In this work, we have studied the vector scotogenic model in the context of the dark matter problem. Due to unitarity considerations, we have focused on the scenario with fermion dark matter, finding out that co-annihilations play a fundamental role in achieving dark matter relic abundance. Moreover, the coannihilation effects allow to separate the parameter space into two regions with different phenomenology. In addition, we have studied the detection prospects of these regions separately, focusing on signatures that can appear in lepton flavor violating decays, indirect and direct searches, and the production of these new particles at collider facilities.

Chile

Paulo Areyuna C

Jilberto Zamora-Saa

Alfonso Zerwekh

Fermion dark matter in the vector scotogenic model: a survey of signatures

The introduction of electroweak multiplets that transform under any representation of the standard SU(2) L  gauge group suggests the existence of electrically neutral stable particles capable of serving as cold dark matter in the ΛCDM cosmological model. This paradigm, known as minimal dark matter, has primarily focused on spin-0 and spin-1/2 particles. We extend this study to the spin-1 case using the 5-dimensional real representation. We address unitarity concerns arising from the model’s interactions with electroweak and Higgs fields of the Standard Model, investigating implications for dark matter relic density, direct and indirect detection, including non-perturbative Sommerfeld enhancement for the latter. Collider signatures of the proposed model are also examined. Our findings suggest that the model remains consistent with experimental constraints, particularly for dark matter masses on the order of dozens of TeV, and could potentially be tested using γ-ray observatories such as CTA.

Patricio Escalona

Sebastián Acevedo

Paulo Areyuna

Gonzalo Benítez-Irarrázabal

Pablo Solar

Vector dark matter from the 5-dimensional representation of SU(2) L

In order to explain the mass hierarchy and mixing pattern in the leptonic sector, we explore an extension of the Standard Model whose scalar sector includes one active and two inert doublets as well as some scalar singlets. The model includes a  $$S_3$$  <math> <msub> <mi>S</mi> <mn>3</mn> </msub> </math>   family symmetry supplemented by extra cyclic symmetries. As a consequence of our construction, a Dark Matter (DM) candidate is predicted and its properties are consistent with the observed cosmic abundances and the constraints imposed by direct and indirect detection experiments. The model allows Charged Lepton Flavor Violation (CLFV) processes like  $$\mu \rightarrow e\gamma $$  <math> <mrow> <mi>μ</mi> <mo>→</mo> <mi>e</mi> <mi>γ</mi> </mrow> </math>   and  $$\mu \rightarrow 3e$$  <math> <mrow> <mi>μ</mi> <mo>→</mo> <mn>3</mn> <mi>e</mi> </mrow> </math>  , but the predicted branching ratios align with experimental limits. Additionally, our analysis elucidates the generation of the active neutrino masses through a one-loop radiative seesaw mechanism matching the observed neutrino oscillation data. The model agrees with experimental data on Higgs Diphoton decay rates and on oblique parameters.

A. Hernández

Daniel Salinas-Arizmendi

Jonatan Vignatti

Phenomenology of an extended  $$1+2$$  <math> <mrow> <mn>1</mn> <mo>+</mo> <mn>2</mn> </mrow> </math>   Higgs doublet model with  $$S_3$$  <math> <msub> <mi>S</mi> <mn>3</mn> </msub> </math>   family symmetry

In this work, we explore an extension of the Standard Model designed to elucidate the fermion mass hierarchy, account for the dark matter relic abundance, and explain the observed matter-antimatter asymmetry in the universe. Beyond the Standard Model particle content, our model introduces additional scalars and fermions. Notably, the light active neutrinos and the first two generations of charged fermions acquire masses at the one-loop level. The model accommodates successful low-scale leptogenesis, permitting the mass of the decaying heavy right-handed neutrino to be as low as 10 TeV. We conduct a detailed analysis of the dark matter phenomenology and explore various interesting phenomenological implications. These include charged lepton flavor violation, muon and electron anomalous magnetic moments, constraints arising from electroweak precision observables, and implications for collider experiments.

