Detection of heavy charged Higgs bosons in $e^{+}{e}^{-}\to t\bar{b}{H}^{-}$ production at future Linear Colliders

Abstract

Heavy charged Higgs bosons ($H^{\pm }$) of a Type II 2-Higgs Doublet Model (2HDM) can be detected at future electron-positron Linear Colliders (LCs) even when their mass is larger than half the collider energy. The single Higgs mode $e^{+}{e}^{-}\to t\bar{b}{H}^{-}+c.c.\to 4b+\mathrm{j}\mathrm{j}+\ell +p_T^{\mathrm{miss}}$ (where j represents a jet and with $\ell =e,\mu$) contributes to extend the discovery reach of $H^{\pm }$ states into the mass region $M_{H^\pm}\gsim \sqrt s/2$, where the well studied pair production channel $e^{+}{e}^{-}\to H^{-}{H}^{+}$ is no longer available. With a technique that allows one to reconstruct the neutrino four-momentum in the decay $t\to b{W}^{+}\to b{\ell }^{+}\nu$, one can suppress the initially overwhelming main irreducible background due to $e^{+}{e}^{-}\to t\bar{t}b\bar{b}$ (via a gluon splitting into $b\bar{b}$ pairs) to a negligible level. However, for currently foreseen luminosities, one can establish a statistically significant $H^{\pm }$ signal only over a rather limited mass region, of 20 GeV or so, beyond $M_{H^{\pm }}\approx \sqrt{s}/2$, for very large or very small values of $\tan \beta$ and provided high $b$-tagging efficiency can be achieved.

arXiv comment18 pages, latex, 8 figures (version to appear in EPJC)

References in corpus (10)

• Automatic Generation of Tree Level Helicity Amplitudes
• Implementation of supersymmetric processes in the HERWIG event generator
• Heavy Charged Higgs Signals at the LHC
• Contributions of below--threshold decays to $\mathcal{MSSM}$ Higgs branching ratios
• Possible enhancement of the $e^{+}{e}^{-}\to H^{\pm }{W}^{\mp }$ cross section in the two-Higgs-doublet model
• Associated production of H^{\pm} and W^{\mp} in high-energy e+e- collisions in the Minimal Supersymmetric Standard Model
• The Metropolis algorithm for on-shell four-momentum phase space
• Heavy charged Higgs boson production at next generation $\gamma \gamma$ colliders
• Heavy charged Higgs boson production at next generation $e^{\pm }\gamma$ colliders
• e+e- --> nu nu-bar A in the two-Higgs-doublet model

Cited by in corpus (6)

• Phenomenology of a Higgs triplet model at future $e^{+}{e}^{-}$ colliders
• Pair production of charged Higgs bosons in the Left-Right Twin Higgs model at the ILC and LHC
• On MSSM charged Higgs boson production in association with an electroweak W boson at electron positron colliders
• Charged Higgs Pair Production in a General Two Higgs Doublet Model at $e^{+}{e}^{-}$ and ${\mu }^{+}{\mu }^{-}$ Linear Colliders
• Charged Higgs Detection in the $\tau \nu$ Decay Mode at Future Linear Colliders
• Observability of Charged Higgs through Triple or Double Higgs Production in a General Two Higgs Doublet Model at an e+e- Linear Collider