Search for Supersymmetry in Events with Photons, Jets and Missing Energy

Abstract

This PAS describes two searches for supersymmetry in the a gauge-mediation scenario, with the gravitino as the lightest supersymmetric particle. The data sample corresponds to an integrated luminosity of 1.14~\fbinv recorded by the CMS experiment at the LHC. We compare the missing transverse energy distribution in events containing either at least two photons and at least one hadronic jet, or exactly one photon and at least three jets, to the spectra expected from the standard model processes. No excess of events at high missing transverse energy is observed and upper limits on the signal cross section between 0.015 and 0.2~pb at the 95\% confidence level are determined for a range of squark, gluino, and neutralino masses.

Approved Plots from SUS-11-009 ( click on plot to get .pdf )

Figure Abbreviated Caption
MET_average_1jet.gif MET spectrum of gamma-gamma data compared to combined QCD predictino together with the small EWK background for events with >= 1 jet. The red hatched areas indicate the total background uncertainties. Two example GGM points on either side of our exclusion boundary (msquark-mgluino-mneutralino) in GeV/c^2 are also shown.
/can_limit_bino_mN375_met100_1jet_model1b.gif 95% CL upper limits on the cross section in gluino-squark mass space for a neutralino mass of 375 GeV/c^2.
/can_excl02_bino_mN375_met100_1jet_model1.gif 95% CL exclusion contours in gluino-squark mass space for a neutralino mass of 375 GeV/c^2 from the diphoton analysis. The shaded uncertainty band around the exclusion contour corresponds to the NLO renormalization and PDF uncertainties of the signal cross section.
/Screen_shot_2011-08-20_at_8.35.56_PM.png Total standard model background prediction compared to the number of single photon events, including two GGM benchmark points as examples. (msquark/mgluino/mneutralino) in GeV/c^2
/BinoObsLimitSigCont_3jet.gif 95% CL upper limit in gluino-squark mass space for bino like neutralinos from the single photon analysis.
/BinoExclusionOnlySigCont_3jet.gif 95% CL exclusion contours in gluino-squark mass space for bino like neutralinos from the single photon analysis. The shaded uncertainty band around the exclusion contour corresponds to the NLO renormalization and PDF uncertainties of the signal cross section.
/WinoObsLimitSigCont_3jet.gif 95% CL upper limit in gluino-squark mass space for wino like neutralinos from the single photon analysis.
/WinoExclusionOnlySigCont_3jet.gif 95% CL exclusion contours in gluino-squark mass space for wino like neutralinos from the single photon analysis. The shaded uncertainty band around the exclusion contour corresponds to the NLO renormalization and PDF uncertainties of the signal cross section.

-- DavidMason - 20-Aug-2011

Edit | Attach | Watch | Print version | History: r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r3 - 2011-08-21 - DavidMason
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CMSPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback