36 research outputs found
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First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA.
The NOvA experiment has seen a 4.4Ļ signal of Ī½[over ĀÆ]_{e} appearance in a 2 GeV Ī½[over ĀÆ]_{Ī¼} beam at a distance of 810 km. Using 12.33Ć10^{20} protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 Ī½[over ĀÆ]_{Ī¼}āĪ½[over ĀÆ]_{e} candidates with a background of 10.3 and 102 Ī½[over ĀÆ]_{Ī¼}āĪ½[over ĀÆ]_{Ī¼} candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Īm_{32}^{2}|=2.48_{-0.06}^{+0.11}Ć10^{-3}āāeV^{2}/c^{4} and sin^{2}Īø_{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 Ī“_{CP}=Ļ/2 for the inverted mass hierarchy by more than 3Ļ and favor the normal neutrino mass hierarchy by 1.9Ļ and Īø_{23} values in the upper octant by 1.6Ļ
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Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector
Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation of cosmic ray induced multiple-muon (NĪ¼ā„2) event rates which has an opposite phase to the seasonal variation in the atmospheric temperature. The strength of the seasonal multiple-muon variation is shown to increase as a function of the muon multiplicity. However, no significant dependence of the strength of the seasonal variation of the multiple-muon variation is seen as a function of the muon zenith angle, or the spatial or angular separation between the correlated muons
Search for slow magnetic monopoles with the NOvA detector on the surface
We report a search for a magnetic monopole component of the cosmic-ray flux in a 95-day exposure
of the NOvA experimentās Far Detector, a 14 kt segmented liquid scintillator detector designed primarily to
observe GeV-scale electron neutrinos. No events consistent with monopoles were observed, setting an
upper limit on the flux of 2 Ć 10ā14 cmā2 sā1 srā1 at 90% C.L. for monopole speed 6 Ć 10ā4 < Ī² <
5 Ć 10ā3 and mass greater than 5 Ć 108 GeV. Because of NOvAās small overburden of 3 meters-water
equivalent, this constraint covers a previously unexplored low-mass region
First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA
The NOvA experiment has seen a 4.4Ļ signal of Ī½Ģe appearance in a 2 GeV Ī½ĢĪ¼ beam at a distance of 810 km. Using 12.33Ć1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 Ī½ĢĪ¼āĪ½Ģe candidates with a background of 10.3 and 102 Ī½ĢĪ¼āĪ½ĢĪ¼ candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Īm322|=2.48-0.06+0.11Ć10-3 eV2/c4 and sin2Īø23 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 Ī“CP=Ļ/2 for the inverted mass hierarchy by more than 3Ļ and favor the normal neutrino mass hierarchy by 1.9Ļ and Īø23 values in the upper octant by 1.6Ļ
First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA
The NOvA experiment has seen a
4.4
Ļ
signal of
ĀÆ
Ī½
e
appearance in a 2 GeV
ĀÆ
Ī½
Ī¼
beam at a distance of 810 km. Using
12.33
Ć
10
20
protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27
ĀÆ
Ī½
Ī¼
ā
ĀÆ
Ī½
e
candidates with a background of 10.3 and 102
ĀÆ
Ī½
Ī¼
ā
ĀÆ
Ī½
Ī¼
candidates. This new antineutrino data are combined with neutrino data to measure the parameters
|
Ī
m
2
32
|
=
2.4
8
+
0.11
ā
0.06
Ć
10
ā
3
ā
ā
eV
2
/
c
4
and
sin
2
Īø
23
in the ranges from (0.53ā0.60) and (0.45ā0.48) in the normal neutrino mass hierarchy. The data exclude most values near
Ī“
C
P
=
Ļ
/
2
for the inverted mass hierarchy by more than
3
Ļ
and favor the normal neutrino mass hierarchy by
1.9
Ļ
and
Īø
23
values in the upper octant by
1.6
Ļ
Measurement of neutrino-induced neutral-current coherent Ļ0 production in the NOvA near detector
The cross section of neutrino-induced neutral-current coherent Ļ0 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 Ļ=13.8Ā±0.9(stat)Ā±2.3(syst)Ć10ā40cm2/nucleus, consistent with model prediction. This result is the most precise measurement of neutral-current coherent Ļ0 production in the few-GeV neutrino energy region
Limits on active to sterile neutrino oscillations from disappearance searches in the MINOS, Daya Bay, and bugey-3 experiments
Searches for a light sterile neutrino have been performed independently by the MINOS and the Daya Bay experiments using the muon (anti)neutrino and electron antineutrino disappearance channels, respectively. In this Letter, results from both experiments are combined with those from the Bugey-3 reactor neutrino experiment to constrain oscillations into light sterile neutrinos. The three experiments are sensitive to complementary regions of parameter space, enabling the combined analysis to probe regions allowed by the Liquid Scintillator Neutrino Detector (LSND) and MiniBooNE experiments in a minimally extended four-neutrino flavor framework. Stringent limits on sin^2 2ĪøĪ¼e are set over 6 orders of magnitude in the sterile mass-squared splitting Īm^2 41. The sterile-neutrino mixing phase space allowed by the LSND and MiniBooNE experiments is excluded for Īm^2 41 < 0.8 eV^2 at 95% CLs