Conveners
Higgs I
- William Shepherd (Sam Houston State University)
The KOTO experiment has recently performed a search for neutral Kaons decaying into neutral pions and a pair of neutrinos. Three events were observed in the KOTO signal region, with an expected background of about 0.05. Since no clear signal of systematic errors have been found, the excess of events in the decay $K_{L}\rightarrow\pi^0\nu\bar{\nu}$ is quite intriguing. One possibility to...
The KOTO experiment recently presented an excess of events in their search for the rare Standard Model (SM) process $K_L \to \pi^0 \nu\bar{\nu}$, well above the combined SM signal and background prediction. In this talk, I will show how an excess of events may be explained by weakly-coupled scalar particles produced in Kaon decays that escape KOTO undetected. I will review two concrete...
Many new physics scenarios beyond the Standard Model (BSM) often necessitate the existence of new neutral and/or charged scalar fields, which might couple to the SM charged leptons and thus give some BSM signals while evading all existing constraints. We show that future lepton colliders provide a clean environment to probe these BSM including some interesting lepton flavor violating (LFV)...
The Georgi-Machacek (GM) model extends the Standard Model Higgs sector with weak isospin triplets in such a way as to preserve the $\rho$ parameter at tree level. We evaluate the experimental constraints on the GM model from direct searches for new Higgs bosons and from measurements of the 125 GeV Higgs. A large number of constraints are implemented by interfacing the public codes HiggsBounds...
We study a three Higgs doublet model where one doublet is inert and the other two doublets are active. Flavor changing neutral currents are avoided at tree-level by imposing a softly broken $𝑍_2$ symmetry and we consider type I and type II Yukawa structures. The lightest inert scalar is a viable Dark Matter (DM) candidate. A numerical scan of the free parameters is performed taking into...
The exotic decay modes of non-Standard Model (SM) Higgs bosons are efficient in probing the hierarchical Two Higgs Doublet Models (2HDM). In particular, the decay mode $H^\pm\to HW^\pm$ serves as a powerful channel in searching for the charged Higgses. In our study, we analyzed the reach for $H^\pm\to HW^\pm \to t\bar{t}W$ at a 100 TeV $pp$ collider, and showed that it extends the reach of...
A successful electro-weak baryongenesis calls for a strong first order electro-weak phase transition (SFOEWPT), which is unavailable in the Standard Model (SM). Some degree of modification on Higgs potential at electro-weak temperature is required to develop an energy barrier, and the property of Higgs at zero temperature is also changed accordingly. In this work we study the realization of...
To explain the baryon asymmetry of the Universe, we extend the
Standard Model (SM) with two additional Higgs doublets with small vacuum expectation values. The additional Higgs fields interact with SM fermions through complex Yukawa couplings, leading to new sources of CP violation. We propose a simple flavor model with $\mathcal{O}(1)$ or less Yukawa couplings for quarks and charged...
