Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at sqrt(s) = 7 TeV

TL;DR

A search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy of √s=7 TeV and no significant excess of events above the expected backgrounds is observed.

Abstract

A search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at sqrt(s) = 7 TeV. No significant excess of events above the expected backgrounds is observed in 4.98 inverse femtobarns of data collected with the CMS detector at the Large Hadron Collider. The results are presented in the context of the constrained minimal supersymmetric extension of the standard model and more generically for simplified models. For the simplified models of gluino-gluino and squark-squark production, gluino masses below 1.0 TeV and squark masses below 0.76 TeV are excluded in case the lightest supersymmetric particle mass is below 200 GeV. These results significantly extend previous searches.

Figures (3)

• Figure 1: The (a) $H_{\mathrm{T}}$ and (b) $\slash\mkern-12mu{H}_{\text{T}}$ distributions in the search data samples (circles) compared with histograms showing predictions of the SM background and SUSY signal (LM5, see the text) for events passing the baseline selection. The hatched region indicates the uncertainties on the background predictions. The last bin contains all events above the maximum values of $H_{\mathrm{T}}$ and $\slash\mkern-12mu{H}_{\text{T}}$ in the figures. The ratio of the observed data to the background predictions is also shown.
• Figure 2:
• Figure 3: The observed and expected 95% C.L. upper limits on the (a) $\widetilde{{g}}\xspace\widetilde{{g}}\xspace$ and (b) $\widetilde{{q}}\xspace\widetilde{{q}}\xspace$ cross sections in the $\left(m(\widetilde{{g}}\xspace), m(\widetilde{\chi}^{0}\xspace)\right)$ and $\left(m(\widetilde{{q}}\xspace), m(\widetilde{\chi}^{0}\xspace)\right)$ planes obtained with the simplified model. Also shown are the $\pm1\sigma$ variation in the expected limit and the variation in the observed limit when the signal cross section is varied by its theoretical uncertainties.