Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam

Ariga, Akitaka; Ereditato, Antonio; Francois, Conor Neil; Pistillo, Ciro; Wilkinson, Callum (2020). Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam. Physical review letters, 124(16) American Physical Society 10.1103/PhysRevLett.124.161802

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Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Ariga, Akitaka; Ereditato, Antonio; Francois, Conor Neil; Pistillo, Ciro and Wilkinson, Callum

Subjects:

500 Science > 530 Physics

ISSN:

0031-9007

Publisher:

American Physical Society

Language:

English

Submitter:

Ciro Pistillo

Date Deposited:

01 Apr 2021 17:41

Last Modified:

04 Apr 2021 03:06

Publisher DOI:

10.1103/PhysRevLett.124.161802

Additional Information:

The T2K Collaboration. Es sind nur die Berner AutorInnen namentlich erwähnt.

BORIS DOI:

10.48350/153849

URI:

https://boris.unibe.ch/id/eprint/153849

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