ILC Workshop on Potential Experiments (ILCX2021)

Searching for Charged via e+e−→H+H−→b¯cbc¯ at Linear colliders

27 Oct 2021, 10:00

20m

Room #2 (Zoom Meeting ID: 823 6921 2312)

Oral presentation using Zoom Session H: BSM particle production F&H-1: Higgs properties & BSM particle production

Speaker

Rishabh Jain (National Taiwan University)

Description

We present a search for the charged Higgs boson via $e^{+}{e}^{-}\to H^{+}{H}^{-}\to b̅cbc̅$ at the 500 GeV ILC. In a general two Higgs doublet model without $Z_2$ symmetry, extra Yukawa couplings such as ${\rho }_{tc}$ and ${\rho }_{tt}$ can drive baryogenesis, but searches at the HL-LHC may still come away empty-handed. In this report, we take $m_{(}{H}^{+})=m_H=m_A=200$ GeV with ${\rho }_{tc}={\rho }_{tt}=0.1$, and no h(125)-H mixing. We study the four jet final state with two b-tagged, which would clearly be overwhelmed by QCD background at LHC, but with electroweak production of $H^{+}{H}^{-}$ at ILC, the signal is discoverable. We find that ILC can capture this signature with significance at 20$\sigma$ or better with integrated luminosity of 1 $a{b}^{-1}$. We also show that the mass of H^+ can be recovered by requiring the two b and light jet pairs be approximately equal in mass, without assuming the mass. Thus, ILC can probe low mass Higgs bosons in multijet final states to compliment HL-LHC in the future.

Presentation materials

Talk_ILCX2021_RJ.pdf