# Diagnosing the reactor antineutrino anomaly with global antineutrino flux data

Giunti, C. (INFN, Sezione di Torino, Via P. Giuria 1, I10125 Torino, Italy) ; Li, Y. F. (Institute of High Energy Physics, Chinese Academy of Sciences, and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China) ; Littlejohn, B. R. (Physics Department, Illinois Institute of Technology, Chicago, Illinois 60616, USA) ; Surukuchi, P. T. (Physics Department, Illinois Institute of Technology, Chicago, Illinois 60616, USA)

15 April 2019

Abstract: We have examined the impact of new Daya Bay, Double Chooz, and RENO measurements on global fits of reactor antineutrino flux data to a variety of hypotheses regarding the origin of the reactor antineutrino anomaly. In comparing RENO and Daya Bay measurements of inverse beta decay (IBD) yield versus ${}^{239}\mathrm{Pu}$ fission fraction, we find differing levels of precision in measurements of time-integrated yield and yield slope, but similar central values, leading to modestly enhanced isotopic IBD yield measurements in a joint fit of the two datasets. In the absence of sterile neutrino oscillations, global fits to all measurements now provide $3\sigma$ preference for incorrect modeling of specific fission isotopes over common mismodeling of all beta-converted isotopes. If sterile neutrino oscillations are considered, global IBD yield fits provide no substantial preference between oscillation-including and oscillation-excluding hypotheses: hybrid models containing both sterile neutrino oscillations and incorrect ${}^{235}U$ or ${}^{239}\mathrm{Pu}$ flux predictions are favored at only $1\sigma –2\sigma$ with respect to models where ${}^{235}U$, ${}^{238}U$, and ${}^{239}\mathrm{Pu}$ are assumed to be incorrectly predicted.

Published in: Physical Review D 99 (2019)