Phys. Rev. Lett. 118, 151802 (2017) This Letter reports new results on muon neutrino disappearance from NOvA,
using a 14 kton detector equivalent exposure of $6.05\times10^{20}$
protons-on-target ...from the NuMI beam at the Fermi National Accelerator
Laboratory. The measurement probes the muon-tau symmetry hypothesis that
requires maximal mixing ($\theta_{23} = \pi/4$). Assuming the normal mass
hierarchy, we find $\Delta m^2 = (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and
$\sin^2 \theta_{23}$ at the two statistically degenerate values
$0.404^{+0.030}_{-0.022}$ and $0.624^{+0.022}_{-0.030}$, both at the 68%
confidence level. Our data disfavor the maximal mixing scenario with 2.6
$\sigma$ significance.
The cross section of neutrino-induced neutral-current coherent \(\pi^0\) production on a carbon-dominated target is measured in the NOvA near detector. This measurement uses a narrow-band neutrino ...beam with an average neutrino energy of 2.7\,GeV, which is of interest to ongoing and future long-baseline neutrino oscillation experiments. The measured, flux-averaged cross section is \(\sigma = 13.8\pm0.9 (\text{stat})\pm2.3 (\text{syst}) \times 10^{-40}\,\text{cm}^2/\text{nucleus}\), consistent with model prediction. This result is the most precise measurement of neutral-current coherent \(\pi^0\) production in the few-GeV neutrino energy region.
We report results from the first search for \(\nu_\mu\to\nu_e\) transitions by the NOvA experiment. In an exposure equivalent to \(2.74\times10^{20}\) protons-on-target in the upgraded NuMI beam at ...Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of \(0.99\pm0.11\) (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of \(1.07\pm0.14\) (syst.). The \(3.3\sigma\) excess of events observed in the primary analysis disfavors \(0.1\pi < \delta_{CP} < 0.5\pi\) in the inverted mass hierarchy at the 90% C.L.
This paper reports the first measurement using the NOvA detectors of \(\nu_\mu\) disappearance in a \(\nu_\mu\) beam. The analysis uses a 14 kton-equivalent exposure of \(2.74 \times 10^{20}\) ...protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure \(\Delta m^{2}_{32}=(2.52^{+0.20}_{-0.18})\times 10^{-3}\) eV\(^{2}\) and \(\sin^2\theta_{23}\) in the range 0.38-0.65, both at the 68% confidence level, with two statistically-degenerate best fit points at \(\sin^2\theta_{23} = \) 0.43 and 0.60. Results for the inverted mass hierarchy are also presented.
Results are reported from an improved measurement of \(\nu_\mu \rightarrow \nu_e\) transitions by the NOvA experiment. Using an exposure equivalent to \(6.05\times10^{20}\) protons-on-target 33 ...\(\nu_e\) candidates were observed with a background of \(8.2\pm0.8\) (syst.). Combined with the latest NOvA \(\nu_\mu\) disappearance data and external constraints from reactor experiments on \(\sin^22\theta_{13}\), the hypothesis of inverted mass hierarchy with \(\theta_{23}\) in the lower octant is disfavored at greater than \(93\%\) C.L. for all values of \(\delta_{CP}\).
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of \(6.05\times10^{20}\) protons-on-target from the NuMI beam at the Fermi ...National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal mixing (\(\theta_{23} = \pi/4\)). Assuming the normal mass hierarchy, we find \(\Delta m^2 = (2.67 \pm 0.11)\times 10^{-3}\) eV\(^2\) and \(\sin^2 \theta_{23}\) at the two statistically degenerate values \(0.404^{+0.030}_{-0.022}\) and \(0.624^{+0.022}_{-0.030}\), both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 \(\sigma\) significance.
Phys. Rev. D 98, 032012 (2018) We present updated results from the NOvA experiment for
$\nu_\mu\rightarrow\nu_\mu$ and $\nu_\mu\rightarrow\nu_e$ oscillations from an
exposure of $8.85\times10^{20}$ ...protons on target, which represents an increase
of 46% compared to our previous publication. The results utilize significant
improvements in both the simulations and analysis of the data. A joint fit to
the data for $\nu_\mu$ disappearance and $\nu_e$ appearance gives the best fit
point as normal mass hierarchy, $\Delta m^2_{32} = 2.44\times 10^{-3}{{\rm
eV}^2}/c^4$, $\sin^2\theta_{23} = 0.56$, and $\delta_{CP} = 1.21\pi$. The 68.3%
confidence intervals in the normal mass hierarchy are $\Delta m^2_{32} \in
2.37,2.52\times 10^{-3}{{\rm eV}^2}/c^4$, $\sin^2\theta_{23} \in 0.43,0.51
\cup 0.52,0.60$, and $\delta_{CP} \in 0,0.12\pi \cup 0.91\pi,2\pi$. The
inverted mass hierarchy is disfavored at the 95% confidence level for all
choices of the other oscillation parameters.
We present status of a search for two rare of the Z boson, Z0 → J/ψγ and Z0 → Υγ at CDF. The state of analysis is described at the time of this worksop.
We present status of a search for two rare of the Z boson, Z super(0) arrow right J/psi gamma and Z super(0) arrow right Upsilon gamma at CDF. The state of analysis is described at the time of this ...worksop.
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