MOCa 2022: Materia Oscura en Colombia
from
Tuesday, May 31, 2022 (3:00 AM)
to
Wednesday, June 1, 2022 (5:30 PM)
Monday, May 30, 2022
Tuesday, May 31, 2022
8:45 AM
8:45 AM  9:00 AM
9:00 AM
Complementarity of experiments in probing the nonrelativistic effective theory of dark matternucleon interactions

Anja Brenner
Complementarity of experiments in probing the nonrelativistic effective theory of dark matternucleon interactions
Anja Brenner
9:00 AM  9:45 AM
The nonrelativistic effective theory of WIMPnucleon interactions depends on 28 coupling strengths. Due to the vast parameter space of the effective theory, most direct detection experiments interpret the results of their searches assuming that only one of the coupling strengths is nonzero. On the other hand, dark matter models generically lead in the nonrelativistic limit to several interactions which interfere with one another, therefore, the published limits cannot be straightforwardly applied to model predictions. We present a method to determine a rigorous upper limit on the WIMPnucleon interaction strength including all possible interferences among operators. We illustrate the method using the null search results from the XENON1T and the PICO collaborations; for some interactions, the limits on the coupling strengths are relaxed up to one order of magnitude. We also present a method that allows to combine the results from different experiments, thus exploiting the synergy between different targets in exploring the parameter space of WIMPnucleon interactions.
9:45 AM
Fermion and scalar twocomponent dark matter from a Z4 symmetry

Carlos E. Yaguna
Fermion and scalar twocomponent dark matter from a Z4 symmetry
Carlos E. Yaguna
9:45 AM  10:30 AM
We study a twocomponent dark matter model in which the dark matter particles are a singlet fermion (ψ) and a singlet scalar (S), both stabilized by a single Z4 symmetry. The model is remarkably simple, with its phenomenology determined by just five parameters: the two dark matter masses and three dimensionless couplings. In fact, S interacts with the Standard Model particles via the usual Higgsportal, whereas ψ only interacts directly with S, via the Yukawa terms ψc(ys + ypγ5)ψ S. We consider the two possible mass hierarchies among the dark matter particles, MS < Mψ and Mψ < MS , and numerically investigate the consistency of the model with current bounds. For dark matter masses below 1.3 TeV or so, we find that the model not only is compatible with all known constraints, but that it also gives rise to observable signals in future dark matter experiments. Interestingly, both dark matter particles may be observed in direct detection experiments while the most relevant indirect detection channel is due to the annihilation of ψ. We also argue that this setup can be extended to other ZN symmetries and additional dark matter particles.
10:30 AM
Coffee Break
Coffee Break
10:30 AM  10:50 AM
10:50 AM
Multicomponent dark matter: recent developments
Multicomponent dark matter: recent developments
10:50 AM  11:20 AM
In this talk I will discuss some recent developments concerning scenarios of multicomponent dark matter based on a single ZN symmetry.
11:20 AM
Scalar potential analysis of the Z5 multicomponent dark matter model

Diego Ríos
(
Universidad de Antioquia
)
Scalar potential analysis of the Z5 multicomponent dark matter model
Diego Ríos
(
Universidad de Antioquia
)
11:20 AM  11:50 AM
In recent years the multicomponent scalar dark matter models with discrete symmetries $\mathbb{Z}_N$ has been widely studied in the literature. Among them, the $\mathbb{Z}_5$ model proposes two complex fields that transform as singlets under the gauge group of Standard Model. The model has eleven free parameters that must be restricted. In that sense, the main purpose of this research is to develop an detailed analysis of the scalar potential with the objective to establish the perturbative unitarity, vacuum stability and positivity conditions, and finally to determine the viable parameter space of the model.
12:00 PM
Lunch
Lunch
12:00 PM  2:00 PM
2:00 PM
Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson

Bibiana Marcela Marín Ochoa
Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson
Bibiana Marcela Marín Ochoa
2:00 PM  2:45 PM
The $\ell_i\to\ell_j\chi$ decays, with $\chi$ a boson associated to the $U(1)_\chi$ symmetry, have not been described satisfactorily so far for light spinone $\chi$. In particular, observables exhibited an unphysical divergence in the limit of massless $\chi$, associated with its longitudinal polarizations. Based on gauge symmetry, we show how to correct this issue. To this end, we consider two general models realizing the effective field theory description. Being the LFV is generated either at tree level or at one loop, these processes are well behaved for light $m_\chi$. We discuss the most salient phenomenological consequences and its relevance in the searches for this kind of decays.
2:45 PM
Dark matter from dark photon signal classification at DUNE near detector with machine learning

