Search for Higgs boson production in dilepton and missing energy final states with 5.4 fb-1 of p-pbar collisions at sqrt(s) =1.96 TeV

Abstract

A search for the standard model Higgs boson is presented using events with two charged leptons and large missing transverse energy selected from 5.4 fb-1 of integrated luminosity in p-pbar collisions at sqrt(s)=1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. No significant excess of events above background predictions is found, and observed (expected) upper limits at 95% confidence level on the rate of Higgs boson production are derived that are a factor of 1.55 (1.36) above the predicted standard model cross section at Higgs boson mass of 165 GeV.

Figures (17)

• Figure 1: (color online) (a) The dilepton invariant mass after preselection; (b) the $\Delta\phi(\ell,\ell)$ angle after final selection; and (c) the neural network output after final selection. The signal is shown for $m_H$=165 GeV. The systematic uncertainty is shown after fitting (see text for details).
• Figure 1: The $\Delta\phi(\ell,\ell)$ angle between the two leptons after all final selection requirements except for the selection on $\Delta\phi(\ell,\ell)$ in linear (a) and logarithmic (b) scale for the combination of $e^+e^-$, $\mu^+\mu^-$, and $e^{\pm}\mu^{\mp}$ channels. The signal is shown for $m_H$=165 GeV and is scaled to the SM prediction for the combination of Higgs boson production from gluon fusion, vector boson fusion, and associated production. The systematic uncertainty is shown after fitting.
• Figure 2: (color online) (a) Data after subtracting the fitted background (points) and SM signal expectation (filled histogram) as a function of the NN output for $m_H$=165 GeV. Also shown is the $\pm1$ standard deviation (s.d.) band on the total background after fitting. (b) Observed LLR (solid line), expected LLR for background-only hypothesis (dashed line), and signal + background hypothesis (dotted line). (c) Upper limit on Higgs boson production cross section at 95% C.L. expressed as a ratio to the SM cross section. The one and two s.d. bands around the curve corresponding to the background-only hypothesis are also shown.
• Figure 2: The $E\slash_T$ after all selections except for the selection on $E\slash_T$ in linear (a) and logarithmic (b) scale for the combination of $e^+e^-$, $\mu^+\mu^-$, and $e^{\pm}\mu^{\mp}$ channels. The signal is shown for $m_H$=165 GeV and is scaled to the SM prediction for the combination of Higgs boson production from gluon fusion, vector boson fusion, and associated production. The systematic uncertainty is shown after fitting.
• Figure 3: The $E\slash_T^{\rm Sc}$ after all selections except for the selection on $E\slash_T^{\rm Sc}$ in linear (a) and logarithmic (b) scale for the combination of $e^+e^-$, and $e^{\pm}\mu^{\mp}$ channels. The signal is shown for $m_H$=165 GeV and is scaled to the SM prediction for the combination of Higgs boson production from gluon fusion, vector boson fusion, and associated production. The systematic uncertainty is shown after fitting.