Precise measurement of the neutrino mixing parameter θ23 from muon neutrino disappearance in an off-axis beam

T2K Collaboration

Research output: Contribution to journalArticle

154 Citations (Scopus)

Abstract

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 1020 protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin223) is 0.514-0.056+0.055 (0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm322 = (2.51 × 0.10) × 10-3 eV2/c4 (inverted hierarchy: Δm13 = (2.48 ± 0.10) × 10-3 eV2/c4). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.

Original languageEnglish
Article number181801
JournalPhysical Review Letters
Volume112
Issue number18
DOIs
Publication statusPublished - May 8 2014

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muons
neutrinos
hierarchies
oscillations
confidence limits
neutrino beams
energy
protons
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Precise measurement of the neutrino mixing parameter θ23 from muon neutrino disappearance in an off-axis beam. / T2K Collaboration.

In: Physical Review Letters, Vol. 112, No. 18, 181801, 08.05.2014.

Research output: Contribution to journalArticle

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title = "Precise measurement of the neutrino mixing parameter θ23 from muon neutrino disappearance in an off-axis beam",
abstract = "New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 1020 protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68{\%} confidence limit on sin2(θ23) is 0.514-0.056+0.055 (0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm322 = (2.51 × 0.10) × 10-3 eV2/c4 (inverted hierarchy: Δm13 = (2.48 ± 0.10) × 10-3 eV2/c4). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.",
author = "{T2K Collaboration} and K. Abe and J. Adam and H. Aihara and T. Akiri and C. Andreopoulos and S. Aoki and A. Ariga and T. Ariga and S. Assylbekov and D. Autiero and M. Barbi and Barker, {G. J.} and G. Barr and M. Bass and M. Batkiewicz and F. Bay and Bentham, {S. W.} and V. Berardi and Berger, {B. E.} and S. Berkman and I. Bertram and S. Bhadra and Blaszczyk, {F. D M} and A. Blondel and C. Bojechko and S. Bordoni and Boyd, {S. B.} and D. Brailsford and A. Bravar and C. Bronner and N. Buchanan and Calland, {R. G.} and {Caravaca Rodr{\'i}guez}, J. and Cartwright, {S. L.} and R. Castillo and Catanesi, {M. G.} and A. Cervera and D. Cherdack and G. Christodoulou and A. Clifton and J. Coleman and Coleman, {S. J.} and G. Collazuol and K. Connolly and L. Cremonesi and A. Dabrowska and I. Danko and R. Das and S. Davis and Yusuke Koshio",
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AU - T2K Collaboration

AU - Abe, K.

AU - Adam, J.

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AU - Akiri, T.

AU - Andreopoulos, C.

AU - Aoki, S.

AU - Ariga, A.

AU - Ariga, T.

AU - Assylbekov, S.

AU - Autiero, D.

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AU - Barker, G. J.

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AU - Bass, M.

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AU - Berger, B. E.

AU - Berkman, S.

AU - Bertram, I.

AU - Bhadra, S.

AU - Blaszczyk, F. D M

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AU - Bojechko, C.

AU - Bordoni, S.

AU - Boyd, S. B.

AU - Brailsford, D.

AU - Bravar, A.

AU - Bronner, C.

AU - Buchanan, N.

AU - Calland, R. G.

AU - Caravaca Rodríguez, J.

AU - Cartwright, S. L.

AU - Castillo, R.

AU - Catanesi, M. G.

AU - Cervera, A.

AU - Cherdack, D.

AU - Christodoulou, G.

AU - Clifton, A.

AU - Coleman, J.

AU - Coleman, S. J.

AU - Collazuol, G.

AU - Connolly, K.

AU - Cremonesi, L.

AU - Dabrowska, A.

AU - Danko, I.

AU - Das, R.

AU - Davis, S.

AU - Koshio, Yusuke

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N2 - New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 1020 protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin2(θ23) is 0.514-0.056+0.055 (0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm322 = (2.51 × 0.10) × 10-3 eV2/c4 (inverted hierarchy: Δm13 = (2.48 ± 0.10) × 10-3 eV2/c4). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.

AB - New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 1020 protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin2(θ23) is 0.514-0.056+0.055 (0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm322 = (2.51 × 0.10) × 10-3 eV2/c4 (inverted hierarchy: Δm13 = (2.48 ± 0.10) × 10-3 eV2/c4). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.

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