Yang Zhang
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View article: The bubble wall velocity in local thermal equilibrium and energy budget with full effective potential
The bubble wall velocity in local thermal equilibrium and energy budget with full effective potential Open
A bstract We develop a framework based on the full one-loop finite-temperature effective potential model, within which the bubble wall velocity is calculated using the local thermal equilibrium (LTE) approximation, and the kinetic energy f…
View article: Machine Learning Left-Right Breaking from Gravitational Waves
Machine Learning Left-Right Breaking from Gravitational Waves Open
First-order phase transitions in the early universe can generate stochastic gravitational waves (GWs), offering a unique probe of high-scale particle physics. The Left-Right Symmetric Model (LRSM), which restores parity symmetry at high en…
View article: PhaseTracer2: from the effective potential to gravitational waves
PhaseTracer2: from the effective potential to gravitational waves Open
In recent years, the prospect of detecting gravitational waves sourced from a strongly first-order cosmological phase transition has emerged as one of the most exciting frontiers of gravitational wave astronomy. Cosmological phase transiti…
View article: Construction of directed strongly regular graphs as generalized Cayley graphs
Construction of directed strongly regular graphs as generalized Cayley graphs Open
Directed strongly regular graphs were introduced by Duval in 1998 as one of the possible generalization of classical strongly regular graphs to the directed case. Duval also provided several construction methods for directed strongly regul…
View article: Exploring multi-step electroweak phase transitions in the 2HDM+$$\varvec{a}$$
Exploring multi-step electroweak phase transitions in the 2HDM+$$\varvec{a}$$ Open
Multiple electroweak phase transitions occurring sequentially in the early universe can give rise to intriguing phenomenology, compared to the typical single-step electroweak phase transition. In this work, we investigate this scenario wit…
View article: Searching for Neutrinoless Double-Beta Decay of $^{136}$Xe with PandaX-4T
Searching for Neutrinoless Double-Beta Decay of $^{136}$Xe with PandaX-4T Open
We report the search for neutrinoless double-beta decay of $^{136}$Xe from the PandaX-4T experiment with a 3.7-tonne natural xenon target. The data reconstruction and the background modeling are optimized in the MeV energy region. A blind …
View article: PhaseTracer2: from the effective potential to gravitational waves
PhaseTracer2: from the effective potential to gravitational waves Open
In recent years, the prospect of detecting gravitational waves sourced from a strongly first-order cosmological phase transition has emerged as one of the most exciting frontiers of gravitational wave astronomy. Cosmological phase transiti…
View article: Regularized stress tensor of vector fields in de Sitter space
Regularized stress tensor of vector fields in de Sitter space Open
We study the Stueckelberg field in de Sitter space, which is a massive vector field with the gauge fixing (GF) term $\frac{1}{2ζ} (A^μ\,_{;\, μ})^2$. We obtain the vacuum stress tensor, which consists of the transverse, longitudinal, tempo…
View article: HL-LHC sensitivity to higgsinos from natural SUSY with gravitino LSP
HL-LHC sensitivity to higgsinos from natural SUSY with gravitino LSP Open
In the realm of natural supersymmetric models, higgsinos are typically the lightest electroweakinos. In gauge-mediated supersymmetry breaking models, the lightest higgsino-dominated particles decay into a Z -boson or a Higgs boson ( h ), a…
View article: New vacuum stability limit from cosmological history
New vacuum stability limit from cosmological history Open
The stability of the electroweak vacuum imposes important constraints on new physics models. Such new physics models may introduce one or more new thermal phases with a lower free energy than that of the electroweak vacuum. In this case, t…
View article: Search for Cosmic-ray Boosted Sub-MeV Dark-Matter-Electron Scattering in PandaX-4T
Search for Cosmic-ray Boosted Sub-MeV Dark-Matter-Electron Scattering in PandaX-4T Open
We report the first search for the elastic scatterings between cosmic-ray boosted sub-MeV dark matter and electrons in the PandaX-4T liquid xenon experiment. Sub-MeV dark matter particles can be accelerated by scattering with electrons in …
View article: Detecting Neutrinos from Supernova Bursts in PandaX-4T
Detecting Neutrinos from Supernova Bursts in PandaX-4T Open
Neutrinos from core-collapse supernovae are essential for the understanding of neutrino physics and stellar evolution. The dual-phase xenon dark matter detectors can provide a way to track explosions of galactic supernovae by detecting neu…
View article: Measurement of Solar $pp$ Neutrino Flux using Electron Recoil Data from PandaX-4T Commissioning Run
Measurement of Solar $pp$ Neutrino Flux using Electron Recoil Data from PandaX-4T Commissioning Run Open
The proton-proton ($pp$) fusion chain dominates the neutrino production from the Sun. The uncertainty of the predicted $pp$ neutrino flux is at the sub-percent level, whereas that of the best measurement is $\mathcal{O}(10\%)$. In this pap…
View article: HL-LHC sensitivity to higgsinos from natural SUSY with gravitino LSP
HL-LHC sensitivity to higgsinos from natural SUSY with gravitino LSP Open
In the realm of natural supersymmetric models, higgsinos are typically the lightest electroweakinos. In gauge-mediated supersymmetry breaking models, the lightest higgsino-dominated particles decay into a $Z$-boson or a Higgs boson ($h$), …
View article: Search for Dark-Matter–Nucleon Interactions with a Dark Mediator in PandaX-4T
Search for Dark-Matter–Nucleon Interactions with a Dark Mediator in PandaX-4T Open
