Results 11 to 20 of about 364 (120)
Symmetry constrained two Higgs doublet models
European Physical Journal C: Particles and Fields, 2018 We study two-Higgs-doublet models (2HDM) where Abelian symmetries have been introduced, leading to a drastic reduction in the number of free parameters in the 2HDM.
João M. Alves +5 more
doaj +1 more source
Flavour symmetries in the SMEFT
Journal of High Energy Physics, 2020 We analyse how U(3)5 and U(2)5 flavour symmetries act on the Standard Model Effective Field Theory, providing an organising principle to classify the large number of dimension-six operators involving fermion fields. A detailed counting of such operators,
Darius A. Faroughy +3 more
doaj +1 more source
Generation of SU(3) sum rule for charmed baryon decay
Journal of High Energy Physics, 2022 Flavor SU(3) symmetry is a powerful tool to analyze charmed baryon decays. In this work, we propose an approach to generate SU(3) sum rules for the singly and doubly charmed baryon decays without writing the Wigner-Eckhart invariants explicitly. The SU(3)
Di Wang
doaj +1 more source
Simplified models of flavourful leptoquarks
European Physical Journal C: Particles and Fields, 2019 We study the implications of single leptoquark extensions of the Standard Model (SM) under the assumption that their enhanced Yukawa sectors are invariant under global Abelian flavour symmetries already present in SM mass terms.
Ivo de Medeiros Varzielas, Jim Talbert
doaj +1 more source
Modular flavour symmetries and modulus stabilisation
Journal of High Energy Physics, 2022 We study the problem of modulus stabilisation in the framework of the modular symmetry approach to the flavour problem. By analysing simple UV-motivated CP-invariant potentials for the modulus τ we find that a class of these potentials has (non-fine ...
P. P. Novichkov +2 more
doaj +1 more source
Modular flavour symmetry and orbifolds
Journal of High Energy Physics, 2023 We develop a bottom-up approach to flavour models which combine modular symmetry with orbifold constructions. We first consider a 6d orbifold 𝕋2 /ℤ N , with a single torus defined by one complex coordinate z and a single modulus field τ, playing the role
Francisco J. de Anda, Stephen F. King
doaj +1 more source
Flavor structures of quarks and leptons from flipped SU(5) GUT with A 4 modular flavor symmetry
Journal of High Energy Physics, 2023 We propose to generate the flavor structures of the Standard Model plus neutrinos from flipped SU(5) GUT with A 4 modular flavor symmetry. Possible way to assign different moduli values for quarks and leptons in modular GUT scheme is discussed.
Xiao Kang Du, Fei Wang
doaj +1 more source
Finite family groups for fermionic and leptoquark mixing patterns
Journal of High Energy Physics, 2020 We employ a bottom-up and model-independent technique to search for non-Abelian discrete flavour symmetries capable of predicting viable CKM and PMNS matrices alongside of special patterns of leptoquark couplings.
Jordan Bernigaud +2 more
doaj +1 more source
Flavourful SMEFT likelihood for Higgs and electroweak data
Journal of High Energy Physics, 2020 We perform an updated fit to LHC Higgs data and LEP electroweak precision tests in the framework of the Standard Model Effective Field Theory (SMEFT). We assume a generic structure of the SMEFT operators without imposing any flavour symmetries.
Adam Falkowski, David Straub
doaj +1 more source
Leading directions in the SMEFT
Journal of High Energy Physics, 2023 Short-distance new physics at (or slightly) above the TeV scale should not excessively violate the approximate flavor symmetries of the SM in order to comply with stringent constraints from flavor-changing neutral currents.
Admir Greljo, Ajdin Palavrić
doaj +1 more source