Flavour physics from an approximate U(2)3 symmetry
By R. Barbieri, D. Buttazzo, F. Sala, David M. Straub. 2012
218 citations recorded by the source corpus.
A bstractThe quark sector of the Standard Model exhibits an approximate U(2)3 flavour symmetry. This symmetry, broken in specific directions dictated by minimality, can explain the success of the Cabibbo-Kobayashi-Maskawa picture of flavour mixing and CP violation, confirmed by the data so far, while allowing for observable deviations from it, as expected in most models of ElectroWeak Symmetry Breaking. Building on previous work in the specific context of supersymmetry, we analyze the expected effects and we quantify the current bounds in a general Effective Field Theory framework. As a further relevant example we then show how the U(2)3 symmetry and its breaking can be implemented in a generic composite Higgs model and we make a first analysis of its peculiar consequences. We also discuss how some partial extension of U(2)3 to the lepton sector can arise, both in general and in composite Higgs models. An optimistic though conceivable interpretation of the considerations developed in this paper gives reasons to think that new physics searches in the flavour sector may be about to explore an interesting realm of phenomena.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5215466f61d12282c089f665ef0ab18b9560d2c4
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In Nuclear and High Energy Physics
Citations in the corpus
- B-physics anomalies: a guide to combined explanations (2017, methodology): “Motivated by the observed pattern of the quark Yukawa couplings (both mass eigenvalues and mixing matrix), it is further assumed that the leading breaking terms of this flavour symmetry are two spurion doublets, Vq and V`, that give rise to the mixing between the third generation and the other two [”
- Twin Higgs mechanism and a composite Higgs boson (2015, background): “This seems particularly motivated in the case of the charm, as one can then realize a U(2)(3) flavor symmetry [36, 37].”
- On the validity of the effective field theory for dark matter searches at the LHC part III: analysis for the t-channel (2013, background): “For example, if the effective operators come from a Naturalness-motivated new physics theory like Supersymmetry or Composite Higgs Models, assuming a U(2)(3) flavour symmetry [36, 37] the normalization would be”