Boosting the charged Higgs search prospects using jet substructure at the LHC

Abstract

Charged Higgs bosons are predicted in variety of theoretically well-motivated new physics models with extended Higgs sectors. In this study, we focus on a type-II two Higgs doublet model (2HDM-II) and consider a heavy charged Higgs with its mass ranging from 500 GeV to 1 TeV as dictated by the b → sγ constraints which render M H ± > 480 GeV. We study the dominant production mode H ± t associated production with H ± → W ± A being the dominant decay channel when the pseudoscalar A is considerably lighter. For such a heavy charged Higgs, both the decay products W ± and A are relatively boosted. In such a scenario, we apply the jet substructure analysis of tagging the fat pseudoscalar and W jets in order to eliminate the standard model background efficiently. We perform a detailed detector simulation for the signal and background processes at the 14 TeV LHC. We introduce various kinematical cuts to determine the signal significance for a number of benchmark points with charged Higgs boson mass from 500 GeV to 1 TeV in the W ± A decay channel. Finally we perform a multivariate analysis utilizing a boosted decision tree algorithm to optimize these significances.

High-scale validity of a two-Higgs-doublet scenario: Predicting collider signals

“…In this work, we aim to investigate the observability of a 2HDM at the present [12][13][14][15][16][17][18][19][20] and upcoming colliders [21,22] within the parameter region that allows for high-scale validity (including both vacuum stability and perturbativity). This could turn challenging since the search prospects could be severely inhibited by the constraints.…”

Heavy charged scalars from $$ c\overline{s} $$ fusion: a generic search strategy applied to a 3HDM with U(1) × U(1) family symmetry

“…In these searches, they mainly focus in the TeV-scale W mass and the analyses are done using the cut-based techniques. A cutbased analysis may not perform well in our case, especially for low m H ± region due to the presence of a large SM background [43,44]. Therefore, we choose to use a MVA to obtain a better signal-to-background discrimination which usually leads to a better significance than a cut-based analysis.…”

Heavy charged scalars from $c\bar{s}$ fusion: A generic search strategy applied to a 3HDM with $\mathrm{U}(1) \times \mathrm{U}(1)$ family symmetry

“…In these searches, they mainly focus in the TeV-scale W mass and the analyses are done using the cut-based techniques. A cut-based analysis may not perform well in our case, especially for low m H ± region due to the presence of a large SM background [43,44]. Therefore, we choose to use a MVA to obtain a better signal-to-background discrimination which usually leads to a better significance than a cut-based analysis.…”