Results 1 to 10 of about 925 (299)

Modular flavour symmetry and orbifolds [PDF]

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   +4 more sources

Accidental Peccei–Quinn symmetry from discrete flavour symmetry and Pati–Salam

Physics Letters B, 2018
We show how an accidental U(1) Peccei–Quinn (PQ) symmetry can arise from a discrete A4 family symmetry combined with a discrete flavour symmetry Z3×Z52, in a realistic Pati–Salam unified theory of flavour. Imposing only these discrete flavour symmetries,
Fredrik Björkeroth, Eung Jin Chun, Stephen F. King   +2 more
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6d SCFTs and U(1) flavour symmetries [PDF]

Journal of High Energy Physics, 2018
We study the behaviour of abelian gauge symmetries in six-dimensional N = (1,0) theories upon decoupling gravity and investigate abelian flavour symmetries in the context of 6d N = (1, 0) SCFTs.
Seung-Joo Lee, Diego Regalado, Timo Weigand   +2 more
doaj   +4 more sources

Charged lepton flavour violation from inverse seesaw with flavour and CP symmetries [PDF]

Nuclear Physics B
We study charged lepton flavour violation in a scenario in which light neutrino masses are generated via the inverse seesaw mechanism with 3+3 gauge singlet fermions, Ni and Sj, i,j=1,2,3.
F.P. Di Meglio, C. Hagedorn
doaj   +2 more sources

Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

European Physical Journal C: Particles and Fields, 2021
The confirmation of the discrepancy with the Standard Model predictions in the anomalous magnetic moment by the Muon g-2 experiment at Fermilab points to a low scale of new physics.
Lorenzo Calibbi, M. L. López-Ibáñez, Aurora Melis, Oscar Vives   +3 more
doaj   +1 more source

Flavour bounds on the flavon of a minimal and a non-minimal $${\mathcal {Z}}_2 \times {\mathcal {Z}}_N$$ Z 2 × Z N symmetry

European Physical Journal C: Particles and Fields, 2023
We investigate flavour bounds on the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 and $${\mathcal {Z}}_2 \times {\mathcal {Z}}_9$$ Z 2 × Z 9 flavour symmetries.
Gauhar Abbas, Vartika Singh, Neelam Singh, Ria Sain   +3 more
doaj   +1 more source

Two A4 modular symmetries for Tri-Maximal 2 mixing

Nuclear Physics B, 2022
We construct a lepton flavour model based on two A4 modular symmetries. The two A4 are broken by a bi-triplet field to the diagonal A4 subgroup, resulting in an effective modular A4 flavour symmetry with two moduli. We employ these moduli as stabilisers,
Ivo de Medeiros Varzielas, João Lourenço   +1 more
doaj   +1 more source

FCNC-free multi-Higgs-doublet models from broken family symmetries

Physics Letters B, 2020
We demonstrate how residual flavour symmetries, infrared signatures of symmetry breaking in complete models of flavour, can naturally forbid (or limit in a flavour specific way) flavour-changing neutral currents (FCNC) in multi-Higgs-doublet models (MHDM)
Ivo de Medeiros Varzielas, Jim Talbert
doaj   +1 more source

Littlest modular seesaw

Journal of High Energy Physics, 2023
We present the first complete model of the Littlest Modular Seesaw, based on two right-handed neutrinos, within the framework of multiple modular symmetries, justifying the use of multiple moduli fields which take their values at 3 specific stabilizers ...
Ivo de Medeiros Varzielas, Steve F. King, Miguel Levy   +2 more
doaj   +1 more source

Two A5 modular symmetries for Golden Ratio 2 mixing

Nuclear Physics B, 2022
We present a model of leptonic mixing based on two A5 modular symmetries using the Weinberg operator. The two modular symmetries are broken to the respective diagonal A5 subgroup.
Ivo de Medeiros Varzielas, João Lourenço   +1 more
doaj   +1 more source