CPT Student Seminar: Unitarity and the Three Flavour Neutrino Mixing Matrix
19 October 2015 17:00 in OC218
Unitarity is a fundamental property of any theory required to ensure we work in a theoretically consistent framework. In comparison with the quark sector, experimental tests of unitarity for the 3x3 neutrino mixing matrix are considerably weaker. It must be remembered that the vast majority of our information on the neutrino mixing angles originates from electron and tau neutrino disappearance experiments, with the assumption of unitarity being invoked to constrain the remaining elements. New physics can invalidate this assumption for the 3x3 subset and thus modify our precision measurements. I will discuss where such non-unitarity can originate from and give results on a reanalysis to see how global knowledge is altered when one refits oscillation results without assuming unitarity. There is significant room for new low energy physics, especially in the tau neutrino sector which very few current experiments constrain directly.
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A gathering of mathematicians from the CPT group with physicists from IPPP, we meet to discuss our work in a relaxed and friendly environment.
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