COSMOVIA - Virtual Institute of Astroparticle Physics /IN THE NEWS /OBSERVATION OF ELECTRON NEUTRINO APPEARANCE IN A MUON NEUTRINO BEAM

Credits

K. Abe, J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A.
Ariga, T. Ariga, S. Assylbekov, D. Autiero, M. Barbi, G. J. Barker, G. Barr,
M. Bass, M. Batkiewicz, F. Bay, S. W. Bentham, V. Berardi, B. E. Berger, S.
Berkman, I. Bertram, S. Bhadra, F. d. M. Blaszczyk, A. Blondel, C. Bojechko,
S. Bordoni, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, N. Buchanan, R.
G. Calland, J. Caravaca Rodr\'iguez, S. L. Cartwright, R. Castillo, M. G.
Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, A. Clifton, J. Coleman,
S. J. Coleman, G. Collazuol, K. Connolly, L. Cremonesi, A. Dabrowska, I.
Danko, R. Das, S. Davis, P. de Perio, G. De Rosa, T. Dealtry, S. R. Dennis,
C. Densham, F. Di Lodovico, S. Di Luise, O. Drapier, T. Duboyski, K. Duffy,
F. Dufour, J. Dumarchez, S. Dytman, M. Dziewiecki, et al. (275 additional
authors not shown)

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Observation of Electron Neutrino Appearance in a Muon Neutrino Beam

November, 19, 2013

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV...

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3$\sigma$ when compared to 4.92 $\pm$ 0.55 expected background events.

In the PMNS mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles $\theta_{12}$, $\theta_{23}$, $\theta_{13}$, a mass difference $\Delta m^2_{32}$ and a CP violating phase $\delta_{\mathrm{CP}}$. In this neutrino oscillation scenario, assuming $|\Delta m^2_{32}| = 2.4 \times 10^{-3}$ $\rm
eV^2$, $\sin^2 \theta_{23} = 0.5$, $\delta_{\mathrm{CP}}=0$, and $\Delta m^2_{32} >0$ ($\Delta m^2_{32} <0$), a best-fit value of $\sin^2 2 \theta_{13}$ = $0.140^{+0.038}_{-0.032}$ ($0.170^{+0.045}_{-0.037}$) is obtained. \\ ( http://arxiv.org/abs/1311.4750 , 60kb)

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