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Gherghetta, Tony; Kersten, Jörn; Olive, Keith; Pospelov, Maxim
Physical review. D, 11/2019, Volume: 100, Issue: 9Journal Article
We consider both "bottom-up" and "top-down" approaches to the origin of gauge kinetic mixing. We focus on the possibilities for obtaining kinetic mixings ε which are consistent with experimental constraints and are much smaller than the naive estimates ( ε ∼ 10−2 – 10−1) at the one-loop level. In the bottom-up approach, we consider the possible suppression from multiloop processes. Indeed we argue that kinetic mixing through gravity alone, requires at least six loops and could be as large as ∼ 10−13. In the top-down approach we consider embedding the Standard Model and a U (1)X in a single grand-unified gauge group as well as the mixing between Abelian and non-Abelian gauge sectors.
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