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Search: authors:"Ligong Bian"

5 papers found.
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A new insight into the phase transition in the early Universe with two Higgs doublets

Abstract We study the electroweak phase transition in the alignment limit of the CP-conserving two-Higgs-doublet model (2HDM) of Type I and Type II. The effective potential is evaluated at one-loop, where the thermal potential includes Daisy corrections and is reliably approximated by means of a sum of Bessel functions. Both 1-stage and 2-stage electroweak phase transitions are...

B-meson anomalies and Higgs physics in flavored \(U(1)'\) model

We consider a simple extension of the Standard Model with flavor-dependent \(U(1)'\), that has been proposed to explain some of B-meson anomalies recently reported at LHCb. The \(U(1)'\) charge is chosen as a linear combination of anomaly-free \(B_3-L_3\) and \(L_\mu -L_\tau \). In this model, the flavor structure in the SM is restricted due to flavor-dependent \(U(1)'\) charges...

Higgs pair productions in the CP-violating two-Higgs-doublet model

In this work, we study the SM-like Higgs pair productions in the framework of the general CP-violating two-Higgs-doublet model. Several constraints are imposed to the model sequentially, including the SM-like Higgs boson signal fits, the precise measurements of the electric dipole moments, the perturbative unitarity and stability bounds to the Higgs potential, and the most recent...

Prospects for triple gauge coupling measurements at future lepton colliders and the 14 TeV LHC

The W W production is the primary channel to directly probe the triple gauge couplings. We first analyze the e + e − → W + W − process at the future lepton collider, China’s proposed Circular Electron-Positron Collider (CEPC). We use the five kinematical angles in this process to constrain the anomalous triple gauge couplings and relevant dimension six operators at the CEPC up to...

Two component dark matter with multi-Higgs portals

With the assistance of two extra groups, i.e., an extra hidden gauge group SU(2) D and a global U(1) group, we propose a two component dark matter (DM) model. After the symmetry SU(2) D × U(1) being broken, we obtain both the vector and scalar DM candidates. The two DM candidates communicate with the standard model (SM) via three Higgs as multi-Higgs portals. The three Higgs are...