Statut  Confirmé 
Série  LPTPTH 
Domaines  hepph 
Date  Jeudi 19 Octobre 2017 
Heure  16:15 
Institut  LPT 
Salle  114 
Nom de l'orateur  HernandezCabezudo 
Prenom de l'orateur  Alvaro 
Addresse email de l'orateur  
Institution de l'orateur  KIT Karlsruhe 
Titre  Status of the reactor anomaly 
Résumé  The measurements of antineutrinos fluxes coming from nuclear reactors present a deficit with respect to the theoretical predictions, what is known as the reactor antineutrino anomaly. A new neutrino mass eigenstate in the eV range could solve the problem, although recent experimental results : the existence of an unpredicted bump in the reactor antineutrino spectrum and the dependance of the flux deficit on the fission isotopes ; suggest a miscalculation on the fluxes, disfavoring the sterile neutrino hypothesis. Using all electron disappearance data available, it is found that the sterile neutrino hypothesis can not be rejected. Based on that, a global analysis, using the theoretical flux predictions, gives a 3 sigma significance to the sterile oscillation with respect to the no oscillation. A more conservative analysis of the sterile oscillation, not taking any assumption for the fluxes i.e. leaving the fluxes to vary freely, also gives a 2 sigma significance for the sterile oscillation. Being the sterile neutrino hypothesis still compatible with the reactor anomaly. In this talk I will introduce the reactor anomaly and the new experimental results in order to explain the reactor data analysis as well as the global electron neutrino disappearance analysis performed. Reference : https://arxiv.org/abs/1709.04294 
Numéro de preprint arXiv  
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