Nov 9 – 10, 2020
Europe/Zurich timezone

Pinning down the Flavour Structure of Hidden Photons

Nov 9, 2020, 7:25 PM
10m

Speaker

Patrick Foldenauer

Description

Extensions of the Standard Model with an abelian gauge group are constrained by gauge anomaly cancellation, fermion masses and mixing angles. These constraints only allow for a limited number of $U(1)_X$ groups. We categorise these extensions and determine the allowed textures of Yukawa and Majorana mass matrices. If neutrinos are Dirac, the only possible choice satisfying all conditions is the $U(1)_{B-L}$ group, whereas all other $U(1)_X$ extensions require Majorana masses. This generically results in flavour changing couplings of the $X$ gauge boson to neutrinos. In the future, FASER$\nu$ 2 could play a crucial role in constraining these groups from searching for deviations of the flavour composition of the incoming neutrino flux from the SM prediction.

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