Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam

T2K, Collaboration; Ariga, Akitaka; Ariga, Tomoko; Ereditato, Antonio; Frank, Eike; Hierholzer, Martin; Kreslo, Igor; Messina, Marcello; Martti, Nirkko (2013). Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam. Physical review. D - particles, fields, gravitation, and cosmology, 88(3), 032002. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.88.032002

[img] Text
evidence%20electron.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (8MB) | Request a copy

The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, vertical bar Delta m(32)(2)vertical bar approximate to 2.4 X 10(-3) eV(2). An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3 +/- 0.4(syst) events is expected. The background-only hypothesis is rejected with a p value of 0.0009 (3.1 sigma), and a fit assuming nu(mu) -> nu(e) oscillations with sin (2)2 theta(23) = 1, delta(CP) = 0 and vertical bar Delta m(32)(2)vertical bar = 2.4 X 10(-3) eV(2) yields sin (2)2 theta(13) = 0.088(-0.039)(+0.049)(stat + syst).

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; Ariga, Tomoko; Ereditato, Antonio; Frank, Eike; Hierholzer, Martin; Kreslo, Igor; Messina, Marcello and Martti, Nirkko

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Andrea Stettler

Date Deposited:

11 Sep 2014 08:34

Last Modified:

24 Feb 2016 11:10

Publisher DOI:

10.1103/PhysRevD.88.032002

Web of Science ID:

000322797500004

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.58457

URI:

https://boris.unibe.ch/id/eprint/58457

Actions (login required)

Edit item Edit item
Provide Feedback