We report results of a search for dark-matter–nucleon interactions via a dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With the ionization-signal-only data and utilizing the Migdal effect, we set…
View article: Reconstructing masses for semi-invisibly decaying particles pair-produced at lepton colliders
Reconstructing masses for semi-invisibly decaying particles pair-produced at lepton colliders Open
We present a set of Lorentz invariant kinematic variables for reconstructing mass of semi-invisible decaying particles pair-produced at lepton colliders, ${m}_{\mathrm{RC}}^{\mathrm{min}}$, ${m}_{\mathrm{RC}}^{\mathrm{max}}$, and ${m}_{\ma…
View article: Estimating the Uncertainty of Cosmological First Order Phase Transitions with Numerical Simulations of Bubble Nucleation
Estimating the Uncertainty of Cosmological First Order Phase Transitions with Numerical Simulations of Bubble Nucleation Open
In order to study the validity of analytical formulas used in the calculation of characteristic physical quantities related to vacuum bubbles, we conduct several numerical simulations of bubble kinematics in the context of cosmological fir…
View article: Search for Dark-Matter-Nucleon Interactions with a Dark Mediator in PandaX-4T
Search for Dark-Matter-Nucleon Interactions with a Dark Mediator in PandaX-4T Open
We report results of a search for dark-matter-nucleon interactions via a dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With the ionization-signal-only data and utilizing the Migdal effect, we set…
View article: Search for Light Dark Matter from the Atmosphere in PandaX-4T
Search for Light Dark Matter from the Atmosphere in PandaX-4T Open
We report a search for light dark matter produced through the cascading decay of η mesons, which are created as a result of inelastic collisions between cosmic rays and Earth's atmosphere. We introduce a new and general framework, publicly…
View article: Second-order cosmological perturbations produced by scalar-scalar coupling during inflation stage
Second-order cosmological perturbations produced by scalar-scalar coupling during inflation stage Open
We study the perturbations up to the 2nd-order for a power-law inflation driven by a scalar field in synchronous coordinates. We present the 1st-order solutions, and analytically solve the 2nd-order perturbed Einstein equation and scalar f…
View article: Implications of Nano-Hertz Gravitational Waves on Electroweak Phase Transition in the Singlet Dark Matter Model
Implications of Nano-Hertz Gravitational Waves on Electroweak Phase Transition in the Singlet Dark Matter Model Open
Inspired by the recent evidences of nano-Hertz stochastic gravitational waves observed by the pulsar timing array collaborations, we explore their implied supercooled electroweak phase transition in the singlet extension of the Standard Mo…
View article: Search for Light Dark Matter with Ionization Signals in the PandaX-4T Experiment
Search for Light Dark Matter with Ionization Signals in the PandaX-4T Experiment Open
We report the search results of light dark matter through its interactions with shell electrons and nuclei, using the commissioning data from the PandaX-4T liquid xenon detector. Low energy events are selected to have an ionization-only si…
View article: EasyScan_HEP: a tool for connecting programs to scan the parameter space of physics models
EasyScan_HEP: a tool for connecting programs to scan the parameter space of physics models Open
We present an application, EasyScan_HEP, for connecting programs to scan the parameter space of High Energy Physics (HEP) models using various sampling algorithms. We develop EasyScan_HEP according to the principle of flexibility and usabi…
View article: A Concise Review on Some Higgs-Related New Physics Models in Light of Current Experiments
A Concise Review on Some Higgs-Related New Physics Models in Light of Current Experiments Open
The Higgs boson may serve as a portal to new physics beyond the standard model (BSM), which is implied by the theoretical naturalness or experimental anomalies. This review aims to briefly survey some typical Higgs-related BSM models. Firs…
View article: Supplementary Data: Collider constraints on electroweakinos in the presence of a light gravitino
Supplementary Data: Collider constraints on electroweakinos in the presence of a light gravitino Open
This record contains the full dataset generated for the study "Collider constraints on electroweakinos in the presence of a light gravitino" by the GAMBIT Collaboration. The record also includes a GAMBIT configuration file and example scri…
View article: Supplementary Data: Collider constraints on electroweakinos in the presence of a light gravitino
Supplementary Data: Collider constraints on electroweakinos in the presence of a light gravitino Open
This record contains the full dataset generated for the study "Collider constraints on electroweakinos in the presence of a light gravitino" by the GAMBIT Collaboration. The record also includes a GAMBIT configuration file and example scri…
View article: A concise review on some Higgs-related new physics models in light of current experiments
A concise review on some Higgs-related new physics models in light of current experiments Open
Higgs boson may serve as a portal to new physics beyond the standard model (BSM) which is implied by theoretical naturalness or experimental anomalies. In this note we briefly survey some Higgs-related BSM physics models, including the low…
View article: Dilution of dark matter relic density in singlet extension models
Dilution of dark matter relic density in singlet extension models Open
A bstract We study the dilution of dark matter (DM) relic density caused by the electroweak first-order phase transition (FOPT) in the singlet extension models, including the singlet extension of the standard model (xSM), of the two-Higgs-…