Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Flavourphysik 2 (Theorie)

T 57.7: Talk

Tuesday, March 10, 2015, 18:15–18:30, K.12.16 (K4)

Constraining Astrophysical Neutrino Flavor Composition from Leptonic Unitarity — •Xun-Jie Xu^1,2, Hong-Jian He², and Werner Rodejohann¹ — ¹Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany — ²Institute of Modern Physics and Center for High Energy Physics,Tsinghua University, Beijing 100084, China.

In this work, using the unitarity of leptonic mixing matrix, we derive nontrivial unitarity constraints on the flavor composition of astrophysical neutrinos detected by IceCube. Applying leptonic unitarity triangles, we deduce these unitarity bounds from geometrical conditions, such as triangular inequalities. These new bounds generally hold for three flavor neutrinos, and are independent of any experimental input or the pattern of leptonic mixing. We apply our unitarity bounds to derive general constraints on the flavor compositions for three types of astrophysical neutrino sources (and their general mixture), and compare them with the IceCube measurements.