Muon neutrino disappearance at T2K

Topical Research Meeting: Prospects in Neutrino Physics

Dealtry, T.^1,2

STFC, Rutherford Appleton Laboratory, Harwell, Oxford, United Kingdom^1

Department of Physics, University of Oxford, Oxford, United Kingdom^2

关键词: Best fit;    Constant density;    Energy spectra;    Mass hierarchy;    Mixing angle;    Muon neutrino;    Neutrino oscillations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/598/1/012018/pdf
DOI  :  10.1088/1742-6596/598/1/012018

来源: IOP

【 摘 要 】

The T2K experiment has observed the disappearance of muon neutrinos from the J-PARC muon-neutrino beam. Using data corresponding to 3.01 × 1020protons on target, 58 muon neutrino event candidates were observed; 205 ± 17 (syst.) events are expected under the no-oscillation hypothesis. A fit to the observed rate and energy spectrum in a neutrino oscillation framework with three active neutrino flavours in constant density matter, assuming the normal mass hierarchy, yields a best fit mixing angle sin2θ23= 0.514 ± 0.082 and best fit mass squared splitting |Δm232| = 2.44+0.17-0.15× 10-3eV2/c4, which corresponds to the maximal disappearance probability.