New results on ν μ → ν τ appearance with the OPERA experiment in the CNGS beam

Agafonova, N.; Aleksandrov, A.; Anokhina, A.; Aoki, S.; Ariga, Akitaka; Ariga, Tomoko; Asada, T.; Autiero, D.; Badertscher, A.; Ben Dhahbi, A.; Bender, D.; Bertolin, A.; Bozza, C.; Brugnera, R.; Brunetti, G.; Büttner, B.; Buontempo, S.; Chaussard, L.; Chernyavskiy, M.; Chiarella, V.; ... (2013). New results on ν μ → ν τ appearance with the OPERA experiment in the CNGS beam. Journal of High Energy Physics, 2013(11) Springer 10.1007/JHEP11(2013)036

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The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the νμ→ντ channel, via the detection of the τ-leptons created in charged current ντ interactions. The detector, located in the underground Gran Sasso Laboratory, consists of an emulsion/lead target with an average mass of about 1.2 kt, complemented by electronic detectors. It is exposed to the CERN Neutrinos to Gran Sasso beam, with a baseline of 730 km and a mean energy of 17 GeV. The observation of the first ντ candidate event and the analysis of the 2008-2009 neutrino sample have been reported in previous publications. This work describes substantial improvements in the analysis and in the evaluation of the detection efficiencies and backgrounds using new simulation tools. The analysis is extended to a sub-sample of 2010 and 2011 data, resulting from an electronic detector-based pre-selection, in which an additional ντ candidate has been observed. The significance of the two events in terms of a νμ→ντ oscillation signal is of 2.40 σ.

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; Hierholzer, Martin; Kawada, Jiro; Kimura, Mitsuhiro; Kreslo, Igor; Pistillo, Ciro; Strauss, Thomas; Tufanli, Serhan and Vuilleumier, Jean-Luc

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Elena Kirillova

Date Deposited:

25 Sep 2014 16:45

Last Modified:

10 Dec 2014 01:17

Publisher DOI:

10.1007/JHEP11(2013)036

Web of Science ID:

000326719900001

ArXiv ID:

1308.2553v1

BORIS DOI:

10.7892/boris.48919

URI:

https://boris.unibe.ch/id/eprint/48919

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