Publications

With one neutrino flavor still being relativistic today, the resonance of the scattering between incoming DSNB neutrino and cosmic neutrino background can be significantly widened. The distortion of the DSNB spectrum can thus be used to probe a much wider parameter space of neutrino self-interaction. We show that a mediator at eV scale can be probed with the coupling to neutrino as low as $10^{-8}$.

We show that MUonE can also discover thermal relic dark matter using only its nominal experimental setup. Furthermore, our results show that the downstream ECAL plays a key role in rejecting backgrounds for this search, thereby providing strong motivation for the MUonE to keep this component in the final experimental design.

We investigate the cosmological imprints of neutrino-DM-mediator interaction in a model-independent way, including the extra contribution of $N_{\rm eff}$ and the distortion of C$\nu$B. Lyman-$\alpha$ constraint is also discussed. To do this, we implemented a universal approach to solve the time evolution of dark matter in both freeze-in and freeze-out case.

The coupling between an axion-like particle (ALP) and the Higgs boson can potentially enhance the electroweak phase transition to be strongly first order. Local electroweak baryogensis, which has been ruled out for the traditioanl Higgs operator, can be effective for the operator that couples the ALP with various anomalies. This paper investigates such a scenario with various ways to probe.

Space-time parity has been proposed as a solution to the strong CP problem for decades. However, electroweak (-like) baryogenesis from the $SU(2)_R \times U(1)_X \to U(1)_Y$ phase transition has been regarded as difficult. This paper investigates the possibility to realize the electroweak (-like) phase transition in such a phase transition, and discuss the resulting cosmological results.

We demonstrate how to search for dark photons by displaced vertex search at the proposed MUonE experiment in the mass range $10~\mathrm{MeV} \le m_{A’} \le 100~\mathrm{MeV}$ and kinetic mixing parameter $10^{-5} \le \epsilon e \le 10^{-3}$, through the process $\mu^{\pm}, e^- \to \mu^{\pm}, e^-, A’$ followed by $A’\to e^+e^-$.

Axion rotation has been recently proposed to be a possible source of baryogenesis, i.e. ‘axiogenesis’. This mechanism, however, cannot account for the observed number of axion dark matter abundance and baryon asymmetry simultaneously in minimal SM + axion. In this paper, we propose a possibility where axiogenesis can be compatible with axion dark matter.

It has been known the electroweak baryogenesis (EWBG) in the minimal SM is suppressed by the large damping rate of the quark quasiparticle in the thermal plasma, due to the strong QCD interaction. Old literatures proposed a possibility that lepton scattering may be capable of generating enough baryon asymmetry since the damping rate could be much smaller. Is this really the case? This paper proposes a model that mimic the SM quark sector with chiral leptons. We investigate the thermodynamics in detail and concluded that it could be only marginally OK to generate the baryon asymmetry from a lepton sector with CKM-like structure.