Kingman Cheung
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View article: Probing a heavy dark <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Z</mml:mi> </mml:math> boson at multi-TeV muon colliders: Leveraging the optimized recoil mass technique
Probing a heavy dark boson at multi-TeV muon colliders: Leveraging the optimized recoil mass technique Open
We investigate the discovery potential of multi-TeV muon colliders for a heavy dark Z boson ( Z D ) with a mass above 1 TeV, via the associated production process μ + μ − → Z D γ . This process enables precise reconstruction …
View article: Testing CP-violation in a heavy Higgs sector at CLIC
Testing CP-violation in a heavy Higgs sector at CLIC Open
We propose a method for probing CP-violation in the heavy (pseudo)scalar sector of an extended Higgs model, in which we make simultaneous use of the HVV ( $$V=W^\pm , Z$$ ) and $$Ht\bar{t}$$ interactions of a heavy Higgs …
View article: Searching for charged Higgs bosons via $e^+ e^- \to H^\pm W^\mp S$ at the ILC
Searching for charged Higgs bosons via $e^+ e^- \to H^\pm W^\mp S$ at the ILC Open
We investigate the phenomenology of the charged Higgs boson at the International Linear Collider (ILC) within the framework of the type-X Two-Higgs Doublet Model (2HDM), where a light charged Higgs boson, with a mass around 200 GeV or even…
View article: New Physics Search at the CEPC: a General Perspective
New Physics Search at the CEPC: a General Perspective Open
The Circular Electron-Positron Collider (CEPC), a proposed next-generation Higgs factory, provides new opportunities to explore physics beyond the Standard Model (SM). With its clean electron-positron collision environment and the ability …
View article: Unveiling the invisible: ALPs and sterile neutrinos at the LHC and HL-LHC
Unveiling the invisible: ALPs and sterile neutrinos at the LHC and HL-LHC Open
A bstract We investigate the potential of using the signature of mono-Higgs plus large missing energies to constrain on two new ph ysics models, namely the model of an axion-like particle (ALP) and the model of sterile neutrinos. We focus …
View article: Searching for Dark Photon Tridents Through Primordial Black Hole Signatures
Searching for Dark Photon Tridents Through Primordial Black Hole Signatures Open
The detection of gamma-ray signals from primordial black holes (PBHs) could provide compelling evidence for their role as a dark matter candidate, particularly through the observation of their Hawking radiation. Future gamma-ray observator…
View article: Effects of superradiance in active galactic nuclei
Effects of superradiance in active galactic nuclei Open
A supermassive black hole (SMBH) at the core of an active galactic nucleus (AGN) provides room for the elusive ultra-light scalar particles to be produced through a phenomenon called superradiance. This phenomenon produces a cloud of scala…
View article: Exploring interference effects between two ALP effective operators at the LHC
Exploring interference effects between two ALP effective operators at the LHC Open
A bstract We observe that most studies of axion-like particle (ALP) production channels at the Large Hadron Collider (LHC) focus on a single type of ALP operator for each process in the effective field theory framework. In this work, we pr…
View article: NANOGrav and other PTA signals and PBH from the modified Higgs inflation
NANOGrav and other PTA signals and PBH from the modified Higgs inflation Open
This study investigates the classical Higgs inflation model with a modified Higgs potential featuring a dip. We examine the implications of this modification on the generation of curvature perturbations, stochastic gravitational wave produ…
View article: Associated charged Higgs production within the 2HDM: $e^-e^+$ versus $μ^-μ^+$ colliders
Associated charged Higgs production within the 2HDM: $e^-e^+$ versus $μ^-μ^+$ colliders Open
Our goal is to investigate the charged Higgs phenomenology in the framework of 2HDM at the upcoming $e^+e^-$ and muon colliders. We are primarily concerned with the associated production processes with a fermion pair: $\ell^+ \ell^- \to τ^…
View article: Quark flavor violation and axion-like particles from top-quark decays at the LHC
Quark flavor violation and axion-like particles from top-quark decays at the LHC Open
A bstract We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor…
View article: Probing the gauge-boson couplings of axion-like particle at the LHC and high-luminosity LHC
Probing the gauge-boson couplings of axion-like particle at the LHC and high-luminosity LHC Open
A bstract In this work, we calculate the sensitivities on the gauge-boson couplings g aZZ , g aZγ , and g aWW of an axion-like particle (ALP) that one can achieve at the LHC with $$ \sqrt{s} $$ = 14 TeV and integrated luminosities of 30…
View article: Probing dark photons from a light scalar at Belle II
Probing dark photons from a light scalar at Belle II Open
A bstract In the minimal U(1) extension of the Standard Model (SM), a new gauge boson referred to as “dark photon” is predicted. The dark-photon mass can be generated from an additional Higgs mechanism associated with a dark scalar boson. …
View article: Exploring interference effects between two ALP effective operators at the LHC
Exploring interference effects between two ALP effective operators at the LHC Open
We observe that most studies of axion-like particle (ALP) production channels at the Large Hadron Collider (LHC) focus on a single type of ALP operator for each process in the effective field theory framework. In this work, we propose an a…
