Neutral Higgs limits at √s=7 TeV using the channel ττ

The preprint is available here.

J. High Energy Phys. 05 (2013) 132

arXiv:1304.2591

More detailed information: ANA note 2013-010

Abstract

Limits on the cross-section times branching fraction for neutral Higgs bosons, produced in $pp$ collisions at $\sqrt{s} = 7$ TeV, and decaying to two tau leptons with pseudorapidities between 2.0 and 4.5, are presented. The result is based on a dataset, corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$, collected with the LHCb detector. Candidates are identified by reconstructing final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. A model independent upper limit at the $95\%$ confidence level is set on a neutral Higgs boson cross-section times branching fraction. It varies from 8.6 pb for a Higgs boson mass of 90 GeV to 0.7 pb for a Higgs boson mass of 250 GeV, and is compared to the Standard Model expectation. An upper limit on $\tan\beta$ in the Minimal Supersymmetric Model is set in the $m_{h^0}^\mathrm{max}$ scenario. It ranges from 34 for a CP-odd Higgs boson mass of 90 GeV to 70 for a pseudo-scalar Higgs boson mass of 140 GeV.

Figures

Caption Figure
(Fig.1a.eps, Fig.1a.pdf, Fig.1a.png) Invariant mass distributions for (a) \begin{displaymath}\tau_\mu\tau_\mu\end{displaymath}, (b) $\tau_\mu\tau_e$, (c) $\tau_e\tau_\mu$, (d) $\tau_\mu\tau_h$, (e) $\tau_e\tau_h$, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1a.png
(Fig.1b.eps, Fig.1b.pdf, Fig.1b.png) Invariant mass distributions for (a) $\tau_\mu\tau_\mu$, (b) \begin{displaymath}\tau_\mu\tau_e\end{displaymath}, (c) $\tau_e\tau_\mu$, (d) $\tau_\mu\tau_h$, (e) $\tau_e\tau_h$, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1b.png
(Fig.1c.eps, Fig.1c.pdf, Fig.1c.png) Invariant mass distributions for (a) $\tau_\mu\tau_\mu$, (b) $\tau_\mu\tau_e$, (c) \begin{displaymath}\tau_e\tau_\mu\end{displaymath}, (d) $\tau_\mu\tau_h$, (e) $\tau_e\tau_h$, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1c.png
(Fig.1d.eps, Fig.1d.pdf, Fig.1d.png) Invariant mass distributions for (a) $\tau_\mu\tau_\mu$, (b) $\tau_\mu\tau_e$, (c) $\tau_e\tau_\mu$, (d) \begin{displaymath}\tau_\mu\tau_h\end{displaymath}, (e) $\tau_e\tau_h$, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1d.png
(Fig.1e.eps, Fig.1e.pdf, Fig.1e.png) Invariant mass distributions for (a) $\tau_\mu\tau_\mu$, (b) $\tau_\mu\tau_e$, (c) $\tau_e\tau_\mu$, (d) $\tau_\mu\tau_h$, (e) \begin{displaymath}\tau_e\tau_h\end{displaymath}, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1e.png
(Fig.1f.eps, Fig.1f.pdf, Fig.1f.png) Invariant mass distributions for (a) $\tau_\mu\tau_\mu$, (b) $\tau_\mu\tau_e$, (c) $\tau_e\tau_\mu$, (d) $\tau_\mu\tau_h$, (e) $\tau_e\tau_h$, and (f) all candidates. The $Z \rightarrow \tau\tau$ background (solid red) is normalised to the theoretical expectation. The QCD (horizontal green), electroweak (vertical blue), and $Z$ (solid cyan) backgrounds are estimated from data. The $t\bar{t}$ (vertical orange) and $WW$ (horizontal magenta) backgrounds are estimated from simulation and generally not visible. The contribution that would be expected from an MSSM signal for $M_{A^0} = 125$ GeV and $\tan\beta = 60$ is shown in solid green. Fig.1f.png
(Fig.2a.eps, Fig.2a.pdf, Fig.2a.png) Model independent combined limit on cross-section by branching fraction for a Higgs boson decaying to two tau leptons at $95\%~\mathrm{CL_s}$ as a function of $M_{\Phi^0}$ is given on the left. The background only expected limit (dashed red) and $\pm1\sigma$ (green) and $\pm2\sigma$ (yellow) bands are compared with the observed limit (solid black) and the expected SM theory (dotted black) with uncertainty (grey). The combined MSSM $95\%~\mathrm{CL_s}$ upper limit on $\tan\beta$ as a function of $M_{A^0}$ is given on the right and compared to ATLAS (dotted maroon and dot-dashed magenta), CMS (dot-dot-dashed blue and dot-dot-dot-dashed cyan), and LEP (hatched orange) results. Fig.2a.png
(Fig.2b.eps, Fig.2b.pdf, Fig.2b.png) Model independent combined limit on cross-section by branching fraction for a Higgs boson decaying to two tau leptons at $95\%~\mathrm{CL_s}$ as a function of $M_{\Phi^0}$ is given on the left. The background only expected limit (dashed red) and $\pm1\sigma$ (green) and $\pm2\sigma$ (yellow) bands are compared with the observed limit (solid black) and the expected SM theory (dotted black) with uncertainty (grey). The combined MSSM $95\%~\mathrm{CL_s}$ upper limit on $\tan\beta$ as a function of $M_{A^0}$ is given on the right and compared to ATLAS (dotted maroon and dot-dashed magenta), CMS (dot-dot-dashed blue and dot-dot-dot-dashed cyan), and LEP (hatched orange) results. Fig.2b.png
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