Carolina Arbeláez

Claudio Dib

Patricio Contreras

Vishnudath K. N.

A common framework for fermion mass hierarchy, leptogenesis and dark matter

In this work, we consider an extension to the Standard Model composed by a Massive Vector Doublet under SU(2) L  and a Left-handed Heavy Neutral Lepton. We study the production of these exotic leptons with the Same Flavor Opposite Sign standard lepton pair, and jets, considering Drell-Yan and Vector Boson Fusion as independent cases. We find that for the latter, the dilepton angular distribution is different enough from the background to use it as a smoking-gun for our model. Based on this fact, we establish limits on the parameter space considering previous experimental searches in this final state.

C. Paulo Areyuna

Probing left-handed heavy neutral leptons in the Vector Scotogenic Model

The polynomial affine gravity is a model that is built up without the explicit use of a metric tensor field. In this article we reformulate the three-dimensional model and, given the decomposition of the affine connection, we analyse the consistently truncated sectors. Using the cosmological ansatz for the connection, we scan the cosmological solutions on the truncated sectors. We discuss the emergence of different kinds of metrics.

Oscar Castillo-Felisola

Oscar Orellana

José Perdiguero

Francisca Ramírez

Uruguay

Aureliano Skirzewski

Aspects of the polynomial affine model of gravity in three dimensions

We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar. In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations. Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied. We found three viable regions of the parameter space, and the model is sensitive to indirect searches.

Germany

Bastián Sáez

Sebastián Norero

Fermion singlet dark matter in a pseudoscalar dark matter portal

We have analysed the observable consequences of the interactions of spin-1 resonances coupled to the invariant fermionic currents that arise in an <math><mi>S</mi><mi>O</mi><mo>(</mo><mn>5</mn><mo>)</mo></math> Composite Higgs set-up. The phenomenology entailed by such interactions is thoroughly analysed by studying heavy vector resonances production and decay modes in the viable resonance mass range. Additionally, the production of double and single-composite fermion final states has been scanned along the fermion mass scale. Such production is mediated by the SM gauge and Higgs interactions, and also by charged and neutral vector resonances. The coupling between the new fermions and vector resonances induces a sizeable effect in the production rates. We use the recent 13 TeV LHC searches for vector-like quarks to constrain our parameter space. Specifically, we explore the allowed regions by analysing the decays of a heavy vector-like quark in the Wb-channel. We conclude that generically the impact of the couplings between the spin-1 and spin-1/2 resonances will substantially reduce the permitted regions, leading us to test the sensitivity of the parametric dependence in the light of exotic matter interactions.

Juan Yepes

Modelling top partner-vector resonance phenomenology

In this paper the compatibility is analyzed of the non-perturbative equations of state of quarks and gluons arising from the lattice with some natural requirements for self-gravitating objects at equilibrium: the existence of an equation of state (namely, the possibility to define the pressure as a function of the energy density), the absence of superluminal propagation and Le Chatelierâs principle. It is discussed under which conditions it is possible to extract an equation of state (in the above sense) from the non-perturbative propagators arising from the fits of the latest lattice data. In the quark case, there is a small but non-vanishing range of temperatures in which it is not possible to define a single-valued functional relation between density and pressure. Interestingly enough, a small change of the parameters appearing in the fit of the lattice quark propagator (of around 10Â %) could guarantee the fulfillment of all the three conditions (keeping alive, at the same time, the violation of positivity of the spectral representation, which is the expected signal of confinement). As far as gluons are concerned, the analysis shows very similar results. Whether or not the non-perturbative quark and gluon propagators satisfy these conditions can have a strong impact on the estimate of the maximal mass of quark stars.

Fabrizio Canfora

Alex Giacomini

Belgium

Pablo Pais

Italy

Luigi Rosa

Comments on the compatibility of thermodynamic equilibrium conditions with lattice propagators