MOCa 2022: Materia Oscura en Colombia

Contribution List

15. Complementarity of experiments in probing the non-relativistic effective theory of dark matter-nucleon interactions

Anja Brenner

31/05/2022, 09:00

The non-relativistic effective theory of WIMP-nucleon 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 non-zero. On the other hand, dark matter models generically lead in the non-relativistic limit to several...

11. Fermion and scalar two-component dark matter from a Z4 symmetry

Carlos E. Yaguna

31/05/2022, 09:45

We study a two-component 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...

12. Multicomponent dark matter: recent developments

31/05/2022, 10:50

In this talk I will discuss some recent developments concerning scenarios of multi-component dark matter based on a single ZN symmetry.

13. Scalar potential analysis of the Z5 multi-component dark matter model

Diego Ríos (Universidad de Antioquia)

31/05/2022, 11:20

In recent years the multi-component 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...

5. Flavor violating $\ell_i$ decay into $\ell_j$ and a light gauge boson

Bibiana Marcela Marín Ochoa

31/05/2022, 14:00

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 spin-one $\chi$. 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...

16. Dark matter from dark photon signal classification at DUNE near detector with machine learning

Guillermo Palacio

31/05/2022, 14:45

We study a scalar dark matter (DM) model with two DM species coupled to the Standard Model (SM) particles via a sub-GeV dark photon. The two DM candidates can be produced at fixed-target 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.

14. Effective Dirac Neutrino Mass Operator in the Standard Model With a Local Abelian Extension

DAVID ALEJANDRO SUAREZ ROLDAN

31/05/2022, 15:30

We present 48 types of solutions to the anomaly cancellation conditions of local Abelian extensions of the Standard Model (SM) with right-handed SM-singlet 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 multi-component and...

18. Gauged Baryon or Lepton number

DIEGO ALEJANDRO RESTREPO QUINTERO

01/06/2022, 09:00

4. A dark matter connection in a flavored axion model

Eduardo Rojas

01/06/2022, 09:45

A Peccei-Quinn (PQ) symmetry is proposed, in order to generate in the Standard Model (SM) quark sector a realistic mass matrix ansatz with five texture-zeros. 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...

7. Dark Matter in the Time of Primordial Black Holes

Nicolás Bernal (Universidad Antonio Nariño)

01/06/2022, 10:50

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 freeze-out or freeze-in, 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...

17. Observational signatures of compact dark stars

Alejandro Ibarra

01/06/2022, 11:20

If the dark matter particle has self-interactions, 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...

9. A new software to compute MSSM squared amplitudes for particle physics and relic density calculations

Marco PALMIOTTO (Institut de physique des deux infinis Lyon, Université Claude Bernard Lyon 1)

The increasing need of numerical predictions for dark matter models is not always easy to satisfy looking at the software available today. With this work, we present a code to compute 2 to 2 squared scattering amplitudes using MARTY, with all the benefits of having a fully open source C++ code to handle. The numerical library generated in this way has been enriched with additional features,...

3. Gauged Baryon or Lepton number

Diego Restrepo

We present Abelian extension of the standard model with collider constraints under control

6. Supermassive black hole formation in scalar field dark matter models

Luis Enrique Padilla Albores

Scalar-field dark matter (SFDM) halos exhibit a core-envelope structure with soliton-like cores and CDM-like envelopes. Simulations without self-interaction (free-field case) report a core-halo mass relation which can be understood if core and halo obey certain energy or velocity scalings. By extending the core-halo mass relations to include SFDM with self-interaction, in this talk we examine...