Conveners
Discrete symmetries and models of flavour mixing
- Christoph Schwanda (Austrian Academy of Sciences)
Discrete symmetries and models of flavour mixing
- Christoph Schwanda (Austrian Academy of Sciences)
Discrete symmetries and models of flavour mixing
- Margarida Nesbitt Rebelo (Instituto Superior Tecnico (IST))
- Margarida Nesbitt Rebelo Da Silva (Universidade de Lisboa (PT))
We study a model with an extended Higgs sector and an underlying S3 flavour symmetry. We explore the phenomenological consequences this symmetry has by studying simultaneously the quark, Higgs and neutrino sectors, including one-loop corrections to the Higgs potential. We also present the results for leptogenesis and the associated baryogenesis in the model.
We attempt to find a discrete, non-abelian flavour symmetry which could explain masses and mixing matrix elements of leptons beyond the Standard Model. In our preposition in comparison to the Standard Model there is no need to break flavour symmetry.
With the GAP program, we investigate all finite subgroups of the U(3) group, up to the order of 1025. For the two-Higgs-doublet models we show...
We study models of lepton masses and mixing based on broken modular invariance. We consider invariance under the finite modular group $\Gamma_4 \simeq S_4$ and focus on the minimal scenario where the expectation value of the modulus is the only source of symmetry breaking, such that no flavons need to be introduced. After constructing a basis for the lowest weight modular forms, we build two...
I introduce generally applicable strategies for the construction of basis invariants in multi-Higgs models. Applied to the two Higgs doublet model (2HDM), this allows us to find the full set of generating (CP-even and CP-odd) basis invariants. The complete ring of basis invariants is constructed, and novel relations between the CP-odd basis invariants emerge. This allows to derive the basis...
The models with the gauge group $SU(3)_c\times SU(3)_L\times U(1)_X$ (331-models) have been advocated to explain why there are three fermion generations in Nature. As such they provide partial understanding of the flavour sector. The hierarchy of fermion masses in the Standard Model is another puzzle which remains without compelling explanation. In this talk I present a model that incorporates...
We propose a Grand Unifi?ed Theory of Flavour, based on SO(10) together with a non-Abelian discrete group S4, under which the unifi?ed three quark and lepton 16-plets are unifi?ed into a singlet triplet 3'. The Yukawa matrices are derived from the CSD2 flavon vacuum alignment and neutrino masses emerge from the type-I seesaaw mechanism. A full numerical ?fit is performed with 15 input...
In the 2HDM there are various types of CP-symmetries. These symmetries affect the masses and couplings of the model. Such physical implications (exact constraints on masses and couplings) are presented for a CP-conserving 2HDM (potential+vacuum), for a CP-conserving 2HDM-potential (but not vacuum), and for the various degrees of CP-symmetry of the 2HDM-potential (CP1/CP2/CP3).
We have calculated the W-loop contribution to the amplitude of the decay H → Z + γ in the Rξ gauge using dimensional regularization (DimReg) and in the unitary gauge through the dispersion with DimReg and the dispersion method, adopting the boundary condition at the limit MW → 0 defined by the Goldstone boson equivalence theorem (GBET), completely coincide. This implies that DimReg is...
The decay K+→π+νν, with a very precisely predicted branching ratio of less than 10-10, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+→π+νν with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and another year run is...
