Showing 1–15 of 15 results for author: Jesus, A S

Search for Light Dark Sectors Using Electron-Photon Collisions

Authors: L. Angel, G. Casse, G. Gambini, A. S. de Jesus, V. Kozhuharov, A. Machado, F. S. Queiroz, E. Segreto, J. Smirnov

Abstract: The dark photon is a new gauge boson that naturally arises in many beyond the Standard Model theoretical models, featuring interactions that resemble quantum electrodynamics. Due to this feature, it is often considered the portal between dark and visible sectors. For this reason, it has become the target of many experimental searches worldwide. In this work, we propose a search for dark photons ba… ▽ More The dark photon is a new gauge boson that naturally arises in many beyond the Standard Model theoretical models, featuring interactions that resemble quantum electrodynamics. Due to this feature, it is often considered the portal between dark and visible sectors. For this reason, it has become the target of many experimental searches worldwide. In this work, we propose a search for dark photons based on the Inverse Compton scattering, $γe^- \rightarrow A^\prime e^-$, to be conducted at electron accelerators. In this setup, photons from a laser source would impinge on the accelerated electron beam, producing a dark photon in the final state. We propose an experimental setup to take advantage of the photon counting technique, and we derive the projected sensitivity by considering the energy of the incident photon to be about 1 eV and an electron beam of 3 GeV. We show that this experimental setup could cover an unexplored region of parameter space and constitute a promising probe for dark sectors in the future. △ Less

Submitted 27 February, 2026; originally announced March 2026.

Comments: 24 pages, 10 pages

Brazilian Report on Dark Matter 2024

Authors: I. F. M. Albuquerque, J. Alcaniz, A. Alves, J. Amaral, C. Bonifazi, H. A. Borges, S. Carneiro, L. Casarini, D. Cogollo, A. G. Dias, G. C. Dorsch, A. Esmaili, G. Gil da Silveira, C. Gobel, V. P. Gonçalves, A. S. Jesus, D. Hadjimichef, P. C. de Holanda, R. F. L. Holanda, E. Kemp, A. Lessa, A. Machado, M. V T. Machado, M. Makler, V. Marra , et al. (29 additional authors not shown)

Abstract: One of the key scientific objectives for the next decade is to uncover the nature of dark matter (DM). We should continue prioritizing targets such as weakly-interacting massive particles (WIMPs), Axions, and other low-mass dark matter candidates to improve our chances of achieving it. A varied and ongoing portfolio of experiments spanning different scales and detection methods is essential to max… ▽ More One of the key scientific objectives for the next decade is to uncover the nature of dark matter (DM). We should continue prioritizing targets such as weakly-interacting massive particles (WIMPs), Axions, and other low-mass dark matter candidates to improve our chances of achieving it. A varied and ongoing portfolio of experiments spanning different scales and detection methods is essential to maximize our chances of discovering its composition. This report paper provides an updated overview of the Brazilian community's activities in dark matter and dark sector physics over the past years with a view for the future. It underscores the ongoing need for financial support for Brazilian groups actively engaged in experimental research to sustain the Brazilian involvement in the global search for dark matter particles △ Less

Submitted 8 May, 2025; v1 submitted 22 April, 2025; originally announced April 2025.

Comments: Editor-Convener: Farinaldo Queiroz. Report for the Latin American Association for High Energy, Cosmology and Astroparticle Physics

The Hubble Tension: Relativistic Dark Matter Production from Long-lived Particles

Authors: Alvaro S. de Jesus, Matheus M. A. Paixão, Dêivid R. da Silva, Farinaldo S. Queiroz, Nelson Pinto-Neto

