Search for SUSY in the inclusive diphoton final state using the razor variables

Abstract

A search for supersymmetry in pp collisions, in events with at least two photons and one jet, is presented. The dataset, collected at a center-of-mass energy $\sqrt{s}=8$ TeV in 2012, corresponds to an integrated luminosity of 19.7 fb$^{−1}$. The signal is characterized as a peak on a falling background in the razor kinematic variable $M_R$, for events in the tail of the razor ratio $R^2$. The observed event distribution in $M_R$ is compatible with the prediction derived by the events with small values of $R^2$. This result is interpreted as an exclusion limit on a set of simplified model spectra for squarks and gluinos, inspired by the phenomenology of gauge-mediated supersymmetry breaking.

Link to PAS

SUS-14-008

Figures in the PAS

Figures Caption
Figure 1: Signal vs. Background distributions in $\mathrm{M_R}$ for the two interpretations: (a) squark-gluino model (b) T5gg model. The background model is normalized to the number of events in the signal region. The signal points are normalized to integrated luminosity times selection efficiency times theoretical cross section.
Figure 2: Data distribution for $\mathrm{M_R}$ in the fake-fake control sample (a) in the control region and (b) in the signal region. For each $\mathrm{M_R}$ bin, the data (filled dots) are compared to the $68\%$ range obtained from the fit in the control region and extrapolated to the signal region, represented by the blue outlined band. The empty dots represent the center of the $68\%$ range. The bottom panel of each figure gives the z-score (number of gaussian standard deviations) comparing the filled dots to the band. The purple band shows the position of the $68\%$ window about the expected value.
  Figure 3: Data distribution for $\mathrm{M_R}$ in a sample of fake-fake data events and injected with simulated squark and gluino events. Squark and gluino masses are set to $m_{\widetilde{q}} = 1400$ GeV and $m_{\widetilde{g}} = 1820$ GeV respectively, and the production cross section is fixed to $\sigma = 2.7$ fb. The signal contribution is shown by the red histogram. For each $\mathrm{M_R}$ bin, the data (filled dots) are compared to the $68\%$ range obtained from the fit in the control region and extrapolated to the signal region, represented by the blue outlined band. The empty dots represent the center of the $68\%$ range. The bottom panel of each figure gives the z-score (number of gaussian standard deviations) comparing the filled dots to the band. The purple band shows the position of the $68\%$ window about the expected value.
Figure 4: Data distribution for $\mathrm{M_R}$ in the data (a) control region and (b) signal region. For each $\mathrm{M_R}$ bin, the data (filled dots) are compared to the $68\%$ range obtained from the fit in the control region and extrapolated to the signal region, represented by the colored band. The empty dots represent the center of the $68\%$ range. The bottom panel of each figure gives the z-score obtained comparing the filled dots to the band.The purple band shows the position of the $68\%$ window about the expected value.
Figure 5: Feynman diagram for (a) squark-squark production, (b) squark-squark decaying through gluino-gluino, and (c) gluino-gluino decaying through squark-squark in the squark-gluino model and (d) for gluino-gluino in the simplified model T5gg.
Figure 6: Excluded mass region for (a) squark-gluino model and (b) T5gg. The red (black) dashed line shows the expected (observed) limit. The thin dashed blue line and band show the $68\%$ range about the expected limit. The black solid line quantifies the impact of the theoretical uncertainty in the cross section on the observed limit. The color code to the right of the figure shows the excluded cross section for each set of mass values.

Benchmark Signal Points

Selection yields for benchmark signal points. The baseline Razor selection is $M_R > 600$ GeV and $R^{2} > 0.01$ with a signal region of $R^{2} > 0.02$. Errors are statistical.

pdf

Associated LHE files:

SLHA files for GGM Samples:

Electronic Files for limit

Additional Material

Figures Caption
Signal candidate event with $M_R = 2270$ GeV $R^2 = 0.021$ $ME_T = 180$ GeV

