Search for Supersymmetry in pp Collisions at √s = 7 TeV in Events with A Lepton, Photon, and Missing Transverse Energy

Abstract

A first search is performed for an excess of events with a photon, isolated lepton, and large missing transverse energy produced in pp collisions at the sqrt(s) = 7 TeV over the standard model expectations. The data sample used corresponds to an integrated luminosity of 35 pb−1 collected with the CMS detector at CERNís Large Hadron Collider. Such events are expected in many scenarios beyond the standard model, in particular in supersymmetry with gauge-mediated breaking, when the lightest charged and neutral gauginos are mass-degenerate. No evidence of such an excess is found and the results are interpreted by placing 95% confidence level limits on the existence of SUSY in the squark-wino mass plane in a benchmark model.

Plots from the PAS and submitted paper

http://arxiv.org/abs/1105.3152
Figure Abbreviated Caption
WinoLGamma.pdf One of possible diagrams for Wino co-NLSP production.
fig_met.pdf The missing ET distribution in the combined and μγ samples. The black points represent the data and the colored histograms show the individual background components. The expectation from example SUSY benchmark point GMC is shown by the red dashed line. The last bin includes overflows.
fig_mt.pdf The transverse mass MT distribution in the combined and μγ samples. The black points represent the data and the colored histograms show the individual background components. The expectation from example SUSY benchmark point GMC is shown by the red dashed line. The last bin includes overflows.
fig_emet_log.pdf The missing ET distribution in the sample. The black points represent the data and the colored histograms show the individual background components. The expectation from example SUSY benchmark point GMC1 is shown by the red dashed line. The last bin includes overflows.
fig_mmet_log.pdf The missing ET distribution in the μγ sample. The black points represent the data and the colored histograms show the individual background components. The expectation from example SUSY benchmark point GMC1 is shown by the red dashed line. The last bin includes overflows.
wgxc_01.pdf The electron ET distribution in the sample for events with the transverse mass above 70 GeV. The black points represent the data and the colored histograms show the individual background components.
wgxc_02.pdf The photon ET distribution in the sample for events with the transverse mass above 70 GeV. The black points represent the data and the colored histograms show the individual background components.
wgxc_05.pdf The electron ET distribution in the μγ sample for events with the transverse mass above 70 GeV. The black points represent the data and the colored histograms show the individual background components.
wgxc_06.pdf The photon ET distribution in the μγ sample for events with the transverse mass above 70 GeV. The black points represent the data and the colored histograms show the individual background components.
msquark_mwino_exclusion_witherr_lumi4_tev_expected.pdf Observed 95% CL lower limits on wino and squark/gluino masses. Shaded band represents the theoretical uncertainty on SUSY cross section.
limit-95.pdf 95% C.L. upper limits on the production cross sections (in pb) as a function of squark/gluino and wino masses.
3d-e.pdf The highest MET event.
xy-e.pdf The highest MET event.
3d-mu.pdf The highest MET μγ event.
xy-mu.pdf The highest MET μγ event.

Tables with results

  • limittable.txt: Data for 95% CL upper limits as a function of M(squark, gluino) and M(wino)
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Topic revision: r8 - 2011-06-14 - YuriGershtein
 
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