Abstract: The tension between direct measurements of the Hubble constant and those stemming from Cosmic Microwave Background probes has triggered a multitude of studies. The connection between cosmology and particle physics has shown to be a valuable approach to addressing the Hubble tension. In particular, increasing the number of relativistic degrees of freedom in the early universe helps alleviate the pr… ▽ More The tension between direct measurements of the Hubble constant and those stemming from Cosmic Microwave Background probes has triggered a multitude of studies. The connection between cosmology and particle physics has shown to be a valuable approach to addressing the Hubble tension. In particular, increasing the number of relativistic degrees of freedom in the early universe helps alleviate the problem. In this work, we write down effective field theory describing relativistic dark matter production in association with neutrinos leading to a larger $H_0$. We derive limits on the effective energy scale that governs this relativistic production of dark matter as a function of the dark matter mass for fermion, vector, and scalar dark matter fields. In particular, scalar dark matter particles are more effective in increasing the effective number of relativistic species. Also, if they have weak scale masses, then the relativistic production of dark matter should be governed by Planck scale effective operators in order to alleviate the Hubble tension. △ Less

Submitted 23 September, 2024; originally announced September 2024.

Comments: 9 pages, 8 figures

Journal ref: Nucl. Phys. B 1014 (2025) 116889

Vector-Like Fermions and Inert Scalar Solutions to the Muon g-2 Anomaly and collider probes at the HL-LHC and FCC-hh

Authors: Á. S. de Jesus, F. S. Queiroz, J. W. F. Valle, Y. Villamizar

Abstract: We examine simple models with an inert scalar and vector-like leptons that can explain the recent $g_μ-2$ measurement reported at FNAL. Prompted by this exciting result, we explore the viability of a simple interpretation and determine the required parameters. We also embed these models within a 3-3-1 gauge extension of the Standard Model (SM), showing that the $g_μ-2$ anomaly can be accommodated… ▽ More We examine simple models with an inert scalar and vector-like leptons that can explain the recent $g_μ-2$ measurement reported at FNAL. Prompted by this exciting result, we explore the viability of a simple interpretation and determine the required parameters. We also embed these models within a 3-3-1 gauge extension of the Standard Model (SM), showing that the $g_μ-2$ anomaly can be accommodated in agreement with current data. We also show how our theory can be tested at high-energy colliders such as HL-LHC and FCC-hh. △ Less

Submitted 24 April, 2024; v1 submitted 6 December, 2023; originally announced December 2023.

Comments: 9 pages, 6 figures

The H0 trouble: Confronting Non-thermal Dark Matter and Phantom Cosmology with the CMB, BAO, and Type Ia Supernovae data

Authors: Simony S da Costa, Dêivid R da Silva, Álvaro S de Jesus, Nelson Pinto-Neto, Farinaldo S Queiroz

Abstract: We have witnessed different values of the Hubble constant being found in the literature in the past years. Albeit, early measurements often result in an $H_0$ much smaller than those from late-time ones, producing a statistically significant discrepancy, and giving rise to the so-called Hubble tension. The trouble with the Hubble constant is often treated as a cosmological problem. However, the Hu… ▽ More We have witnessed different values of the Hubble constant being found in the literature in the past years. Albeit, early measurements often result in an $H_0$ much smaller than those from late-time ones, producing a statistically significant discrepancy, and giving rise to the so-called Hubble tension. The trouble with the Hubble constant is often treated as a cosmological problem. However, the Hubble constant can be a laboratory to probe cosmology and particle physics models. In our work, we will investigate if the possibility of explaining the $H_0$ trouble using non-thermal dark matter production aided by phantom-like cosmology is consistent with the Cosmic Background Radiation (CMB) and Baryon Acoustic Oscillation (BAO) data. We performed a full Monte Carlo simulation using CMB and BAO datasets keeping the cosmological parameters $Ω_b h^2$, $Ω_c h^2$, $100θ$, $τ_{opt}$, and $w$ as priors and concluded that a non-thermal dark matter production aided by phantom-like cosmology yields at most $H_0=70.5$ km s$^{-1}$Mpc$^{-1}$ which is consistent with some late-time measurements. However, if $H_0> 72$ km s$^{-1}$ Mpc$^{-1}$ as many late-time observations indicate, an alternative solution to the Hubble trouble is needed. Lastly, we limited the fraction of relativistic dark matter at the matter-radiation equality to be at most 1\%. △ Less

Submitted 22 November, 2023; v1 submitted 13 November, 2023; originally announced November 2023.

