Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP04(2017)079
Keywords
Beyond Standard Model; CP violation; Heavy Quark Physics; Kaon Physics
Categories
Funding
- context of the ERC Advanced Grant project FLAVOUR [267104]
- DFG cluster of excellence Origin and Structure of the Universe
- Alexander von Humboldt Foundation
- DFG SFB/TR Symmetries and the Emergence of Structure in QCD
- context of the ERC Advanced Grant project FLAVOUR [267104]
- DFG cluster of excellence Origin and Structure of the Universe
- Alexander von Humboldt Foundation
- DFG SFB/TR Symmetries and the Emergence of Structure in QCD
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We study the patterns of flavour violation in renormalisable extensions of the Standard Model (SM) that contain vector -like quarks (VLQs) in a single complex representation of either the SM gauge group GSM or G'(SM) = G(SM) circle times U(1)(L mu) (- L tau). We first decouple VLQs in the M = (1 - 10) TeV range and then at the electroweak scale also Z, Z' gauge bosons and additional scalars to study the phenomenology. The results depend on the relative size of Z- and Z'-induced flavour -changing neutral currents, as well as the size of vertical bar Delta F vertical bar = 2 contributions including the effects of renormalisation group Yukawa evolution from M to the electroweak scale that turn out to be very important for models with right-handed currents through the generation of left -right operators. In addition to rare decays like P -> ll, P -> P'll P -> P'v (v) over bar with P = K, B-s, B-d and vertical bar Delta F vertical bar= 2 observables we analyze the ratio epsilon'/epsilon which appears in the SM to be significantly below the data. We study patterns and correlations between these observables which taken together should in the future allow for differentiating between VLQ models. In particular the patterns in models with left-handed and right-handed currents are markedly different from each other. Among the highlights are large Z -mediated new physics effects in Kaon observables in some of the models and significant effects in B-s,B-d-observables. epsilon'/epsilon can easily be made consistent with the data, implying then uniquely the suppression of K-L -> pi(O)v (v) over bar. Significant enhancements of Br(K+ -> pi(+) v (v) over bar) are still possible. We point out that the combination of NP effects to vertical bar Delta F vertical bar = 2 and vertical bar Delta F vertical bar = 1 observables in a given meson system generally allows to determine the masses of VLQs in a given representation independently of the size of VLQ couplings.
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