View article: Quark flavor violation and axion-like particles from top-quark decays at the LHC
Quark flavor violation and axion-like particles from top-quark decays at the LHC Open
We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor-diagonal …
View article: Probing the Gauge-boson Couplings of Axion-like Particle at the LHC and High-Luminosity LHC
Probing the Gauge-boson Couplings of Axion-like Particle at the LHC and High-Luminosity LHC Open
In this work, we calculate the sensitivities on the gauge-boson couplings $g_{aZZ}$, $g_{aZγ}$, and $g_{aWW}$ of an axion-like particle (ALP) that one can achieve at the LHC with $\sqrt{s}=14$ TeV and integrated luminosities of 300 fb$^{-1…
View article: Interpretation of excess in $H \to Z γ$ using a light axion-like particle
Interpretation of excess in $H \to Z γ$ using a light axion-like particle Open
We interpret the recent excess in a rare decay of the Higgs boson, $H\to Zγ$, using a light axion-like particle (ALP) in the massrange $0.05 - 0.1$ GeV.The dominant decay of such a light ALP is into a pair of collimated photons, whose deca…
View article: Probing dark photons from a light scalar at Belle II
Probing dark photons from a light scalar at Belle II Open
In the minimal $U(1)$ extension of the Standard Model (SM), a new gauge boson referred to as "dark photon" is predicted. The dark-photon mass can be generated from an additional Higgs mechanism associated with a dark scalar boson. At $B$-f…
View article: Comparison between $μ^{-}μ^{+}$ and $e^{-}e^{+}$ colliders for charged Higgs production in 2HDM
Comparison between $μ^{-}μ^{+}$ and $e^{-}e^{+}$ colliders for charged Higgs production in 2HDM Open
We study the phenomenology of the charged Higgs boson at future muon colliders. We investigate both the pair production $μ^+ μ^- \to H^+ H^-$, the single production $μ^+ μ^- \to W^\pm H^\mp$, as well as the Vector Boson Fusion (VBF) $\{e^+…
View article: Leptoquark search at the Forward Physics Facility
Leptoquark search at the Forward Physics Facility Open
In this study, we calculate the sensitivity reach on the vector leptoquark (LQ) ${U}_{1}$ at the experiments proposed in the Forward Physics Facility (FPF), including $\mathrm{FASER}\ensuremath{\nu}$, $\mathrm{FASER}\ensuremath{\nu}2$, FLA…
View article: Axionlike particle search at Higgs factories
Axionlike particle search at Higgs factories Open
We study the potential of the future Higgs factories, including the ILC, CEPC, and FCC-ee with $\sqrt{s}$ = 240-250 GeV on discovering axion-like particles (ALPs) through various production channels in the leptonic final states, $e^+e^- \t…
View article: NANOGrav Signal and PBH from the Modified Higgs Inflation
NANOGrav Signal and PBH from the Modified Higgs Inflation Open
This study investigates the classical Higgs inflation model with a modified Higgs potential featuring a dip. We examine the implications of this modification on the generation of curvature perturbations, stochastic gravitational wave produ…
View article: Constraining the transitional magnetic dipole moment interaction between active and heavy neutrinos with the $$Z'$$ at FASER$$\nu $$
Constraining the transitional magnetic dipole moment interaction between active and heavy neutrinos with the $$Z'$$ at FASER$$\nu $$ Open
We investigate the effects of the transitional magnetic dipole type interactions of the active-to-heavy-neutrino associated with a new neutral gauge boson $$Z'$$ on neutrino-nucleon scattering at the ForwArd Search ExpeRiment- $$\nu $$…
View article: Testing CP-violation in a Heavy Higgs Sector at CLIC
Testing CP-violation in a Heavy Higgs Sector at CLIC Open
We propose to probe CP-violation in the heavy (pseudo)scalar sector of an extended Higgs model, in which we make simultaneous use of the $HVV$ ($V=W^\pm, Z$) and $Ht\bar{t}$ interactions of a heavy Higgs state $H$. The CP-even component of…
View article: Axion Like Particle Search at Higgs Factories
Axion Like Particle Search at Higgs Factories Open
We study the potential of the future Higgs factories, including the ILC, CEPC, and FCC-ee with $\sqrt{s}$ = 240-250 GeV on discovering axion-like particles (ALPs) through various production channels in the leptonic final states, $e^+e^- \t…
View article: Leptoquark search at the Forward Physics Facility
Leptoquark search at the Forward Physics Facility Open
In this study, we calculate the sensitivity reach on the vector leptoquark (LQ) $U_1$ at the experiments proposed in Forward Physics Facility (FPF), including FASER$ν$, FASER$\nu2$, FLArE (10 tons), and FLArE (100 tons) using the neutrino-…
View article: Exploring the universality of hadronic jet classification
Exploring the universality of hadronic jet classification Open
The modeling of jet substructure significantly differs between Parton Shower Monte Carlo (PSMC) programs. Despite this, we observe that machine learning classifiers trained on different PSMCs learn nearly the same function. This means that…
View article: Atmospheric axionlike particles at Super-Kamiokande
Atmospheric axionlike particles at Super-Kamiokande Open
We consider a muonphilic axionlike particle (ALP), denoted as $a$, lighter than twice the muon mass. ALPs of this mass range dominantly decay into a pair of photons, induced by a triangular muon loop. Such light muonphilic ALPs are natural…
View article: The Role of a Heavy Neutrino in the Gamma-Ray Burst GRB-221009A
The Role of a Heavy Neutrino in the Gamma-Ray Burst GRB-221009A Open
Recently, several telescopes, including Swift-BAT, GBM, and LHAASO, have observed the ever highest-energy and long-duration gamma-rays from a gamma-ray burst named as GRB221009A (located at a red-shift of $z=0.151$) on October 9, 2022. Con…