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| CMS-PAS-SUS-19-001 | ||
| Search for stealth SUSY in final states with two photons, jets, and low missing transverse momentum | ||
| CMS Collaboration | ||
| 13 March 2023 | ||
| Abstract: The results of a search for stealth supersymmetry (SUSY) in final states with two photons, jets, and low missing transverse momentum are reported. The study is based on a 138 fb$ ^{-1} $ sample of proton-proton collisions collected at 13 TeV with the CMS detector. Many models of new physics predict the production of events with jets and electroweak gauge bosons, with little or no missing transverse momentum. Examples include stealth models of SUSY, which predict a hidden sector at the electroweak energy scale for which SUSY is an approximately unbroken symmetry. The results are interpreted in the context of simplified stealth models with gluino and squark pair production. The observed data are consistent with the Standard Model prediction, and gluino (squark) masses of up to 2.1 (1.85) TeV are excluded. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Diagrams of the simplified models considered in this note. The decay chain starts from the production of either gluino pairs (upper figure) or squark pairs (lower figure), and results in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $. |
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Figure 1-a:
Diagrams of the simplified models considered in this note. The decay chain starts from the production of either gluino pairs (upper figure) or squark pairs (lower figure), and results in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $. |
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Figure 1-b:
Diagrams of the simplified models considered in this note. The decay chain starts from the production of either gluino pairs (upper figure) or squark pairs (lower figure), and results in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $. |
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Figure 2:
AGK template, obtained with various values of $ \rho $, from the signal selection in observed data for $ \mathrm{N}_{\mathrm{Jets}} $ = 2. The region shaded in yellow is the normalization sideband. |
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Figure 3:
Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for jet multiplicity = 4 (upper), 5 (middle), and $ \geq $ 6 (lower). The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the ($ \mathrm{m}_{\mathrm{\widetilde{g}}} $/$ \mathrm{m}_{\tilde{\mathrm{q}}} $, $ \mathrm{m}_{\tilde{\chi}_{1}^{0}} $) parameter space. |
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Figure 3-a:
Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for jet multiplicity = 4 (upper), 5 (middle), and $ \geq $ 6 (lower). The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the ($ \mathrm{m}_{\mathrm{\widetilde{g}}} $/$ \mathrm{m}_{\tilde{\mathrm{q}}} $, $ \mathrm{m}_{\tilde{\chi}_{1}^{0}} $) parameter space. |
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Figure 3-b:
Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for jet multiplicity = 4 (upper), 5 (middle), and $ \geq $ 6 (lower). The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the ($ \mathrm{m}_{\mathrm{\widetilde{g}}} $/$ \mathrm{m}_{\tilde{\mathrm{q}}} $, $ \mathrm{m}_{\tilde{\chi}_{1}^{0}} $) parameter space. |
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Figure 3-c:
Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for jet multiplicity = 4 (upper), 5 (middle), and $ \geq $ 6 (lower). The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the ($ \mathrm{m}_{\mathrm{\widetilde{g}}} $/$ \mathrm{m}_{\tilde{\mathrm{q}}} $, $ \mathrm{m}_{\tilde{\chi}_{1}^{0}} $) parameter space. |
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Figure 4:
95% CL upper limits on the gluino pair production cross section (upper) and squark pair production cross section (lower) as a function of gluino (squark) and neutralino masses. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. |
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Figure 4-a:
95% CL upper limits on the gluino pair production cross section (upper) and squark pair production cross section (lower) as a function of gluino (squark) and neutralino masses. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. |
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Figure 4-b:
95% CL upper limits on the gluino pair production cross section (upper) and squark pair production cross section (lower) as a function of gluino (squark) and neutralino masses. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. |
| Tables | |
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Table 1:
Best-fit values of $ A $ and $ m $ with errors obtained from the simulated background |
| Summary |
| We perform a search for stealth supersymmetry in events with two photons, at least four jets, and low missing transverse momentum based on a data sample corresponding to an integrated luminosity of 138 fb$ ^{-1} $ of pp collisions at $ \sqrt{s} = $ 13 TeV recorded by the CMS experiment in 2016, 2017, and 2018. The data are examined in bins of $ S_{\mathrm{T}} $, which is the sum of $ p_{\mathrm{T}} $ for all reconstructed particles in the event, as well as jet multiplicity. A data-driven background model is employed to estimate the standard model background in the data. The results of the search are interpreted as 95% confidence level upper limits on the gluino and squark production cross section in the context of simplified models of stealth supersymmetry. The data are consistent with the SM background prediction, and we exclude gluinos (squarks) with masses up to 2.15 TeV (1.85 TeV) in these models. Despite a relaxation of assumptions in the background modeling as compared to previously published results, we achieve a $ \sim$70% improvement in the reach of the exclusion contour in the ($ \mathrm{m}_{\tilde{\mathrm{q}}} $, $ \mathrm{m}_{\tilde{\chi}_{1}^{0}} $) parameter space. These are the most stringent limits on with these models. |
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