Galati, G. and Agafonova, N. and Aleksandrov, A. and Anokhina, A. and Aoki, S. (2017) More results from the OPERA experiment. Il nuovo cimento C, 40 (5). pp. 1-8. ISSN 1826-9885
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Abstract
The OPERA experiment reached its main goal by proving the appearance of ντ in the CNGS νμ beam. Five ντ candidates were detected with a S/B ratio of ∼ 10, allowing to reject the null hypothesis at 5.1σ. The search has been extended by loosening the selection criteria in order to improve the statistical uncertainty. One of the ντ candidates selected with the new strategy shows a double vertex topology and, after a dedicated multivariate analysis, is compatible with being a ντ interaction with charm production. Based on the enlarged data sample the estimation of Δm2 23 in appearance mode is being performed. The search for νe interactions has been extended over the full data set with a more than twofold increase in statistics: data are compatible with the non-oscillation hypothesis in the three-flavour mixing model. The implications of the electron neutrino sample in the framework of the 3+1 sterile mode will lead to exclusion limits on sin2 2θμe. Finally, the analysis of the annual modulation of cosmic muons is introduced.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 17 Nov 2020 10:30 |
| Last Modified: | 17 Nov 2020 10:30 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/20049 |
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