Pyungwon Ko
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View article: Linking the KM3-230213A neutrino event to dark matter decay and gravitational wave signals
Linking the KM3-230213A neutrino event to dark matter decay and gravitational wave signals Open
The KM3NeT collaboration recently reported the detection of an ultra-high-energy (UHE) neutrino event, dubbed KM3-230213A. This is the first observed neutrino event with energy of the order of 𝒪(100) PeV, the origin of which remains unclea…
View article: 96 GeV scalar boson in the 2HDM with U(1)H gauge symmetry
96 GeV scalar boson in the 2HDM with U(1)H gauge symmetry Open
In this paper, we study two Higgs doublet models with gauged $$U(1)_H$$ symmetry instead of the usual softly broken $$Z_2$$ symmetry, motivated by the excesses around 96 GeV reported by the CMS collaboration in the searches fo…
View article: Searching for elusive dark Higgs boson in spin-1/2 inelastic dark matter models at Belle II
Searching for elusive dark Higgs boson in spin-1/2 inelastic dark matter models at Belle II Open
A bstract Spin-1/2 inelastic dark matter (DM) models are popular among sub-GeV to GeV thermal DM scenarios due to the dominant role of co-annihilation in determining the DM relic abundance. In these models, the dark Higgs boson plays a cru…
View article: Explaining Data Anomalies over the NMSSM Parameter Space with Deep Learning Techniques
Explaining Data Anomalies over the NMSSM Parameter Space with Deep Learning Techniques Open
Motivated by recent results from particle physics analyses, we investigate the Next-to-Minimal Supersymmetric Standard Model (NMSSM) as a framework capable of accommodating a range of current data anomalies across low- and high-energy expe…
View article: Parental hesitancy on COVID-19 vaccination of children under the age of 16: A cross-sectional mixed-methods study among factory workers
Parental hesitancy on COVID-19 vaccination of children under the age of 16: A cross-sectional mixed-methods study among factory workers Open
Background Thanks to the development of COVID-19 vaccines, now they can be safely and effectively used to guard COVID-19 patients against severe illness, hospitalization, and even mortality. However, parents’ unwillingness to vaccinate the…
View article: The minimal cosmological standard model
The minimal cosmological standard model Open
We propose a novel minimal scenario which simultaneously addresses the following theoretical/cosmological/phenomenological puzzles: (i) the origin of scales, (ii) primordial inflation, (iii) matter-antimatter asymmetry, (iv) tiny neutrino …
View article: Multi-component dark matter and Galactic 511 keV γ-ray emission
Multi-component dark matter and Galactic 511 keV γ-ray emission Open
A bstract We study multi-component dark matter scenarios and the Galactic 511 keV γ -ray emission line signal in the framework of a local, dark U(1) D extension of the Standard Model. A light vector dark matter particle associated with the…
View article: Recent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math> excess and muon <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:math> illuminating light dark sector with Higgs portal
Recent excess and muon illuminating light dark sector with Higgs portal Open
The Belle II collaboration recently announced that they observed the B+→K+νν¯ decay process for the first time. However, their result encounters a 2.7σ deviation from the Standard Model (SM) calculation. Additionally, Fermilab released new…
View article: Muon (g − 2) and thermal WIMP DM in $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models
Muon (g − 2) and thermal WIMP DM in $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models Open
A bstract The $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ model is anomaly-free with the Standard Model (SM) fermion content, and can make substantial contributions to the muon ( g − 2) at the level of ∆ a μ ∼ O (10) × 10 − 1…
View article: Axi-Majoron: One-shot solution to most of the big puzzles of particle cosmology
Axi-Majoron: One-shot solution to most of the big puzzles of particle cosmology Open
The details of the minimal cosmological standard model (MCSM) proposed in [The minimal cosmological standard model, .] are discussed. The model is based on the scale-symmetry and the global Peccei-Quinn (PQ) symmetry with a key assumption …
View article: 96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry
96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry Open
In this paper, we study two Higgs doublet models with gauged U(1)_H symmetry, motivated by the excesses around 96 GeV reported by the CMS collaboration in the searches for light resonances decaying to two photons and two τ's. In this model…
View article: Exploring exotic decays of the Higgs boson to multi-photons at the LHC via multimodal learning approaches
Exploring exotic decays of the Higgs boson to multi-photons at the LHC via multimodal learning approaches Open
A bstract The Standard Model (SM) Higgs boson, the most recently discovered elementary particle, may still serve as a mediator between the SM sector and a new physics sector related to dark matter (DM). The Large Hadron Collider (LHC) has …
View article: Multi-component dark matter and Galactic 511 keV $γ$-ray emission
Multi-component dark matter and Galactic 511 keV $γ$-ray emission Open
We study multi-component dark matter scenarios and the Galactic 511 keV $γ$-ray emission line signal in the framework of a local, dark $U(1)_D$ extension of the Standard Model. A light vector dark matter particle associated with the dark $…
View article: Gauged Q-ball dark matter through a cosmological first-order phase transition
Gauged Q-ball dark matter through a cosmological first-order phase transition Open
View article: Exploring Exotic Decays of the Higgs Boson to Multi-Photons at the LHC via Multimodal Learning Approaches
Exploring Exotic Decays of the Higgs Boson to Multi-Photons at the LHC via Multimodal Learning Approaches Open
The Standard Model (SM) Higgs boson, the most recently discovered elementary particle, may still serve as a mediator between the SM sector and a new physics sector related to dark matter (DM). The Large Hadron Collider (LHC) has not yet fu…
