SUS-12-018:

Abstract

We have performed a search for beyond the standard model physics with photons and missing transverse energy. The data sample corresponds to an integrated luminosity of 4.04~\fbinv of $pp$~collisions at $\sqrt{s}=8~\TeV$, recorded by the CMS experiment at the LHC. We compare the missing transverse energy distribution in events containing either at least two photons plus at least one hadronic jet or at least one photon plus at least two hadronic jets to the spectra expected from standard model processes. No excess of events at high missing transverse energy is observed, and results are interpreted in the context of General Gauge Mediated SUSY with the next to lightest SUSY particle being either a bino and wino-like neutralino. 95\% confidence level upper limits on the signal production cross sections for different composition and decay modes of the SUSY particles are determined for a range of squark and gluino masses.

PAS

* coming soon! *

PAS Plots

Figure Caption
BinoXS.png Figure 1: \MET spectrum of $\gamma\gamma$ data compared to QCD prediction together with the small EWK background for events with at least one jet. The red hatched areas indicate the total background uncertainties. Two example GGM points on either side of our exclusion boundary ($m_{{\tilde{q}}} / m_{\tilde{g}} / m_{\chi0}$ in GeV) are also shown.
BinoXS.png Figure 2a: 95\% C.L. upper limits on the signal cross section (left) and corresponding exclusion contours (right) in gluino-squark mass space for a 375 GeV bino-like neutralino in the diphoton analysis.
BinoXS.png Figure 2b: 95\% C.L. upper limits on the signal cross section (left) and corresponding exclusion contours (right) in gluino-squark mass space for a 375 GeV bino-like neutralino in the diphoton analysis. The shaded uncertainty band around the exclusion contours correspond to the NLO renormalization and PDF uncertainties of the signal cross section.
BinoXS.png Figure 2c: 95\% C.L. upper limits on the signal cross section (left) and corresponding exclusion contours (right) in gluino-squark mass space for a 375 GeV wino-like neutralino in the diphoton analysis.
BinoXS.png Figure 2d: 95\% C.L. upper limits on the signal cross section (left) and corresponding exclusion contours (right) in gluino-squark mass space for a 375 GeV wino-like neutralino in the diphoton analysis. The shaded uncertainty band around the exclusion contours correspond to the NLO renormalization and PDF uncertainties of the signal cross section.
BinoXS.png Figure 3: Total standard model background prediction compared to the number of single-photon events, including two GGM benchmark signal benchmark points as examples where masses ($m_{{\tilde{q}}} / m_{\tilde{g}} / m_{\chi0}$) are given in GeV.
BinoXS.png Figure 4a: 95\% C.L. upper limits on the signal cross section in gluino-squark mass space for a 375 GeV bino-like neutralino for the single photon analysis.
BinoXS.png Figure 4a: 95\% C.L. exclusion contours on the signal cross section in gluino-squark mass space for a 375 GeV bino-like neutralino for the single photon analysis. The shaded uncertainty band around the exclusion contours correspond to the NLO renormalization and PDF uncertainties of the signal cross section.
BinoXS.png Figure 4a: 95\% C.L. upper limits on the signal cross section in gluino-squark mass space for a 375 GeV wino-like neutralino for the single photon analysis.
BinoXS.png Figure 4a: 95\% C.L. exclusion contours on the signal cross section in gluino-squark mass space for a 375 GeV wino-like neutralino for the single photon analysis. The shaded uncertainty band around the exclusion contours correspond to the NLO renormalization and PDF uncertainties of the signal cross section.

Additional Public Plots

Figure Caption
BinoXS.png MET spectrum of $\gamma\gamma$ data compared to QCD prediction together with the small EWK background for events without a jet requirement. The red hatched areas indicate the total background uncertainties. Two example GGM points on either side of our exclusion boundary ($m_{{\tilde{q}}} / m_{\tilde{g}} / m_{\chi0}$ in GeV) are also shown.
BinoXS.png The pT of the two EM objects in the 3 samples used in the diphoton analysis before reweighting. The $\gamma\gamma$ distribution is in black, the ff in blue, and ee in red.
BinoXS.png The pT of the two EM objects in the 3 samples used in the diphoton analysis after reweighting. The $\gamma\gamma$ distribution is in black, the ff in blue, and ee in red.
BinoXS.png The di-electron mass spectrum used to determine the electron misidentification rate $f_{e\to\gamma}$. The signal yield is determined from a Crystal Ball x Breit Wigner with a RooCMSShape background assumption.
BinoXS.png The $e-\gamma$ mass spectrum used to determine the electron misidentification rate $f_{e\to\gamma}$ The signal yield is determined from a Crystal Ball x Breit Wigner with a RooCMSShape background assumption.
BinoXS.png Event display from the diphoton analysis. The missing transverse energy of the event is indicated by the blue arrow and is 142.8 GeV. The two photons indicated as green bars at the top and bottom of the display had energy 132.5 GeV and 132.1 GeV respectively. (black background version)
BinoXS.png Event display from the diphoton analysis. The missing transverse energy of the event is indicated by the blue arrow and is 142.8 GeV. The two photons indicated as green bars at the top and bottom of the display had energy 132.5 GeV and 132.1 GeV respectively. (white background version)
BinoXS.png Leading photon pT ratio between candidate photon and fakeable objects used to correct the pT dependence in the hadronic system in the single photon analysis
BinoXS.png MC Closure demonstration for the single photon analysis in QCD and Photon Jet Monte Carlo.
BinoXS.png Example high MET event display from the single photon analysis. Missing transverse energy is 379 GeV, the photon transverse energy is 94.4 GeV, and two jets are present with transverse energy 208.4 and 172.86 GeV respectively.
-- DavidMason - 02-Jul-2012

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Topic revision: r8 - 2012-07-05 - DavidMorse
 
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