Comments: 13 pages and 5 figures

Constraints on Hidden Sectors Using Rare Kaon Decays

Authors: D. Cogollo, M. J. Neves, Tessio B. de Melo, Alvaro S. de Jesus, Y. M. Oviedo-Torres, F. S. Queiroz

Abstract: The charged Kaon meson ($K^+$) features several hadronic decay modes, but the most relevant contribution to its decay width stems from the leptonic decay $K^+ \rightarrow μ^+ ν_μ$. Given the precision acquired on the rare decay mode $K^+ \rightarrow μ^+ ν_μ+ X$, one can use the data to set constraints on sub-GeV hidden sectors featuring light species that could contribute to it. Light gauge bosons… ▽ More The charged Kaon meson ($K^+$) features several hadronic decay modes, but the most relevant contribution to its decay width stems from the leptonic decay $K^+ \rightarrow μ^+ ν_μ$. Given the precision acquired on the rare decay mode $K^+ \rightarrow μ^+ ν_μ+ X$, one can use the data to set constraints on sub-GeV hidden sectors featuring light species that could contribute to it. Light gauge bosons that couple to muons could give rise to sizeable contributions. In this work, we will use data from the $K^+ \rightarrow μ^+ν_μ l^+l^-$, and $K^+ \rightarrow μ^+ ν_μ ν\barν$ decays to place limits on light vector bosons present in Two Higgs Doublet Models (2HDM) augmented by an Abelian gauge symmetry, 2HDM-$U(1)_X$. We put our findings into perpective with collider bounds, atomic parity violation, neutrino-electron scattering, and polarized electron scattering probes to show that rare Kaon decays provide competitive bounds in the sub-GeV mass range for different values of $\tanβ$. △ Less

Submitted 30 October, 2023; originally announced October 2023.

Comments: 11 pages, 6 figures

Toward a search for axion-like particles at the LNLS

Authors: L. Angel, P. Arias, C. O. Dib, A. S. de Jesus, S. Kuleshov, V. Kozhuharov, L. Lin, M. Lindner, F. S. Queiroz, R. C. Silva, Y. Villamizar

Abstract: Axion-Like Particles (ALPs) appear in several dark sector studies. They have gained increasing attention from the theoretical and experimental community. In this work, we propose the first search for ALPs to be conducted at the Brazilian Synchrotron Light Laboratory (LNLS). In this work, we derive the projected sensitivity of a proposed experiment for the production of ALPs via the channel… ▽ More Axion-Like Particles (ALPs) appear in several dark sector studies. They have gained increasing attention from the theoretical and experimental community. In this work, we propose the first search for ALPs to be conducted at the Brazilian Synchrotron Light Laboratory (LNLS). In this work, we derive the projected sensitivity of a proposed experiment for the production of ALPs via the channel $e^+ e^- \to a γ$. We show that such an experiment could probe ALP masses between $1-55\,\mbox{MeV}$, and ALP-electron couplings down to $g_{aee}=2-6\times10^{-4} \,\mbox{GeV}^{-1}$ depending on the energy beam, thickness of the target, and background assumptions. Therefore, this quest would cover an unexplored region of parameter space for experiments of this kind, constitute a promising probe for dark sectors, and potentially become the first Latin-American dark sector detector. △ Less

Submitted 22 May, 2023; originally announced May 2023.

