Abstract
The NOvA experiment has seen a 4.4σ signal of ν[over ¯]_{e} appearance in a 2GeV ν[over ¯]_{μ} beam at a distance of 810km. Using 12.33×10^{20} protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 ν[over ¯]_{μ}→ν[over ¯]_{e} candidates with a background of 10.3 and 102 ν[over ¯]_{μ}→ν[over ¯]_{μ} candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Δm_{32}^{2}|=2.48_{-0.06}^{+0.11}×10^{-3} eV^{2}/c^{4} and sin^{2}θ_{23} in the ranges from (0.53-0.60) and (0.45-0.48) in the normal neutrino mass hierarchy. The data exclude most values near δ_{CP}=π/2 for the inverted mass hierarchy by more than 3σ and favor the normal neutrino mass hierarchy by 1.9σ and θ_{23} values in the upper octant by 1.6σ.
Highlights
Best fit ObservedNeutrino beam νμ CC νe CC119.7þ−1110..82 4.2þ−00..6544.3þ−43..05 15.0þ−00..98Antineutrino beam νμ CC93.9þ−88..21 2.2þ−00..4416.6þ−10..09 10.3þ−00..56Δm221=ð10−5 eV2=c4Þ sin2 θ12 sin2 θ137.53 Æ 0.18 0.307þ−00..001123 0.0210 Æ 0.0011NH, UO NH, LO inverted hierarchy” (IH), UO IH, LOΔm232=ð10−3 eV2=c4Þ sin2 θ23
Using 12.33 × 1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 νμ → νe candidates with a background of 10.3 and 102 νμ → νμ candidates
We model multinucleon ejection interactions following Ref. [54] and adjust the rates in bins of energy transfer, q0, and three-momentum transfer, jq⃗ j, for νμ and νμ separately to maximize agreement in the near detector (ND)
Summary
Using 12.33 × 1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 νμ → νe candidates with a background of 10.3 and 102 νμ → νμ candidates This new antineutrino data are combined with neutrino data to measure the parameters jΔm232j 1⁄4 2.48þ−00..0161 × 10−3 eV2=c4 and sin θ23 in the ranges from (0.53–0.60) and (0.45–0.48) in the normal neutrino mass hierarchy. The selection of νμ and νμ CC events is 31.2% (33.9%) efficient for true interactions in the fiducial volume, resulting in 98.6% (98.8%) pure samples at the FD during neutrino (antineutrino) beam operation. Both νμ and νμ are counted as a signal for the disappearance measurements. The wrong-sign component of the selected νμ sample in the ND is calculated to be
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