We analyze the collider signatures of the real singlet extension of the Standard Model in regions consistent with a strong first-order electroweak phase transition and a singlet-like scalar heavier than the Standard Model-like Higgs. We study the prospects for observing these processes at the LHC and a future 100 TeV pp collider, focusing particularly on double singlet production. We also...
To probe the electroweak phase transition, cosmologists are looking forward to the next generation of high energy collider experiments, which will likely be electron-positron colliders that sit at the threshold to produce a Z-boson and Higgs boson pair. These Higgs factories will furnish precisions measurements of the Higgs’s couplings to other Standard Model particles. In the talk, I will...
The Higgs potential consists of an unexplored territory in which the electroweak symmetry breaking is triggered, and it is moreover directly related to the nature of the electroweak phase transition. Measuring the Higgs boson trilinear and quartic couplings, or getting equivalently information on the exact shape of the Higgs potential, is therefore an essential task. However, direct...
We derive the electroweak (EW) collinear splitting functions for the Standard Model, including the massive fermions, gauge bosons and the Higgs boson. We first present the splitting functions in the limit of unbroken SU(2)_L × U(1)_Y and discuss their general features in the collinear and soft-collinear regimes. These are the leading contributions at a splitting scale (k_T) far above the EW...
In this talk, we discuss the new physics implication of Higgs Precision Measurements at the future electron-positron Higgs factories, including the Chinese proposal CEPC, the European proposal FCC-ee, as well as the Japanese proposal of ILC. We explored two typical types of new physics models: Two Higgs Double Model (2HDM) as an example of weakly coupled BSM scenarios, and composite Higgs...
We present strategies to search for heavy scalars decaying to top quark pairs. The gluon fusion channel is unsatisfactory due to the interference effect with SM background. We propose to use heavy scalar production in association with one or two top quarks. In the framework of type II two Higgs doublet models at low tan_beta(heavy neutral Higgs mainly decaying to top quark pairs), we obtain...
A future \sqrt{s} = 100 TeV proton-proton collider will have a remarkable capacity to discover massive new particles and continue exploring weak scale naturalness. In this work we will study its sensitivity to two stop simplified models as further examples of its potential power: pair production of stops that decay to tops or bottoms and higgsinos; stops that are either pair produced or...
The construction of a photon collider is urged in order to study the properties of the Higgs boson and electroweak symmetry breaking. It has been claimed that the process γγ → QQ ̄(g) could be the major contribution for the background of Higgs production in photon collisions. However, there are also some papers that claim the contribution is not so strong, which means that the photons are...
