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Reassessing the sensitivity to leptonic CP violation
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0001-5948-9152
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 3, 005Article in journal (Refereed) Published
Abstract [en]

We address the validity of the usual procedure to determine the sensitivity of neutrino oscillation experiments to CP violation. An explicit calibration of the test statistic is performed through Monte Carlo simulations for several experimental setups. We find that significant deviations from a chi(2) distribution with one degree of freedom occur for experimental setups with low sensitivity to ffi. In particular, when the allowed region to which ffi is constrained at a given confidence level is comparable to the whole allowed range, the cyclic nature of the variable manifests and the premises of Wilk's theorem are violated. This leads to values of the test statistic significantly lower than a chi(2) distribution at that confidence level. On the other hand, for facilities which can place better constraints on ffi the cyclic nature of the variable is hidden and, as the potential of the facility improves, the values of the test statistics first become slightly higher than and then approach asymptotically a chi(2) distribution. The role of sign degeneracies is also discussed.

Place, publisher, year, edition, pages
2015. no 3, 005
Keyword [en]
Neutrino Physics, CP violation, Statistical Methods
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-163978DOI: 10.1007/JHEP03(2015)005ISI: 000351359600005OAI: diva2:809790
EU, FP7, Seventh Framework Programme, PCIG11-GA-2012-321582

QC 20150505

Available from: 2015-05-05 Created: 2015-04-13 Last updated: 2015-05-05Bibliographically approved

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Blennow, Mattias
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