期刊
PHYSICAL REVIEW D
卷 103, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L011101
关键词
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资金
- MEXT, Japan
- NSERC, Canada [SAPPJ-2014-00031]
- NRC, Canada
- CFI, Canada
- CEA, France
- CNRS/IN2P3, France
- DFG, Germany
- INFN, Italy
- National Science Centre, Poland
- Ministry of Science and Higher Education, Poland
- RSF, Russia [19-12-00325]
- Ministry of Science and Higher Education, Russia
- MINECO, Spain
- ERDF funds, Spain
- SNSF, Switzerland
- State Secretary for Research and Innovation (SERI), Switzerland
- STFC, UK
- DOE, USA
- la Caixa Foundation [100010434, LCF/BQ/IN17/11620050]
- European Unions [713673, 754496, RISE-GA822070-JENNIFER2 2020, RISE-GA872549-SK2HK]
- JSPS, Japan
- Royal Society, UK
- French ANR [ANR-19-CE31-0001]
- DOE Early Career program, USA
- ERC (FP7)
- STFC [ST/S000739/1, 1947570, 2119274, ST/S000909/1, 1963041, 2067105, ST/S000933/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/S000879/1] Funding Source: researchfish
The T2K experiment reported measurements of the parameters theta(23) and Delta m(32)(2) that govern the disappearance of muon neutrinos and antineutrinos. The experiment found no significant differences between the values of these parameters for muon neutrinos and antineutrinos. The data were consistent with a physical value for the mixing angle, supporting the three-flavor model of neutrino oscillations.
We report measurements by the T2K experiment of the parameters theta(23) and Delta m(32)(2), which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K's neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from 1.49 x 10(21) protons on target (POT) in neutrino mode and 1.64 x 10(21) POT in antineutrino mode are used. The best-fit values obtained by T2K were sin(2)(theta(23)) = 0.51(-0.07)(+0.06) (0.43(-0.05)(+0.21)) and Delta m(32)(2) = 2.47(-0.09)(+0.08) (2.50(-0.13)(+0.18)) x 10(-3) eV(2)/c(4) for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take nonphysical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.
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