Search for supersymmetry in events with one photon, jets and missing transverse energy at \(\sqrt{s}=\) 8 TeV (SUS-14-004)

Abstract

A search for beyond the standard model physics in events with at least one photon, missing transverse energy and jets is presented. The data sample corresponds to an integrated luminosity of 19.7 fb\(^{-1}\) of pp collisions at \(\sqrt{s}=\) 8 TeV, recorded by the CMS experiment at the LHC. The missing transverse energy distribution in events containing at least one photon and at least two hadronic jets is compared to the spectra expected from standard model processes. No excess of events at high missing transverse energy is observed. The results are interpreted in the context of General Gauge Mediated SUSY with the next-to-lightest SUSY particle being either a bino or wino-like neutralino. A 95% confidence level exclusion region is defined for the production cross section in bino and wino-like neutralino scenarios.

Link to Physics Analysis Summary (PAS)

This analysis has been documented in the SUS-14-004

Figures in SUS-14-004

Figure Caption
Sample Feynman diagram of a typical photon final state expected within the GGM framework for a bino-like (top) and a wino-like (bottom) neutralino scenario.
Simulation of multi-jet and photon plus jet events. The direct simulation is compared to the prediction from the simulation using the QCD background method in bins of jet multiplicity (top), and \( {\not\mathrel{E}}_\textrm{T} \) (bottom). The \( {\not\mathrel{E}}_\textrm{T} \) plot is diveded by the bin width. The weights are calculated in the control region for events with \( {\not\mathrel{E}}_\textrm{T} \) < 100 GeV, which is only shown in the bottom plot.
Simulation of \(W\) Boson and \(t\bar{t}\) events. The direct simulation with photons origination from generated electrons is compared to the prediction from the simulation using the EWK background method in bins of jet multiplicity (top) and \( {\not\mathrel{E}}_\textrm{T} \) (bottom).
Total standard model background prediction in \( {\not\mathrel{E}}_\textrm{T} \) compared to the number of single-photon events, including one GGM signal benchmark point as an example where the squark and gluino masses are given in GeV and the neutralino is wino-like. The upper plot is divided by the bin widths and the bottom ratio plot shows the event yields relative to the total background prediction.
Resulting event yields for the data corresponding to 19.7fb\(^{-1}\), the estimated background, and a signal scenario for a wino-like neutralino of 375 GeV, a squark mass of 1700 GeV, a gluino mass of 720 GeV, and a total signal cross section of 0.3164 pb. The combined observed (expected) CLs cross-section limit for this point is 0.0994 pb (0.0913pb) at 95% CL.
Observed upper limits at 95% C.L. on the signal cross section in the gluino-squark mass space for bino (top) and wino-like (bottom) neutralino. ROOT-files are available here and here.
Observed and expected exclusion contours at 95 % C.L. in the gluino-squark mass space for bino (top) and wino-like (bottom) neutralino. The shaded uncertainty band around the exclusion contours correspond to the theoretical uncertainty. ROOT-files are available here and here.

Additional material

Figure Caption
Simulation of signal, multi-jet and photon plus jet events. The direct simulation is compared to the prediction from the simulation using the QCD background method in bins of \( {\not\mathrel{E}}_\textrm{T} \).
Signal acceptance in the gluino-squark mass space for bino-like (top) and wino-like (bottom) neutralino scenarios.
Signal acceptance for bino-like (top) and wino-like (bottom) neutralino scenarios in each of the \( {\not\mathrel{E}}_\textrm{T} \) bins used for the statistical interpretation. ROOT-files are available here and here.
The signal contamination defined as background prediction from signal events relative to the signal yield in the gluino-squark mass space for bino-like (top) and wino-like (bottom) neutralino scenarios in each of the \( {\not\mathrel{E}}_\textrm{T} \) bins used for the statistical interpretation. ROOT-files are available here and here.
Signal selection efficiency for a GGM scenario with wino-like neutralino, a squark mass of 1700 GeV, a gluino mass of 720 GeV, and a neutralino mass of 375 GeV.
This script can help you reading the ROOT files.

Topic attachments
I Attachment History Action Size Date Who Comment
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