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T: Fachverband Teilchenphysik

T 41: Neutrinophysik (Theorie)

T 41.5: Vortrag

Montag, 24. März 2014, 17:45–18:00, P108

Precision tests of unitarity in leptonic mixing — •Lorenzo Basso^1,2, Oliver Fischer², and Jochum J. van der Bij² — ¹IPHC Strasbourg — ²Albert-Ludwigs-Universität Freiburg

In the light of the recent LHC data, we study precision tests sensitive to the violation of lepton universality, in particular the violation of unitarity in neutrino mixing. Keeping all data we find no satisfactory fit, even allowing for violations of unitarity in neutrino mixing. Leaving out sin² θ_eff, from the hadronic forward-backward asymmetry at LEP, we find a good fit to the data with some evidence of lepton universality violation at the O(10⁻³) level. An improvement by a factor two in the measurement of the W-boson mass and of sin² θ_eff would be sufficient to claim a discovery.