Search for Light $H^+$ via $e^+e^- \to H^+H^- \to c\bar b\bar cb$ @ ILC500

TL;DR

This paper explores the potential to detect light charged Higgs bosons at ILC500 through specific decay channels, highlighting the advantages of a general two Higgs doublet model and recent LHC search efforts.

Contribution

It proposes a novel search strategy for light $H^+$ at ILC500 without relying on $c$-tagging, within the context of a general two Higgs doublet model allowing extra Yukawa couplings.

Findings

Light $H^+$ can be reconstructed at ILC500 without $c$-tagging.

The study demonstrates the feasibility of detecting $H^+$ via $e^+e^- o H^+H^- o car bar cb$.

The paper discusses recent LHC search efforts for $pp o bH^+ o btar b$.

Abstract

Our current {\it impasse}: no new physics seen beyond the $h(125)$ boson. We advocate the {\it general} two Higgs doublet model without $Z_2$ symmetry, allowing extra Yukawa couplings, where we present 5 clear merits. We report on the search effort at LHC for $pp \to tt\bar c$, then on the new effort of $pp \to bH^+ \to bt\bar b$ search for $H^+$, and comment on our \underline{\bf Decadal Mission} program in Taiwan. Finally, we turn to the $e^+e^- \to H^+H^- \to c\bar b\bar cb$ program at ILC500 as a {\it what-if} situation at the LHC, demonstrating light $H^+$ reconstruction without $c$-tagging. We then end with discussion and conclusion.