International Workshop on Future Linear Colliders, LCWS2024

Searching for Charged Higgs Bosons via e+e−→H+H−→cb¯c¯b at Linear Colliders

10 Jul 2024, 11:00

20m

Koshiba Hall (Science building n.1)

Oral presentation (in person) Higgs, Electro-Weak Higgs, Electroweak

Speaker

George W.-S. Hou (National Taiwan University)

Description

We study a search for the charged Higgs boson via $e^{+}{e}^{-}\to H^{+}{H}^{-}\to c\overline{b}\overline{c}b$ at the 500 GeV ILC. In a general two Higgs doublet model without $Z_2$ symmetry, extra Yukawa couplings ${\rho }_{tc}$ and ${\rho }_{tt}$ can drive electroweak baryogenesis, but searches at the HL-LHC may still go empty-handed if the couplings are relatively weak. Taking $m_{H^{+}}\simeq m_H\simeq$ $m_A\simeq 200$ GeV, with ${\rho }_{tc},{\rho }_{tt}\sim 0.1$ and no $h(125)$-$H$ mixing, $H^{+}\to c\overline{b}$ decay is dominant, and the $c\overline{b}\overline{c}b$ final state is likely overwhelmed by QCD background at the LHC. We show that the electroweak production of $H^{+}{H}^{-}$ at the ILC can be discovered with integrated luminosity of 1 ab${}^{-1}$. Furthermore, we show that $m_{H^{+}}$ can be extracted by requiring the two pairs of $b$ and light jets be roughly equal in mass, without assuming the mass value. Thus, ILC can probe low mass Higgs bosons in multijet final states to complement HL-LHC in the future.

Presentation materials

e+e- to H+H- to cbcb @ ILC500.pdf

e+e- to H+H- to cbcb @ ILC500.pptx