T2K reports its first measurements of the parameters governing the disappearance of ν-μ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ν-μ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ν-μ survival probability is expected to be minimal. Using a data set corresponding to 4.01×1020 protons on target, 34 fully contained μ-like events were observed. The best-fit oscillation parameters are sin2(θ-23)=0.45 and |Δm-322|=2.51×10-3 eV2 with 68% confidence intervals of 0.38-0.64 and 2.26-2.80×10-3 eV2, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the νμ disappearance parameters measured by T2K.

Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam / Abe, K., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Barbi, M., Barker, G.J., Barr, G., Bartet Friburg, P., Batkiewicz, M., Bay, F., Berardi, V., Berkman, S., Bhadra, S., Blondel, A., Bolognesi, S., Bordoni, S., Boyd, S.B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:18(2016). [10.1103/PhysRevLett.116.181801]

Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

BERARDI, Vincenzo;MAGALETTI, Lorenzo;
2016

Abstract

T2K reports its first measurements of the parameters governing the disappearance of ν-μ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ν-μ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ν-μ survival probability is expected to be minimal. Using a data set corresponding to 4.01×1020 protons on target, 34 fully contained μ-like events were observed. The best-fit oscillation parameters are sin2(θ-23)=0.45 and |Δm-322|=2.51×10-3 eV2 with 68% confidence intervals of 0.38-0.64 and 2.26-2.80×10-3 eV2, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the νμ disappearance parameters measured by T2K.
2016
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.181801
Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam / Abe, K., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Barbi, M., Barker, G.J., Barr, G., Bartet Friburg, P., Batkiewicz, M., Bay, F., Berardi, V., Berkman, S., Bhadra, S., Blondel, A., Bolognesi, S., Bordoni, S., Boyd, S.B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:18(2016). [10.1103/PhysRevLett.116.181801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/110545
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