ILC Workshop on Potential Experiments (ILCX2021)

Searching for Charged via $e^+ e^- \to H^+ H^- \to \bar{b} c b\bar{c}$ 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 $e^+ e^-→H^+ H^-→b ̅cbc ̅$ 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 $ab^{-1}$. 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