Constraint on the solar Δm2 using 4000 days of short baseline reactor neutrino data constraint on the solar Δm2 using ... Hernandez Cabezudo, Parke, and SEO

Abstract

© 2019 authors. Published by the American Physical Society.There is a well-known 2σ tension in the measurements of the solar Δm2 between KamLAND and SNO/Super-KamioKANDE. Precise determination of the solar Δm2 is especially important in connection with current and future long baseline CP violation measurements. Seo and Parke [Phys. Rev. D 99, 033012 (2019)PRVDAQ2470-001010.1103/PhysRevD.99.033012] points out that currently running short baseline reactor neutrino experiments, Daya Bay and RENO, can also constrain solar Δm2 value as demonstrated by a GLoBES simulation with a limited systematic uncertainty consideration. In this work, the publicly available data, from Daya Bay (1958 days) and RENO (2200 days) are used to constrain the solar Δm2. Verification of our method through Δmee2 and sin2θ13 measurements is discussed in Appendix A. Using this verified method, reasonable constraints on the solar Δm2 are obtained using above Daya Bay and RENO data, both individually and combined. We find that the combined data of Daya Bay and RENO set an upper limit on the solar Δm2 of 18×10-5 eV2 at the 95% C.L., including both systematic and statistical uncertainties. This constraint is slightly more than twice the KamLAND value. As this combined result is still statistics limited, even though driven by Daya Bay data, the constraint will improve with the additional running of this experiment