Comments: 10 pages, 8 figures

On the Role of LHC and HL-LHC in Constraining Flavor Changing Neutral Currents

Authors: S. Kovalenko, A. S. de Jesus, A. R. Zerwekh, Y. M. Oviedo-Torres, F. S. Queiroz, T. B. de Melo, J. P. Neto, Y. S. Villamizar

Abstract: The Standard Model (SM) has no flavor-changing neutral current (FCNC) processes at the tree level. Therefore, processes featuring FCNC in new physics are tightly constrained by data. Typically, the lower bounds on the scale of new physics obtained from $K-\bar{K}$ or $B-\bar{B}$ mixing lie well above 10 TeV, surpassing the reach of current and future colliders. In this paper, we demonstrate, using… ▽ More The Standard Model (SM) has no flavor-changing neutral current (FCNC) processes at the tree level. Therefore, processes featuring FCNC in new physics are tightly constrained by data. Typically, the lower bounds on the scale of new physics obtained from $K-\bar{K}$ or $B-\bar{B}$ mixing lie well above 10 TeV, surpassing the reach of current and future colliders. In this paper, we demonstrate, using a specific Z' model, that such limits can be severely weakened by applying certain parametrizations of the quark mixing matrices with no prejudice while maintaining the CKM matrix in agreement with the data. We highlight the valuable role of the often-overlooked D0 mixing in deriving robust FCNC limits and show that the LHC and HL-LHC are promising probes for flavor-changing interactions mediated by a Z' boson. △ Less

Submitted 4 December, 2023; v1 submitted 31 March, 2023; originally announced April 2023.

Comments: 11 pages, 7 figures

The Hubble Rate Trouble: An Effective Field Theory of Dark Matter

Authors: Alvaro S. de Jesus, Nelson Pinto-Neto, Farinaldo S. Queiroz, Joseph Silk, Dêivid R. da Silva

Abstract: The Hubble constant inferred from the 6-parameter fit to the CMB power spectrum conflicts with the value obtained from direct measurements via type Ia supernova and Cepheids observations. We write down effective operators involving spin-0, spin-1/2, and spin-1 dark matter that lead to the relativistic production of dark matter particles at early times, and consequently lead to an increase in the n… ▽ More The Hubble constant inferred from the 6-parameter fit to the CMB power spectrum conflicts with the value obtained from direct measurements via type Ia supernova and Cepheids observations. We write down effective operators involving spin-0, spin-1/2, and spin-1 dark matter that lead to the relativistic production of dark matter particles at early times, and consequently lead to an increase in the number of relativistic degrees of freedom. This mechanism which is amenable to CMB, BBN, and structure formation observables can sufficiently raise the value of the Hubble constant derived from CMB and reconcile local and CMB probes of the Hubble constant. This mechanism alone increases $H_0$ up to $70\, {\rm km s^{-1} Mpc^{-1}}$, and with the help of a Phantom-like cosmology, reach $H_0 \simeq 71-73\, {\rm km s^{-1} Mpc^{-1}}$. Lastly, we outline the region of parameter space which reproduces $H_0 \simeq 71-73\, {\rm km s^{-1} Mpc^{-1}}$ while obeying all relevant constraints. △ Less

Submitted 26 December, 2022; originally announced December 2022.

Comments: 10 pages and 14 figures

Flavor changing interactions confronted with meson mixing and hadron colliders

Authors: A. E. Cárcamo Hernández, L. Duarte, A. S. de Jesus, S. Kovalenko, F. S. Queiroz, C. Siqueira, Y. M. Oviedo-Torres, Y. Villamizar

Abstract: 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 Model (SM) theories often assume flavor changing interactions mediated by new vector bosons, but at the same time they could yield deviations from the SM in the $K^{0}-\bar{K}^{0}$, $D^{0}-\bar{D}^{0}$,… ▽ More 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 Model (SM) theories often assume flavor changing interactions mediated by new vector bosons, but at the same time they could yield deviations from the SM in the $K^{0}-\bar{K}^{0}$, $D^{0}-\bar{D}^{0}$, $B^0_d-\bar{B^0}_d$ and $B^0_s-\bar{B^0}_s$ meson systems. Using up-to-date data on the mass difference of these meson systems, we derive lower mass bounds on vector mediators for two different parametrizations of the quark mixing matrices. Focusing on a well-motivated model, based on the fundamental representation of the weak SU(3) gauge group, we put our findings into perspective with current and future hadron colliders to conclude that meson mass systems can give rise to bounds much more stringent than those from high-energy colliders and that recent new physics interpretations of the $b\rightarrow s$ and $R(D^{\ast})$ anomalies are disfavored. △ Less

Submitted 21 February, 2023; v1 submitted 17 August, 2022; originally announced August 2022.

