Abstract
We present an analysis with improved sensitivity to the light charged Higgs (\(m_{H^{+}} < m_{t}-m_{b}\)) searches in the top quark decays t→bH +→b(τ + ν τ )+c.c. in the \(t\bar{t}\) and single \(t/\bar{t}\) production processes at the LHC. In the Minimal Supersymmetric Standard Model (MSSM), one anticipates the branching ratio \({\mathcal{B}} (H^{+} \to\tau^{+}\nu_{\tau})\simeq1\) over almost the entire allowed \(\tan\beta\) range. Noting that the τ + arising from the decay H +→τ + ν τ are predominantly right-polarized, as opposed to the τ + from the dominant background W +→τ + ν τ , which are left-polarized, a number of H +/W +→τ + ν τ discriminators have been proposed and studied in the literature. We consider hadronic decays of the τ ±, concentrating on the dominant one-prong decay channel τ ±→ρ ± ν τ . The energy and p T of the charged prongs normalised to the corresponding quantities of the ρ ± are convenient variables which serve as τ ± polariser. We use the distributions in these variables and several other kinematic quantities to train a boosted decision tree (BDT). Using the BDT classifier, and a variant of it called BDTD, which makes use of decorrelated variables, we have calculated the BDT(D)-response functions to estimate the signal efficiency vs. the rejection of the background. We argue that this chain of analysis has a high sensitivity to light charged Higgs searches up to a mass of 150 GeV in the decays t→bH + (and charge conjugate) at the LHC. For the case of single top production, we also study the transverse mass of the system determined using Lagrange multipliers.
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Ali, A., Barreiro, F. & Llorente, J. Improved sensitivity to charged Higgs searches in top quark decays t→bH +→b(τ + ν τ ) at the LHC using τ polarisation and multivariate techniques. Eur. Phys. J. C 71, 1737 (2011). https://doi.org/10.1140/epjc/s10052-011-1737-8
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DOI: https://doi.org/10.1140/epjc/s10052-011-1737-8