View article: Interplay between Higgs inflation and dark matter models with dark U(1) gauge symmetry
Interplay between Higgs inflation and dark matter models with dark U(1) gauge symmetry Open
A bstract We investigate dark matter phenomenology and Higgs inflation in a dark U(1) D -extended model. The model features two dark matter candidates, a dark fermion and a dark vector boson. When the fermion dark matter ψ is heavier than …
View article: Constraining Millicharged dark matter with Gravitational positivity bounds
Constraining Millicharged dark matter with Gravitational positivity bounds Open
Gravitational positivity bounds provide consistency conditions for effective field theories with gravity. They turn out to be phenomenologically useful by providing lower bounds in parameters of new physics beyond the Standard Models (BSM)…
View article: Light thermal self-interacting dark matter in the shadow of non-standard cosmology
Light thermal self-interacting dark matter in the shadow of non-standard cosmology Open
In this paper, we construct a viable model for a GeV scale self-interacting dark matter (DM), where the DM was thermally produced in the early universe. Here, a new vector-like fermion with a dark charge under the U(1)_D gauge symmetry ser…
View article: Axi-Majoron : One-shot solution to most of the big puzzles of particle cosmology
Axi-Majoron : One-shot solution to most of the big puzzles of particle cosmology Open
The details of the minimal cosmological standard model (MCSM) proposed in [arXiv:2403.05390.] are discussed. The model is based on the scale-symmetry and the global Peccei-Quinn(PQ) symmetry with a key assumption that the latter is broken …
View article: The minimal cosmological standard model
The minimal cosmological standard model Open
We propose a novel minimal scenario which simultaneously addresses the following theoretical/cosmological/phenomenological puzzles: (i) the origin of scales, (ii) primordial inflation, (iii) matter-antimatter asymmetry, (iv) tiny neutrino …
View article: An unfamiliar way to generate the hierarchy of standard model fermion masses
An unfamiliar way to generate the hierarchy of standard model fermion masses Open
A bstract While the properties of the observed Higgs boson agree with the Standard Model predictions, the hierarchy of fermion masses lacks an explanation within the model. In this work, we consider a fresh approach to this problem, involv…
View article: Gravitational wave probes on self-interacting dark matter surrounding an intermediate mass black hole
Gravitational wave probes on self-interacting dark matter surrounding an intermediate mass black hole Open
The presence of dark matter overdensities surrounding a black hole can influence the evolution of a binary system. The gravitational wave signals emitted by a black hole binary offer a promising means to probe the dark matter environments …
View article: Recent $B^+ \!\to K^+ν\barν$ excess and muon $g-2$ illuminating light dark sector with Higgs portal
Recent $B^+ \!\to K^+ν\barν$ excess and muon $g-2$ illuminating light dark sector with Higgs portal Open
The Belle II collaboration recently announced that they observed the $B^+ \!\to K^+ν\barν$ decay process for the first time. This dineutrino mode of $B^+ \!\to K^+ν\barν$ has been theoretically identified as a very clean channel. However, …
View article: Pseudo Nambu-Goldstone Boson DM with Linear Symmetry Breaking: Revisited
Pseudo Nambu-Goldstone Boson DM with Linear Symmetry Breaking: Revisited Open
In this work, we revisit pseudo Nambu Goldstone boson (pNGB) DM model where global $U(1)$ dark symmetry is spontaneously broken as well as explicitly with broken by with linear symmetry breaking, focusing on the dark matter mass range in $…
View article: Explaining ATOMKI, $(g-2)_μ$, and MiniBooNE anomalies with light mediators in $U(1)_H$ extended model
Explaining ATOMKI, $(g-2)_μ$, and MiniBooNE anomalies with light mediators in $U(1)_H$ extended model Open
We consider $U(1)_H$ extensions of Type-I 2HDM plus a singlet scalar $ϕ_H$, introducing a new Higgs doublet $H_2$ and a singlet $ϕ_H$ charged under $U(1)_H$. The SM Higgs doublet $H_1$ as well as all the SM fermions and three right-handed …
View article: Uncovering doubly charged scalars with dominant three-body decays using machine learning
Uncovering doubly charged scalars with dominant three-body decays using machine learning Open
A bstract We propose a deep learning-based search strategy for pair production of doubly charged scalars undergoing three-body decays to $$ {W}^{+}t\overline{b} $$ in the same-sign lepton plus multi-jet final state. This process is…
View article: Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard Cosmology
Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard Cosmology Open
In this paper, we construct a viable model for a GeV scale self-interacting dark matter (DM), where the DM was thermally produced in the early universe. Here, a new vector-like fermion with a dark charge under the $U(1)_{D}$ gauge symmetry…
View article: An Unfamiliar Way to Generate the Hierarchy of Standard Model Fermion Masses
An Unfamiliar Way to Generate the Hierarchy of Standard Model Fermion Masses Open
While the properties of the observed Higgs boson agree with the Standard Model predictions, the hierarchy of fermion masses lacks an explanation within the model. In this work, we propose a fresh approach to this problem, involving a diffe…
View article: Interplay between Higgs inflation and dark matter models with dark $U(1)$ gauge symmetry
Interplay between Higgs inflation and dark matter models with dark $U(1)$ gauge symmetry Open
We investigate dark matter phenomenology and Higgs inflation in a dark $U(1)_D$-extended model. The model features two dark matter candidates, a dark fermion and a dark vector boson. When the fermion dark matter $ψ$ is heavier than the vec…
View article: Gravitational wave probes on self-interacting dark matter surrounding an intermediate mass black hole
Gravitational wave probes on self-interacting dark matter surrounding an intermediate mass black hole Open
The presence of dark matter overdensities surrounding a black hole can influence the evolution of a binary system. The gravitational wave signals emitted by a black hole binary offer a promising means to probe the dark matter environments …