arXiv subjects

O. Felix-Beltran

Publications and source records attributed to O. Felix-Beltran.

6 recordsLinked to original sources

arXiv2026

Systematic analysis of fermionic masses and flavor mixings: a model-independent approach

In a model-independent context, we perform a systematic and detailed study of the fermion flavor masses and mixings. In this analysis, we present a most general parameterization form of the $3 \times 3$ mass matrix, as well as the Pontecorvo-Maki-Nakagawa-Sakata flavor mixing matrix, in terms of the fermionic masses and some free parameters. A likelihood test using the $χ^2$ statistic is implemented to evaluate whether the theoretical expressions for the leptonic flavor mixing angles also reproduce the experimental data. The results of the $χ^2$ fit show that the theoretical expressions obtained for the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix correctly reproduce the actual experimental data on neutrino oscillations.

hep-ph↗

arXiv2017

Linking LFV Higgs decays $h\to \ell_i \ell_j$ with CP violation in multi-scalar models

The study of LFV decays of the Higgs boson, $h\to \ell_i \ell_j$, has become an active research subject both from the experimental and theoretical points of view. Such decays vanish within the SM and are highly suppressed in several theoretical extensions. Due to its relevance and relative simplicity to reconstruct the signal at future colliders, it is an important tool to probe SM extensions where it could reach detectable levels. Here we identify a mechanism that induces LFV Higgs interactions, by linking it with the appearance of CP violation in the scalar sector, within the context of general multi-Higgs models. We then focus on the simplest model of this type to study its phenomenology. The scalar sector of this minimal model consisting of a Higgs doublet and a Froggatt--Nielsen (FN) (complex) singlet is studied thoroughly, including the scalar spectrum and the Yukawa interactions. Constraints on the parameters of the model are derived from low-energy observables and LHC Higgs data, which is then applied to study the resulting predicted rates for the decay $h\rightarrow τμ$. Overall, branching ratios for $h \rightarrow τμ$ of the order $10^{-3}$ are obtained within this approach consistent with all known constraints.

hep-ph↗

arXiv2014

Flavor Physics constrains on a $\mathbb{Z}_5$-3HDM

We present the general behavior of the scalar sector in a Three Higgs Doublet Model (3HDM) with a $\mathbb{Z}_5$ flavor symmetry. There are regions of the parameters space where it is possible to get a SM-like Higgs boson with the other Higgs bosons being heavier, thus decoupled from the SM, and without relevant contributions to any flavor observables. There are however other more interesting regions of parameter space with a light charged Higgs ($m_{H^\pm} \sim $ 150 GeV) that are consistent with experimental results and whose phenomenological consequences could be interesting. We present a numerical analysis of the main $B$-physics constraints and show that the model can correctly describe the current experimental data.

hep-ph↗

arXiv2011

Implications of Yukawa texture in the charged Higgs boson phenomenology within 2HDM-III

We discuss the implications of assuming a four-zero Yukawa texture for the properties of the charged Higgs boson within the context of the general 2-Higgs Doublet Model of Type III. We present the charged Higgs boson couplings with heavy quarks and the resulting pattern for its decays, including the decay $H^+ \to W^+ γ$ at 1-loop level. The parameters chosen can still avoid the $B \to X_s γ$ constraint, the perturbativity and $ρ_0$ bound. Also, we present the constraints of $ B0-\bar{B}0$ mixing and of the radiative corrections to the $Z b \bar{b}$ vertex in the regime small $ \tan β$. The production of charged Higgs bosons is also sensitive to the modifications of its couplings, so that we also evaluate the resulting effects on `direct' $c\bar{b}\to H^++c. c.$ and `indirect' $q\bar q,gg\to \bar t b H^++c. c.$ production. Significant scope exists at the Large Hadron Collider for several $H^\pm$ production and decay channels combined to enable one to distinguish between such a model and alternative 2-Higgs doublet scenarios.

hep-ph↗

arXiv2010

A Numerical Analysis of the Supersymmetric Flavor Problem and Radiative Fermion Masses

We study the SUSY flavor problem in the MSSM, we are namely interested in estimating the size of the SUSY flavor problem and its dependence on the MSSM parameters. For that, we made a numerical analysis randomly generating the entries of the sfermion mass matrices and then determinated which percentage of the points are consistent with current bounds on the flavor violating transitions on lepton flavor violating (LFV) decays $l_i \to l_j γ$. We applied two methods, mass-insertion approximation method (MIAM) and full diagonalization method (FDM). Furthermore, we determined which fermion masses could be radiatively generated (through gaugino-sfermion loops) in a natural way, using those random sfermion matrices. In general, the electron mass generation can be done with 30% of points for large $\tanβ$, in both schemes the muon mass can be generated by 40% of points only when the most precise sfermion splitting (from the FDM) is taken into account.

hep-ph↗

arXiv2003

Probing the charged Higgs quantum numbers through the decay H^+ -> W^+ h^0

The vertex H^+_αW^-h^0_β, involving the gauge boson W^+- and the charged (H^+-_α) and neutral Higgs bosons (h^0_β), arises within the context of many extensions of the SM, and it can be used to probe the quantum numbers of the Higgs multiplet. After presenting a general discusion for the expected form of this vertex with arbitrary Higgs representations, we discuss its strength for several specific models, which include: i) the Two-Higgs Doublet Model (THDM), both the generic and the SUSY case, and ii) models with additional Higgs triplets, including both SUSY and non-SUSY cases. We find that in these models, there are regions of parameters where the decay H^+_α-> W^+ h^0_β, is kinematically allowed, and reaches Branching Ratios (BR) that may be detectable, thus allowing to test the properties of the Higgs sector.

hep-ph↗