Results 1 to 10 of about 2,383 (299)
Minimal complete tri-hypercharge theories of flavour [PDF]
Journal of High Energy PhysicsThe tri-hypercharge proposal introduces a separate gauged weak hypercharge assigned to each fermion family as the origin of flavour. This is arguably one of the simplest setups for building “gauge non-universal theories of flavour” or “flavour ...
Mario Fernández Navarro +2 more
doaj +7 more sources
Effective Theories for Quark Flavour Physics [PDF]
, 2020 Abstract The purpose of the lectures that appear within this chapter is to provide the reader with an idea of how we can probe new physics with quark flavour observables using effective theory techniques. It begins by providing a concise review of the quark flavour structure of the standard model.
Luca Silvestrini, Silvestrini, Luca
exaly +5 more sources
Minimal flavour deconstruction [PDF]
Journal of High Energy PhysicsWe construct two concrete examples of flavour non-universal gauge theories which, after the inclusion of all d ≤ 4 gauge invariant operators, allow to describe the observed pattern of flavour in the charged fermion sector without any small Yukawa ...
Riccardo Barbieri, Gino Isidori
doaj +4 more sources
On the normalisation of the modular forms in modular invariant theories of flavour [PDF]
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy PhysicsThe problem of normalisation of the modular forms in modular invariant lepton and quark flavour models is discussed. Modular invariant normalisations of the modular forms are proposed.
S T Petcov
exaly +6 more sources
Lepton flavour violation in supergravity theories [PDF]
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1989 Abstract The lepton flavour violating processes μ →e γ , μ →ee + e − and ( μ , e) conversion in the presence of nuclei are discussed in supergravity models. The dominant contribution arises from charged s-lepton mixing, if one goes beyond the tree level and includes renormalization effects.
J D Vergados, G K Leontaris
exaly +2 more sources
Flavour changes in locally supersymmetric theories
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1983 Abstract Locally supersymmetric models lead in general to flavour-changing gluino exchanges. We derive the necessary expressions for describing them in detail. We show that the K 0 K 0 mixing puts a lower bound on the gravitino mass and gives new restrictions on the Kobayashi-Maskawa angles.
H P Nilles, D Wyler
exaly +3 more sources
Journal of High Energy Physics, 2022 We study the flavor structure of the lepton and baryon number-conserving dimension-6 operators in the Standard Model effective field theory (SMEFT). Building on the work of [1], we define several well-motivated flavor symmetries and symmetry-breaking ...
Admir Greljo +2 more
doaj +1 more source
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 +2 more
doaj +1 more source
Fermion masses, critical behavior and universality
Journal of High Energy Physics, 2023 We look for signals of critical behavior in the Yukawa sector. By reviewing a set of models for the fermion masses, we select those where a symmetry-breaking order parameter sits at a transition point between a disordered phase and an ordered one.
Ferruccio Feruglio
doaj +1 more source
Plan B: new Z′ models for b → sℓ + ℓ − anomalies
Journal of High Energy Physics, 2023 Measurements of b → sμ + μ − transitions indicate that there may be a new physics field coupling to di-muon pairs associated with the b to s flavour transition.
Ben Allanach, Anna Mullin
doaj +1 more source