-- JoshuaHardenbrook - 07 Aug 2014

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf T5gg_broad_proton.pdf r1 manage 8.3 K 2014-07-11 - 19:03 ToyokoOrimoto  
PNGpng T5gg_broad_proton.png r1 manage 29.4 K 2014-07-11 - 19:03 ToyokoOrimoto  
PDFpdf cut_flow.pdf r3 r2 r1 manage 78.6 K 2014-08-07 - 14:58 JoshuaHardenbrook  
PNGpng cut_flow.png r3 r2 r1 manage 82.2 K 2014-08-07 - 14:58 JoshuaHardenbrook  
PDFpdf ev1-202060_355004733_284_RhoPhi.pdf r1 manage 154.5 K 2014-07-11 - 19:55 ToyokoOrimoto  
PNGpng ev1-202060_355004733_284_RhoPhi.png r1 manage 165.4 K 2014-07-11 - 19:55 ToyokoOrimoto  
PDFpdf extrap.pdf r1 manage 17.2 K 2014-07-11 - 18:58 ToyokoOrimoto  
PNGpng extrap.png r1 manage 105.9 K 2014-07-11 - 18:58 ToyokoOrimoto  
PDFpdf fake_extrap.pdf r2 r1 manage 16.9 K 2014-07-17 - 20:37 JoshuaHardenbrook  
PNGpng fake_extrap.png r2 r1 manage 29.2 K 2014-07-17 - 20:37 JoshuaHardenbrook  
PDFpdf fake_low_fit.pdf r2 r1 manage 17.0 K 2014-07-17 - 20:37 JoshuaHardenbrook  
PNGpng fake_low_fit.png r2 r1 manage 28.6 K 2014-07-17 - 20:37 JoshuaHardenbrook  
C source code filec limit_ggm.C r1 manage 3.0 K 2014-07-22 - 13:10 JoshuaHardenbrook  
Unknown file formatroot limit_ggm.root r1 manage 7.5 K 2014-07-22 - 13:10 JoshuaHardenbrook  
C source code filec limit_t5gg.C r1 manage 3.0 K 2014-07-22 - 13:10 JoshuaHardenbrook  
Unknown file formatroot limit_t5gg.root r1 manage 9.6 K 2014-07-22 - 13:10 JoshuaHardenbrook  
PDFpdf low_fit.pdf r1 manage 17.1 K 2014-07-11 - 18:58 ToyokoOrimoto  
PNGpng low_fit.png r1 manage 102.7 K 2014-07-11 - 18:58 ToyokoOrimoto  
PDFpdf ra3_exp_limit.pdf r4 r3 r2 r1 manage 18.7 K 2014-07-23 - 11:17 JoshuaHardenbrook  
PNGpng ra3_exp_limit.png r4 r3 r2 r1 manage 65.1 K 2014-07-23 - 11:17 JoshuaHardenbrook  
PDFpdf ra3_gqBgqB.pdf r1 manage 8.6 K 2014-07-11 - 19:03 ToyokoOrimoto  
PNGpng ra3_gqBgqB.png r1 manage 28.5 K 2014-07-11 - 19:03 ToyokoOrimoto  
PDFpdf ra3_qBqB.pdf r1 manage 7.6 K 2014-07-11 - 19:03 ToyokoOrimoto  
PNGpng ra3_qBqB.png r1 manage 23.5 K 2014-07-11 - 19:03 ToyokoOrimoto  
PDFpdf ra3_qgBqgB.pdf r1 manage 8.7 K 2014-07-11 - 19:03 ToyokoOrimoto  
PNGpng ra3_qgBqgB.png r1 manage 30.4 K 2014-07-11 - 19:03 ToyokoOrimoto  
PDFpdf ra3_s_v_b.pdf r2 r1 manage 17.1 K 2014-07-16 - 14:35 JoshuaHardenbrook  
PNGpng ra3_s_v_b.png r2 r1 manage 26.6 K 2014-07-16 - 14:35 JoshuaHardenbrook  
PDFpdf signal_inj.pdf r2 r1 manage 17.6 K 2014-07-17 - 20:40 JoshuaHardenbrook  
PNGpng signal_inj.png r2 r1 manage 33.5 K 2014-07-17 - 20:39 JoshuaHardenbrook  
PDFpdf t5gg_exp_limit.pdf r3 r2 r1 manage 20.8 K 2014-07-21 - 19:13 JoshuaHardenbrook  
PNGpng t5gg_exp_limit.png r3 r2 r1 manage 62.2 K 2014-07-21 - 19:13 JoshuaHardenbrook  
PDFpdf t5gg_s_v_b.pdf r2 r1 manage 17.0 K 2014-07-17 - 20:37 JoshuaHardenbrook  
PNGpng t5gg_s_v_b.png r3 r2 r1 manage 25.2 K 2014-07-17 - 20:37 JoshuaHardenbrook  
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