Constraining sterile neutrinos using reactor neutrino experiments

2014 
Models of neutrino mixing involving one or more sterile neutrinos have res- urrected their importance in the light of recent cosmological data. In this case, reactor antineutrino experiments offer an ideal place to look for signatures of sterile neutrinos due to their impact on neutrino flavor transitions. In this work, we show that the high-precision data of the Daya Bay experiment constrain the 3+1 neutrino scenario imposing upper bounds on the relevant active-sterile mixing angle sin 2 2�14 . 0.06 at 3� confidence level for the mass-squared differencem 2 in the range (10 −3 ,10 −1 )eV 2 . The latter bound can be improved by six years of running of the JUNO experiment, sin 2 2�14 . 0.016, although in the smaller mass rangem 2 ∈ (10 −4 ,10 −3 )eV 2 . We have also investigated the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters �13 andm 2 (at Daya Bay and JUNO), �12 andm 2 (at JUNO), and most importantly, the neutrino mass hierarchy (at JUNO). We find that, except for the obvious situation wherem 2 ∼ �m 2 , sterile states do not affect these measurements substantially.
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