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Physical Review D 83 (2011) 073006
Reactor Antineutrino Anomaly
G. Mention1, M. Fechner1, T. Lasserre1, 2, Th. A. Mueller3, D. Lhuillier3, M. Cribier1, 2, A. Letourneau3

Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. To good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances <100 m leads to a ratio of observed event rate to predicted rate of 0.979(0.029). With our new flux evaluation, this ratio shifts to 0.937(0.027), leading to a deviation from unity at 98.4% C.L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth non-standard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNE-neutrino data disfavors the no-oscillation hypothesis at 99.93% C.L. The oscillation parameters are such that |Delta m_{new}^2|>1.5 eV^2 (99%) and sin^2(2\theta_{new})=0.17(0.1) (95%). Constraints on the theta13 neutrino mixing angle are revised.
1 :  SPP - Service de Physique des Particules
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  SPhN - Service de Physique Nucléaire
APC - Neutrinos
Physique/Physique des Hautes Energies - Expérience

Physique/Physique des Hautes Energies - Phénoménologie
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