Precise determination for properties of the Higgs sector is one of the most important issues to clarify physics beyond the SM. For this purpose, we have developed the numerical tool H-COUP, and its version 1 (1-loop calculation for the Higgs boson couplings) and version 2 (1-loop calculation for the Higgs decay rates) have been published. We give a brief review of H-COUP and show how it works...
Higgs couplings to charged leptons forms an important measurement to understand not only the Standard Model but also physics beyond Standard Models including, multihiggs models , supersymmetric models etc. In the present work, We focus on the complementarity between the direct and indirect measurements in fixing the charged Lepton Yukawa couplings including flavour violating couplings. We...
We consider the next-to-next-to-leading order (NNLO) total cross section of Higgs boson pair production at LHC in the large top quark mass approximation.
At hadron collider, the partonic cross section consists of various initial states such as gluon-gluon, gluon-quark, quark-quark, and we calculated all of them analytically within this approximation.
We found that, in some cases, the...
To generate the baryon asymmetry of the universe, new CP violation sources are needed beyond the Standard Model. We consider a two Higgs doublet model with the CP violation. In this model, the property of the Heavy higgs bosons relevant to the CP phases would be important. We discuss the testability of the model at LHC and ILC.
In Standard Model (SM) Higgs Boson pair production initiated by photons ($\gamma\gamma \to hh$) loop generated process and thereby is very sensitive to any new couplings and particles that may come in loops. Composite Higgs Models (CHMs) provide an alternate mechanism to address the hierarchy problem of SM where Higgs could be a bound state of a strongly interacting sector instead of being an...
In this talk, we will discuss the electroweak first-order phase transition in the Two Higgs Doublet Model. First, we show that an upper bound on the mass of the second Higgs boson can be obtained by combining the sphaleron decoupling condition with perturbative unitarity and vacuum stability. This upper bound is obtained even though the h(125) coupling is standard model-like. Second, we show...
