arXiv subjects

Yi-Song Lu

Publications and source records attributed to Yi-Song Lu.

3 recordsLinked to original sources

arXiv2026

Charged Higgs Search at Future Neutrino Telescope and Higgs Factory

We investigate the discovery potential of the charged Higgs boson at future lepton colliders and neutrino telescopes within two simplified benchmark scenarios with universal Yukawa couplings. We demonstrate that both the muon-track and cascade events at neutrino telescopes can be exploited to search for or constrain the charged Higgs boson through resonant neutrino scattering process, and we compare the sensitivities obtained under different astrophysical neutrino flux models. We study the effect of the detector volume of neutrino telescopes on the discovery potential of the charged Higgs boson. We study the signal of charged Higgs boson at future lepton colliders over different kinematic regimes using optimized reconstruction strategies. We compare the discovery potential of the two experimental approaches over the relevant parameter space and find that future lepton colliders generally provide better sensitivity in most of the parameter space, while neutrino telescopes with very large detector volume can offer competitive and complementary sensitivity in the heavy-mass region of the charged Higgs boson.

hep-ph↗

arXiv2026

Lyman-$\alpha$ Forest Constraint on Dark Matter from Dark Sector Decay

By exploiting small-scale structure formation probed by Lyman-$\alpha$ forest observations, we study constraints on a model of dark matter from dark sector decay. We compute the phase space distribution of the dark matter and the linear matter power spectrum. We map the non-thermal dark matter distribution in this dark matter model to an approximate thermal warm dark matter distribution, and use this approximation to obtain a constraint from the Lyman-$\alpha$ forest observation. We combine the latest Lyman-$\alpha$ forest bounds with the constraint from the Big Bang Nucleosynthesis. As these two probes offer highly complementary constraints, we impose strong limits on sub-GeV dark matter. Consequently, masses lighter than $\sim 10^{-1}$ GeV are excluded, thereby significantly limiting the allowed parameter space. More broadly, our findings demonstrate the utility of small-scale structure observations in testing non-thermal dark matter paradigms, offering valuable insights for exploring a wider class of late-time decay models.

hep-ph↗

arXiv2022

Study of $HZZ$ anomalous couplings by angular differential cross sections

Being one of the golden channels for precise measurement of Higgs properties, the process $gg \to H\to ZZ \rightarrow 4l$ provides an opportunity to detect the anomalous $HZZ$ couplings in searching of new physics beyond the Standard Model. In this paper, we adopt the method of spinor helicity amplitudes to calculate the amplitudes of process $gg \to H \to ZZ \rightarrow 2e2μ$ at the LHC in the frame of the effective dimension-6 operators. Signal processes of CP-even and CP-odd anomalous $HVV$ couplings in Higgs on/off-shell region and their interference are simulated by using the package MCFM. The most sensitive angle $ϕ$ to extract the CP violated $HZZ$ coupling coefficients, which is defined as the angle between two $Z$ decay planes in Higgs rest frame, is found for experimental measurements.

hep-ph↗