We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43×1020 protons on target, we observe 31 fully-contained single μ-like ring events in Super-Kamiokande, compared with an expectation of 104±14 (syst) events without neutrino oscillations. The best-fit point for two-flavor νμ→ντ oscillations is sin⁡2(2θ23)=0.98 and |Δm322|=2.65×10-3  eV2. The boundary of the 90% confidence region includes the points (sin⁡2(2θ23),|Δm322|)=(1.0,3.1×10-3  eV2), (0.84, 2.65×10-3  eV2) and (1.0, 2.2×10-3  eV2).

First muon-neutrino disappearance study with an off-axis beam / Abe, K., Abgrall, N., Ajima, Y., Aihara, H., Albert, J.b., Andreopoulos, C., Andrieu, B., Anerella, M.d., Aoki, S., Araoka, O., Argyriades, J., Ariga, A., Ariga, T., Assylbekov, S., Autiero, D., Badertscher, A., Barbi, M., Barker, G.j., Barr, G., Bass, M., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 85:3(2012). [10.1103/PhysRevD.85.031103]

First muon-neutrino disappearance study with an off-axis beam

BERARDI, Vincenzo;MAGALETTI, Lorenzo;
2012

Abstract

We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43×1020 protons on target, we observe 31 fully-contained single μ-like ring events in Super-Kamiokande, compared with an expectation of 104±14 (syst) events without neutrino oscillations. The best-fit point for two-flavor νμ→ντ oscillations is sin⁡2(2θ23)=0.98 and |Δm322|=2.65×10-3  eV2. The boundary of the 90% confidence region includes the points (sin⁡2(2θ23),|Δm322|)=(1.0,3.1×10-3  eV2), (0.84, 2.65×10-3  eV2) and (1.0, 2.2×10-3  eV2).
2012
First muon-neutrino disappearance study with an off-axis beam / Abe, K., Abgrall, N., Ajima, Y., Aihara, H., Albert, J.b., Andreopoulos, C., Andrieu, B., Anerella, M.d., Aoki, S., Araoka, O., Argyriades, J., Ariga, A., Ariga, T., Assylbekov, S., Autiero, D., Badertscher, A., Barbi, M., Barker, G.j., Barr, G., Bass, M., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 85:3(2012). [10.1103/PhysRevD.85.031103]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/11505
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