T2K measurements of muon neutrino and antineutrino disappearance using 3.13x10^21 protons on target

Ereditato, Antonio; Francois, Conor Neil; Pistillo, Ciro; Wilkinson, Callum (2021). T2K measurements of muon neutrino and antineutrino disappearance using 3.13x10^21 protons on target. Physical review. D - particles, fields, gravitation, and cosmology, 103(1) American Physical Society 10.1103/PhysRevD.103.L011101

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We report measurements by the T2K experiment of the parameters theta23 and Delta_m32^2, which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K’s neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from 1.49×10^21 protons on target (POT) in neutrino mode and 1.64×10^21 POT in antineutrino mode are used. The best-fit values obtained by T2K were sin^2(θ23)=0.51-0.07+0.06(0.43-0.05+0.21) and Delta_m32^2=2.47-0.09+0.08(2.50-0.13+0.18)×10^-3  e^V2/c^4 for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take nonphysical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.

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:

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

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Ciro Pistillo

Date Deposited:

31 Mar 2021 15:47

Last Modified:

01 Apr 2021 17:44

Publisher DOI:

10.1103/PhysRevD.103.L011101

ArXiv ID:

2008.07921v2

Additional Information:

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

BORIS DOI:

10.48350/153030

URI:

https://boris.unibe.ch/id/eprint/153030

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