Lepton masses and mixings in orbifold models with three Higgs families
نویسنده
چکیده
We analyse the phenomenological viability of heterotic Z3 orbifolds with two Wilson lines, which naturally predict three supersymmetric families of matter and Higgs fields. Given that these models can accommodate realistic scenarios for the quark sector avoiding potentially dangerous flavour-changing neutral currents, we now address the leptonic sector, finding that viable orbifold configurations can in principle be obtained. In particular, it is possible to accomodate present data on charged lepton masses, while avoiding conflict with lepton flavour-violating decays. Concerning the generation of neutrino masses and mixings, we find that Z3 orbifolds offer several interesting possibilities.
منابع مشابه
Fermion masses and mixings from heterotic orbifold models
We search for a possibility of getting realistic fermion mass ratios and mixing angles from renormalizable couplings on the Z6–I heterotic orbifold with one pair of Higgs doublets. In the quark sector, we find cases with reasonable mc/mt , ms/mb, and Vcb, if we ignore the first family. In the lepton sector, we can fit the charged lepton mass ratios, the neutrino mass squared difference ratio, a...
متن کاملQuarks and Leptons between Branes and Bulk
We study a supersymmetric SO(10) gauge theory in six dimensions compactified on an orbifold. Three sequential quark-lepton families are localized at the three fixpoints where SO(10) is broken to its three GUT subgroups. Split bulk multiplets yield the Higgs doublets of the standard model and as additional states lepton doublets and down-quark singlets. The physical quarks and leptons are mixtur...
متن کاملThe Flavour Puzzle from an Orbifold GUT Perspective
Neutrino masses and mixings are very different from quark masses and mixings. This puzzle is a crucial hint in the search for the mechanism which determines fermion masses in grand unified theories. We study the flavour problem in an SO(10) GUT model in six dimensions compactified on an orbifold. Three sequential families are localized at three branes where SO(10) is broken to its three GUT sub...
متن کاملQuasi-Degenerate Neutrinos and Lepton Flavor Violation in Supersymmetric Models
In supersymmetric (SUSY) models the misalignment between fermion and sfermion families introduces unsuppressed flavor-changing processes. Even if the mass parameters are chosen to give no flavor violation, family dependent radiative corrections make this adjustment not stable. We analyze the rate of l → lγ in SUSY-GUT models with three quasi-degenerate neutrinos and universal scalar masses at t...
متن کاملFive Adjustable Parameter Fit of Quark and Lepton Masses and Mixings
We develop a model of ours fitting the quark and lepton masses and mixing angles by removing from the model a Higgs field previously introduced to organise a large atmospheric mixing angle for neutrino oscillations. Due to the off-diagonal elements dominating in the see-saw neutrino mass matrix the large atmospheric mixing angle comes essentially by itself. It turns out that we have now only fi...
متن کامل