The tiny neutrino masses are most naturally explained by seesaw mechanism through singlet right-handed neutrinos, which can further explain the matter-antimatter asymmetry in the Universe. In this work, we propose a new approach to study cosmological signatures of neutrino seesaw through the interaction between inflaton and right-handed neutrinos, which respects the shift symmetry. In our...
This talk will present the status and plans of Chinese muon facilities, and possible new physics search programs proposed.
I will talk about several proposals, which aim to uncover lepton flavor mixing in the right-handed sector through processes at various colliders and in low-energy experiments.
We developed an algorithm to compute the oscillation and decay of a sterile neutrino generated at a collider in the case that a crossing-width term exist. We also looked into the hidden structure of the S-matrix to extract the oscillating informations.
Long-lived particles (LLPs) originating from decays of Standard-Model-like or beyond-the-Standard-Model Higgs bosons are often featured with signatures of displaced vertices (DVs) and jets at colliders. In this work, we show that a recent ATLAS search for DVs plus jets, with its recast implementation, can efficiently place bounds on such hadronically or semileptonically decaying LLPs. In...
In this talk I will present a new mechanism that can gives rise to the successful baryogensis via Leptogenesis.
I will discuss how to measure the gravitational wave spectrum from cosmological first order phase transitions, in particular the Electroweak phase transitions, and how to then predict observables which are important but difficult to measure by other experiments, like the Higgs self-couplings.
Heavy neutral leptons (HNLs) are constrained by requirements of Big Bang Nucleosynthesis (BBN) as their decays significantly impact the formation of the primordial elements. We propose here a model where the primary decay channel for the HNLs is to an axion-like particle (ALP) and a neutrino. Consequently, HNLs can decay earlier and evade the BBN bound for lower masses, provided the ALPs...
Leptophilic axion-like particles (ALPs) exhibit rich phenomenology, focusing exclusively on interactions between an ALP and Standard Model (SM) leptons. Through integration by parts, it is shown that both the three-point interaction, $a\bar\ell\ell$, and the four-point interaction, $a\ell^-\nu W^+$, play significant roles, making the flavor portal particularly compelling. For ALPs with masses...
We consider the lepton flavor violation (LFV) processes generated at loop-level in the left-right symmetric model (LRSM). We pay special attention to the parameter space in which a light exotic CP-even scalar is produced in beam dump experiments or astrophysical processes. When the light scalar behaves as a long-lived particle, various current searches and prospects for future facilities can...