Comments: 6 figures, 9 pages

Search for Leptophilic Dark Matter at the LHeC

Authors: Guo-yuan Huang, Sudip Jana, Alvaro S. de Jesus, Farinaldo S. Queiroz, Werner Rodejohann

Abstract: The Large Hadron electron Collider (LHeC) has been designed to push the field of deep inelastic scattering to the high energy and intensity frontier using an intense electron beam with a proton beam from the High Luminosity-Large Hadron Collider. However, LHeC is also a great laboratory for new physics. In this work, we propose a search for dark matter that couples with leptons. This may yield… ▽ More The Large Hadron electron Collider (LHeC) has been designed to push the field of deep inelastic scattering to the high energy and intensity frontier using an intense electron beam with a proton beam from the High Luminosity-Large Hadron Collider. However, LHeC is also a great laboratory for new physics. In this work, we propose a search for dark matter that couples with leptons. This may yield $ej$+ missing energy and $μj$ + missing energy signals that can be potentially observed through simple missing-energy cuts that suppress the Standard Model background. Considering direct dark matter detection and LHC constraints, we show that LHeC can indeed discover a weak scale dark matter fermion for masses up to 350 GeV, which reproduces the correct relic density, and has interesting implications for lepton flavor violation. △ Less

Submitted 4 July, 2022; originally announced July 2022.

Comments: 5 pages and 5 figures

Search for Dark Sector by Repurposing the UVX Brazilian Synchrotron

Authors: L. Duarte, L. Lin, M. Lindner, V. Kozhuharov, S. V. Kuleshov, A. S. de Jesus, F. S. Queiroz, Y. Villamizar, H. Westfahl Jr

Abstract: We propose the first Search for Dark Sector at the Brazilian Synchrotron Light Laboratory, site of Sirius, a fourth-generation storage ring. We show that UVX, Sirius predecessor, can be a promising dark sector detector, SeDS, with unprecedented sensitivity. The search is based on a 1-3 GeV positron beam impinging on a thick target leading the $e^+ e^- \rightarrow γA'$ reaction, followed by a missi… ▽ More We propose the first Search for Dark Sector at the Brazilian Synchrotron Light Laboratory, site of Sirius, a fourth-generation storage ring. We show that UVX, Sirius predecessor, can be a promising dark sector detector, SeDS, with unprecedented sensitivity. The search is based on a 1-3 GeV positron beam impinging on a thick target leading the $e^+ e^- \rightarrow γA'$ reaction, followed by a missing mass spectrum event reconstruction. We show that SeDS has the potential to probe dark photons with masses up to 55 MeV and kinetic coupling down to $ε\sim 10^{-14}$ within months of data. Therefore, such experiment would constitute the best dark photon probe worldwide in the 10-55 MeV mass range, being able to probe an unexplored region of parameter space. △ Less

Submitted 10 June, 2022; originally announced June 2022.

