Non-standard interactions versus non-unitary lepton flavor mixing at a neutrino factory
2010 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 2010, no 04, 041- p.Article in journal (Refereed) Published
The impact of heavy mediators on neutrino oscillations is typically described by non-standard four-fermion interactions (NSIs) or non-unitarity (NU). We focus on leptonic dimension-six effective operators which do not produce charged lepton flavor violation. These operators lead to particular correlations among neutrino production, propagation, and detection non-standard effects. We point out that these NSIs and NU phenomenologically lead, in fact, to very similar effects for a neutrino factory, for completely different fundamental reasons. We discuss how the parameters and probabilities are related in this case, and compare the sensitivities. We demonstrate that the NSIs and NU can, in principle, be distinguished for large enough effects at the example of non-standard effects in the mu-tau-sector, which basically corresponds to differentiating between scalars and fermions as heavy mediators as leading order effect. However, we find that a near detector at superbeams could provide very synergistic information, since the correlation between source and matter NSIs is broken for hadronic neutrino production, while NU is a fundamental effect present at any experiment.
Place, publisher, year, edition, pages
Springer-Verlag , 2010. Vol. 2010, no 04, 041- p.
Beyond Standard Model, Neutrino Physics, CP violation
IdentifiersURN: urn:nbn:se:kth:diva-27904DOI: 10.1007/JHEP04(2010)041ISI: 000277473100029ScopusID: 2-s2.0-77954923560OAI: oai:DiVA.org:kth-27904DiVA: diva2:383049
FunderSwedish Research Council, 621-2008-4210EU, FP7, Seventh Framework Programme, 212372
QC 201101042011-06-212011-01-032011-06-21Bibliographically approved