通俗演講 Colloquium

Title

Decadal Mission for the New Physics Higgs/Flavor Era - Searching for Extra Higgs Boson Effects in General 2HDM

Speaker

侯維恕講座教授 (國立台灣大學物理系)

Chair Professor George Wei-Shu Hou (Department of physics, National Taiwan University)

Abstract

The LHC has not discovered any New Physics beyond the h(125) boson; new ideas abound for out-of-the-box searches, or EFTs with multi-TeV cutoff. But have we exhausted dim.-4 operators involving sub-TeV particles that are not exotic (i.e. non-XLP)? Having discovered one Higgs doublet, we advocate the existence of a 2nd Higgs doublet with extra Yukawa couplings (g2HDM), i.e. without the usual Z₂ symmetry, where emergent mass-mixing hierarchies and alignment have hidden their effects very well so far, such as t → ch. O(1) Higgs quartic couplings can induce first order electroweak phase transition, as well as imply sub-TeV H, A, H^± spectrum. Extra top Yukawa couplings such as ρ_tt & ρ_tc at O(1) can drive EW baryogenesis, while |ρ_ee/ρ_tt| ∝ λ_e/λ_t, the ratio of usual electron and top Yukawa couplings, can tame electron EDM. Finding the extra Higgs bosons via cg → tH/A → ttc̄, ttt̄ and cg → bH⁺ → btb̄ processes at the LHC and reopen t → ch search, plus pushing the flavor frontier to break the flavor code, would usher in a new Higgs/flavor era. A new physics scale at 10–20 TeV, possibly related to the Landau pole of the scalar sector (due to O(1) quartics), may emerge.
N.B. “Decadal Mission” title based on 2109.02557 (CJP’22); Second title based on https://www.mdpi.com/2073-8994/16/8/1013

Poster Download:

Language

演講語言 (Language): in English

Hosted by

張元翰 特聘研究員兼所長
Chang, Yuan-Hann / Distinguished Research Fellow & Director