Guillermo Palacio
Dark matter from dark photon signal classification at DUNE near detector with machine learning
Guillermo Palacio
2:45 PM  3:30 PM
We study a scalar dark matter (DM) model with two DM species coupled to the Standard Model (SM) particles via a subGeV dark photon. The two DM candidates can be produced at fixedtarget experiments a la Beam Dump. We used machine learning techniques to distinguish signal from background and explored the potential reach in the sensitivity of DUNE near detector.
3:30 PM
Effective Dirac Neutrino Mass Operator in the Standard Model With a Local Abelian Extension

DAVID ALEJANDRO SUAREZ ROLDAN
Effective Dirac Neutrino Mass Operator in the Standard Model With a Local Abelian Extension
DAVID ALEJANDRO SUAREZ ROLDAN
3:30 PM  4:00 PM
We present 48 types of solutions to the anomaly cancellation conditions of local Abelian extensions of the Standard Model (SM) with righthanded SMsinglet chiral fermions. At least two of them acquire effective light Dirac neutrino masses, while the others get heavy masses from the spontaneous symmetry breaking of the local Abelian symmetry, forming a dark sector with multicomponent and multigenerational fermionic dark matter. The corresponding effective Dirac neutrino mass operator can be realized at treelevel or radiatively by introducing extra scalars, and in some cases after imposing extra scotogenic conditions.The Dirac Zee model with Dirac fermionic dark matter is presented as an example of model where the neutrino and dark matter phenomenology are basically independent of each other.
4:00 PM
Coffee Break
Coffee Break
4:00 PM  4:30 PM
4:30 PM
Discussion
Discussion
4:30 PM  5:30 PM
Wednesday, June 1, 2022
9:00 AM
Gauged Baryon or Lepton number

DIEGO ALEJANDRO RESTREPO QUINTERO
Gauged Baryon or Lepton number
DIEGO ALEJANDRO RESTREPO QUINTERO
9:00 AM  9:45 AM
9:45 AM
A dark matter connection in a flavored axion model

Eduardo Rojas
A dark matter connection in a flavored axion model
Eduardo Rojas
9:45 AM  10:30 AM
A PecceiQuinn (PQ) symmetry is proposed, in order to generate in the Standard Model (SM) quark sector a realistic mass matrix ansatz with five texturezeros. Limiting our analysis to Hermitian mass matrices we show that this requires a minimum of 4 Higgs doublets. This model allows assigning values close to 1 for several Yukawa couplings, giving insight into the origin of the mass scales in the SM. Since the PQ charges are nonuniversal the model features FlavorChanging Neutral Currents (FCNC) at the tree level. In the model We found a pseudoscalar NambuGoldstone which could be a dark matter candidate.
10:30 AM
Coffee Break
Coffee Break
10:30 AM  10:50 AM
10:50 AM
Dark Matter in the Time of Primordial Black Holes

Nicolás Bernal
(
Universidad Antonio Nariño
)
Dark Matter in the Time of Primordial Black Holes
Nicolás Bernal
(
Universidad Antonio Nariño
)
10:50 AM  11:20 AM
Hawking evaporation of primordial black holes (PBH) with masses ranging from $\sim 10^{1}$ to $\sim 10^9$ g can generate the whole observed dark matter (DM) relic density. However, a second DM production mechanism, like freezeout or freezein, could have also been active in the early universe. Here we study the interplay of these mechanisms, focusing on the scenario where PBHs dominate the energy density of the universe, leading to a nonstandard cosmological era.
11:20 AM
Observational signatures of compact dark stars

Alejandro Ibarra
Observational signatures of compact dark stars
Alejandro Ibarra
11:20 AM  11:50 AM
If the dark matter particle has selfinteractions, it is generically expected that a fraction of the dark matter of the Universe would be in the form of compact dark stars, that could be detected as microlensing events. Here we consider the possibility that the dark matter not only interacts with itself, but also with the proton. If this is the case, protons from the interstellar medium could be captured by the compact dark star and eventually thermalize with it. We argue that the thermal radiation emitted by the captured protons could be intense enough to be detected by gammaray or Xray telescopes, thus providing an additional avenue to indirectly detect dark matter.
11:50 AM
Conclusion
Conclusion
11:50 AM  12:10 PM
12:10 PM
Lunch
Lunch
12:10 PM  2:10 PM