Publications by authors named "I Kourbanis"

We present the first results of the Fermilab National Accelerator Laboratory (FNAL) Muon g-2 Experiment for the positive muon magnetic anomaly a_{μ}≡(g_{μ}-2)/2. The anomaly is determined from the precision measurements of two angular frequencies. Intensity variation of high-energy positrons from muon decays directly encodes the difference frequency ω_{a} between the spin-precession and cyclotron frequencies for polarized muons in a magnetic storage ring.

View Article and Find Full Text PDF

The NOvA experiment has seen a 4.4σ signal of ν[over ¯]_{e} appearance in a 2 GeV ν[over ¯]_{μ} beam at a distance of 810 km. Using 12.

View Article and Find Full Text PDF
Article Synopsis
  • The NOvA experiment improved measurements of muon neutrino (ν_{μ}) to electron neutrino (ν_{e}) transitions, detecting 33 ν_{e} candidates amid a background of 8.2±0.8.
  • Combining this data with recent ν_{μ} disappearance results and reactor experiment constraints,
  • the study disfavored the inverted mass hierarchy scenario for neutrino mixing at over 93% confidence level across all values of the CP-violating phase (δ_{CP}).
View Article and Find Full Text PDF

This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05×10^{20} protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal θ_{23} mixing (θ_{23}=π/4).

View Article and Find Full Text PDF

We report results from the first search for ν_{μ}→ν_{e} transitions by the NOvA experiment. In an exposure equivalent to 2.74×10^{20} protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of 0.

View Article and Find Full Text PDF