with IceCube " in Physical Review Letters, 111, 8, 081801

  • Edition : American Physical Society, Ridge (NY)
  • Codes CREF : Physique des particules élémentaires (DI1221), Astrophysique (DI1455)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)

Abstract(s) :

(Anglais) We present the first statistically significant detection of neutrino oscillations in the high-energy regime (> 20 GeV) from an analysis of IceCube Neutrino Observatory data collected in 2010-2011. This measurement is made possible by the low energy threshold of the DeepCore detector (∼20 GeV) and benefits from the use of the IceCube detector as a veto against cosmic ray-induced muon background. The oscillation signal was detected within a low-energy muon neutrino sample (20 -- 100 GeV) extracted from data collected by DeepCore. A high-energy muon neutrino sample (100 GeV -- 10 TeV) was extracted from IceCube data to constrain systematic uncertainties. Disappearance of low-energy upward-going muon neutrinos was observed, and the non-oscillation hypothesis is rejected with more than 5σ significance. In a two-neutrino flavor formalism, our data are best described by the atmospheric neutrino oscillation parameters Δm223=(2.3+0.6−0.5)⋅10−3 eV2 and sin2(2θ23)>0.93, and maximum mixing is favored.

Identifiants :
  • DOI : 10.1103/PhysRevLett.111.081801
  • arXiv : 1305.3909