253 citations · 750 across the 31 of their papers we have counts for
22 papers · 1 filter
Sub-MeV gamma-ray lines from an endothermic interpretation of the LZ recoil candidate
Maíra Dutra, Jacinto P. Neto, Clarissa Siqueira
Endothermic upscattering of heavy dark matter offers a compelling interpretation of the high-energy nuclear-recoil candidate recently reported by LUX-ZEPLIN (LZ), with a characteri…
Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
Maíra Dutra, Clarissa Siqueira, Tonia M. Venters
Detecting gamma-ray signals that could be due to dark matter (DM) particles would give us invaluable information about the nature of DM. In particular, gamma-ray lines could provid…
Constraints on the Inert Doublet Model of dark matter with very high-energy gamma-ray observatories
Lucca Radicce Justino, Clarissa Siqueira, Aion Viana
We investigate constraints on the Inert Doublet Model (IDM) that features a scalar dark matter candidate, using data from recent and future gamma-ray observatories. The relevance o…
Dark Matter Line Searches with the Cherenkov Telescope Array
S. Abe, J. Abhir, A. Abhishek +562
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from a…
Flavor changing interactions confronted with meson mixing and hadron colliders
A. E. Cárcamo Hernández, L. Duarte, A. S. de Jesus +5
We have witnessed some flavor anomalies appeared in the past years, and explanations based on extended gauge sectors are among the most popular solutions. These beyond the Standard…
Roads for Right-handed Neutrino Dark Matter: Fast Expansion, Standard Freeze-out, and Early Matter Domination
Giorgio Arcadi, Jacinto Paulo Neto, Farinaldo S. Queiroz +1
Right-handed neutrinos appear in several extensions beyond the Standard Model, specially in connection to neutrino masses. Motivated by this, we present a model of right-handed neu…
Indirect Searches for Secluded Dark Matter
C. Siqueira, Guilherme N. Fortes, Aion Viana +1
Dark matter is one of the most important open problems in particle physics and cosmology. Weakly interacting massive particles (WIMPs) appear as an appealing solution, providing th…
Rare Kaon Decay to Missing Energy: Implications of the NA62 Result for a Model
Téssio B. de Melo, Sergey Kovalenko, Farinaldo S. Queiroz +2
Meson decays offer a good opportunity to probe new physics. The rare kaon decay is one of the cleanest of them and, for this reason, is rather sensitiv…
Right-handed Neutrino Dark Matter, Neutrino Masses, and non-Standard Cosmology in a 2HDM
G. Arcadi, S. Profumo, F. S. Queiroz +1
We explore the dark matter phenomenology of a weak-scale right-handed neutrino in the context of a Two Higgs Doublet Model. The expected signal at direct detection experiments is d…
Vector-Like Leptons and Inert Scalar Triplet: Lepton Flavor Violation, and Collider Searches
A. S. de Jesus, S. Kovalenko, F. S. Queiroz +2
We investigate simplified models involving an inert scalar triplet and vector-like leptons that can account for the muon anomaly. These simplified scenarios are embedded in a…
Brazilian Community Report on Dark Matter
E. Abdalla, I. F. M. Albuquerque, A. Alves +52
This white paper summarizes the activities of the Brazilian community concerning dark matter physics and highlights the importance of financial support to Brazilian groups that are…
Explaining the AMS positron excess via Right-handed Neutrinos
Farinaldo S. Queiroz, Clarissa Siqueira
We have witnessed in the past decade the observation of a puzzling cosmic-ray excess at energies larger than GeV. The AMS-02 data published this year has new ingredients such…
Has AMS-02 Observed Two-Component Dark Matter?
Stefano Profumo, Farinaldo Queiroz, Clarissa Siqueira
There is convincing observational evidence for an increasing cosmic-ray positron-to-electron ratio at energies larger than ~GeV, at odds with expectations from secondary p…
Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA)
Clarissa Siqueira
Secluded dark matter is one of the most popular dark matter models, where dark matter annihilations go into particles that belong to a dark sector. An interesting way to probe such…
Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
Farinaldo S. Queiroz, Clarissa Siqueira
Dark matter annihilations have been fiercely restricted by the non-observation of excess events in indirect detection probes. Typically the interactions that dictate annihilation a…
MeV Dark Matter Complementarity and the Dark Photon Portal
Maíra Dutra, Manfred Lindner, Stefano Profumo +3
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to the Standard Model through a dark photon with kinetic mixing with the electromagnetic field. We compute the da…
Searching for Secluded Dark Matter with H.E.S.S., Fermi-LAT, and Planck
Stefano Profumo, Farinaldo S. Queiroz, Joseph Silk +1
Short-lived mediators are often used to describe dark matter interactions with Standard Model particles. When the dark matter mass is heavier than the mass of the mediator, it may…
On the Higgs-like boson in the Minimal Supersymmetric 3-3-1 Model
J. G. Ferreira, C. A. de S. Pires, P. S. Rodrigues da Silva +1
It is imperative that any proposal of new physics possesses a Higgs-like boson with 125 GeV of mass and couplings with the standard particles that recover the branching ratios and…
The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
Giorgio Arcadi, Farinaldo S. Queiroz, Clarissa Siqueira
A puzzling excess in gamma-rays at GeV energies has been observed in the center of our galaxy using Fermi-LAT data. Its origin is still unknown, but it is well fitted by Weakly Int…
Constraining Flavor Changing Interactions from LHC Run-2 Dilepton Bounds with Vector Mediators
Farinaldo S. Queiroz, Clarissa Siqueira, José W. F. Valle
Within the context of vector mediators, is a new signal observed in flavor changing interactions, particularly in the neutral mesons systems , $D^{0}-\bar{D}^{0}…
Higgs mass and right-handed sneutrino WIMP in a supersymmetric 3-3-1 model
C. A. de S. Pires, P. S. Rodrigues da Silva, A. C. O. Santos +1
This work deals with right handed sneutrino as thermal cold dark matter candidate. This scalar emerges in a supersymmetric version of gauge…
Composite Higgs Models, Technicolor and The Muon Anomalous Magnetic Moment
A. Doff, Clarissa Siqueira
We revisit the muon magnetic moment (g-2) in the context of Composite Higgs models and Technicolor, and provide general analytical expressions for computing the muon magnetic momen…