Search for a charged Higgs boson in pp collisions at $ \sqrt{s}=8 $ TeV

• Main Author: CMS collaboration (2307 authors)
• Publication Date: 2015
• Other Authors: Hollar, Jonathan, Calpas, Betty, Nayak, Aruna, Bargassa, Pedrame, Beirão Da Cruz E Silva, Cristóvão, Di Francesco, Agostino, Faccioli, Pietro, Ferreira Parracho, Pedro Guilherme, Gallinaro, Michele, Leonardo, Nuno, Lloret Iglesias, Lara, Nguyen, Federico, Rodrigues Antunes, Joao, Seixas, Joao, Toldaiev, Oleksii, Vadruccio, Daniele, Varela, Joao, Vischia, Pietro, David Tinoco Mendes, Andre, Silva, Pedro, Musella, Pasquale, Pela, Joao
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://dx.doi.org/10.1007/JHEP11(2015)018; http://hdl.handle.net/10400.26/26914

A search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 ± 0.5 fb$^{−1}$ collected with the CMS detector in proton-proton collisions at $ \sqrt{s}=8 $ ,TeV. The charged Higgs boson is searched for in top quark decays for m$_{H}$± < m$_{t}$ − m$_{b}$, and in the direct production pp → t(b)H$^{±}$ for m$_{H}$± > m$_{t}$ − m$_{b}$. The H$^{±}$ → τ$^{±}$ ν$_{τ}$ and H$^{±}$ → tb decay modes in the final states τ$_{h}$+jets, μτ$_{h}$, ℓ+jets, and ℓℓ’ (ℓ =e, μ) are considered in the search. No signal is observed and 95% confidence level upper limits are set on the charged Higgs boson production. A model-independent upper limit on the product branching fraction $ \mathrm{\mathcal{B}}\left(\mathrm{t}\to {\mathrm{H}}^{\pm}\mathrm{b}\right)\mathrm{\mathcal{B}}\left({\mathrm{H}}^{\pm}\to {\tau}^{\pm }{\nu}_{\tau}\right)=1.2-0.15\% $ is obtained in the mass range m$_{H}$± = 80–160 GeV, while the upper limit on the cross section times branching fraction $ \sigma \left(\mathrm{pp}\to \mathrm{t}\left(\mathrm{b}\right){\mathrm{H}}^{\pm}\right)\mathrm{\mathcal{B}}\left({\mathrm{H}}^{\pm}\to\ {\tau}^{\pm }{\nu}_{\tau}\right)=0.38-0.025 $ pb is set in the mass range m$_{H}$+ = 180–600 GeV. Here, σ(pp → t(b)H$^{±}$) stands for the cross section sum $ \sigma \left(\mathrm{pp}\to \overline{\mathrm{t}}\left(\mathrm{b}\right){\mathrm{H}}^{+}\right)+\sigma \left(\mathrm{pp}\to \mathrm{t}\left(\overline{\mathrm{b}}\right){\mathrm{H}}^{-}\right) $ . Assuming $ \mathrm{\mathcal{B}}\left({\mathrm{H}}^{\pm}\to \mathrm{t}\mathrm{b}\right)=1 $ , an upper limit on σ(pp → t(b)H$^{±}$) of 2.0–0.13 pb is set for m$_{H}$± = 180–600 GeV. The combination of all considered decay modes and final states is used to set exclusion limits in the m$_{H}$±−tan β parameter space in different MSSM benchmark scenarios.