Comments: 5 figures, Toward the First Latin American Dark Sector Detector

A 2HDM for the g-2 and Dark Matter

Authors: Giorgio Arcadi, Álvaro S. de Jesus, Téssio B. de Melo, Farinaldo S. Queiroz, Yoxara S. Villamizar

Abstract: The Muon g-2 experiment at FERMILAB has confirmed the muon anomalous magnetic moment anomaly with an error bar 15% smaller and a different central value compared with the previous Brookhaven result. The combined results from FERMILAB and Brookhaven show a difference with theory at a significance of $4.2σ$, strongly indicating the presence of new physics. In light of this new result, we discuss a T… ▽ More The Muon g-2 experiment at FERMILAB has confirmed the muon anomalous magnetic moment anomaly with an error bar 15% smaller and a different central value compared with the previous Brookhaven result. The combined results from FERMILAB and Brookhaven show a difference with theory at a significance of $4.2σ$, strongly indicating the presence of new physics. In light of this new result, we discuss a Two Higgs Doublet model augmented by an Abelian gauge symmetry that can simultaneously accommodate a light dark matter candidate and $(g-2)_μ$, in agreement with existing bounds. △ Less

Submitted 8 February, 2022; v1 submitted 9 April, 2021; originally announced April 2021.

Comments: 9 pages, 8 figures. Text improved. Bounds from parity violation experiments included. Expanded discussion. References added

Report number: IIP-2021

Vector-Like Leptons and Inert Scalar Triplet: Lepton Flavor Violation, $g-2$ and Collider Searches

Authors: A. S. de Jesus, S. Kovalenko, F. S. Queiroz, K. Sinha, C. Siqueira

Abstract: We investigate simplified models involving an inert scalar triplet and vector-like leptons that can account for the muon $g-2$ anomaly. These simplified scenarios are embedded in a model that features W' and Z' bosons, which are subject to stringent collider bounds. The constraints coming from the muon $g-2$ anomaly are put into perspective with collider bounds, as well as bounds coming from lepto… ▽ More We investigate simplified models involving an inert scalar triplet and vector-like leptons that can account for the muon $g-2$ anomaly. These simplified scenarios are embedded in a model that features W' and Z' bosons, which are subject to stringent collider bounds. The constraints coming from the muon $g-2$ anomaly are put into perspective with collider bounds, as well as bounds coming from lepton flavor violation searches. The region of parameter space that explains the $g-2$ anomaly is shown to be within reach of lepton flavor violation probes and future colliders such as HL-LHC and HE-LHC. △ Less

Submitted 19 July, 2020; v1 submitted 2 April, 2020; originally announced April 2020.

Comments: 8 pages, 6 figures. Version accepted for publication in PRD

Journal ref: Phys. Rev. D 102, 035004 (2020)

Dead or Alive? Implications of the Muon Anomalous Magnetic Moment for 3-3-1 Models

Authors: Alvaro S. de Jesus, Sergey Kovalenko, Farinaldo S. Queiroz, Carlos A. de S. Pires, Yoxara S. Villamizar

Abstract: We have witnessed a persistent puzzling anomaly in the muon magnetic moment that cannot be accounted for in the Standard Model even considering the large hadronic uncertainties. A new measurement is forthcoming, and it might give rise to a $5σ$ claim for physics beyond the Standard Model. Motivated by it, we explore the implications of this new result to five models based on the… ▽ More We have witnessed a persistent puzzling anomaly in the muon magnetic moment that cannot be accounted for in the Standard Model even considering the large hadronic uncertainties. A new measurement is forthcoming, and it might give rise to a $5σ$ claim for physics beyond the Standard Model. Motivated by it, we explore the implications of this new result to five models based on the $SU(3)_C \times SU(3)_L \times U(1)_N$ gauge symmetry and put our conclusions into perspective with LHC bounds. We show that previous conclusions found in the context of such models change if there are more than one heavy particle running in the loop. Moreover, having in mind the projected precision aimed by the g-2 experiment at FERMILAB, we place lower mass bounds on the particles that contribute to muon anomalous magnetic moment assuming the anomaly is resolved otherwise. Lastly, we discuss how these models could accommodate such anomaly in agreement with existing bounds. △ Less

Submitted 27 August, 2022; v1 submitted 13 March, 2020; originally announced March 2020.

Comments: 14 pages, 12 figures

Report number: IIPDM-2020