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

Ariga, Akitaka; Ereditato, Antonio; Hierholzer, Martin; Nirkko, Martti; Pistillo, Ciro; Redij, Asmita Ajit; Wilkinson, Callum (2016). Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam. Physical review letters, 116(18), p. 181801. American Physical Society 10.1103/PhysRevLett.116.181801

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T2K reports its first measurements of the parameters governing the disappearance of νµ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic νµ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector SuperKamiokande, 295 km away, where the νµ survival probability is expected to be minimal. Using a dataset corresponding to 4.01×10²⁰ protons on target, 34 fully contained µ-like events were observed. The best-fit oscillation parameters are sin²(θ₂₃) = 0.45 and |∆m^2_32| = 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Ariga, Akitaka; Ereditato, Antonio; Hierholzer, Martin; Nirkko, Martti; Pistillo, Ciro; Redij, Asmita Ajit and Wilkinson, Callum

Subjects:

500 Science > 530 Physics

ISSN:

0031-9007

Publisher:

American Physical Society

Language:

English

Submitter:

Ciro Pistillo

Date Deposited:

06 Jul 2016 07:59

Last Modified:

06 Jul 2016 07:59

Publisher DOI:

10.1103/PhysRevLett.116.181801

Additional Information:

Kollaboration. Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.82761

URI:

https://boris.unibe.ch/id/eprint/82761

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