CMS-SUS-19-001

CMS-SUS-19-001 ; CERN-EP-2023-186
Search for stealth supersymmetry in final states with two photons, jets, and low missing transverse momentum in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
CMS Collaboration
5 October 2023
Phys. Rev. D 109 (2024) 112009
Abstract: The results of a search for stealth supersymmetry in final states with two photons and jets, targeting a phase space region with low missing transverse momentum ($ p_{\mathrm{T}}^\text{miss} $), are reported. The study is based on a sample of proton-proton collisions at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. As LHC results continue to constrain the parameter space of the minimal supersymmetric standard model, the low $ p_{\mathrm{T}}^\text{miss} $ regime is increasingly valuable to explore. To estimate the backgrounds due to standard model processes in such events, we apply corrections derived from simulation to an estimate based on a control selection in data. The results are interpreted in the context of simplified stealth supersymmetry models with gluino and squark pair production. The observed data are consistent with the standard model predictions, and gluino (squark) masses of up to 2150 (1850) GeV are excluded at the 95% confidence level.
Links: e-print arXiv:2310.03154 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Diagrams of the simplified models considered in this paper. The decay chain starts from the production of either gluino pairs (left) or squark pairs (right) and results in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 1-a: Simplified model diagram for a decay chain starting from the production of a gluino pair and resulting in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 1-b: Simplified model diagram for a decay chain starting from the production of a squark pair and resulting in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 2: The AGK template of the $ S_{\mathrm{T}} $ distribution, obtained with various values of $ \rho $, from the signal selection in data for $ N_{\text{jets}} = $ 2. The region shaded in yellow is the normalization sideband.
png pdf	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 $ N_{\text{jets}} $ = 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 $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	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 $ N_{\text{jets}} $ = 4. 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 $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	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 $ N_{\text{jets}} $ = 5. 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 $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	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 $ N_{\text{jets}} $ = $ \geq $6. 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 $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	Figure 4: The 95% CL upper limits on the gluino pair production cross section (left) and squark pair production cross section (right) as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.
png pdf	Figure 4-a: The 95% CL upper limits on the gluino pair production cross section as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.
png pdf	Figure 4-b: The 95% CL upper limits on the squark pair production cross section as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.

Tables
png pdf	Table 1: Best fit values of $ A $ and $ m $ with statistical $ \pm $1$\sigma $ errors, obtained from the simulated background.

Summary

A search for stealth supersymmetry in events with two photons and at least four jets is presented. No threshold requirement on the missing transverse momentum is imposed. The measurement is based on a data sample corresponding to an integrated luminosity of 138 fb$ ^{-1} $ of proton-proton collisions at $ \sqrt{s} = $ 13 TeV recorded by the CMS experiment in 2016--2018. The analysis is performed in bins of $ S_{\mathrm{T}} $, which is the sum of transverse momenta for all reconstructed particles in the event, as well as jet multiplicity $ N_{\text{jets}} $. A background model based on control samples in data is employed to estimate the standard model (SM) background in the data. The data are found to be consistent with the SM background prediction with no evidence of significant signal contribution. The results of the search are interpreted as 95% confidence level upper limits on the gluino and squark production cross sections in the context of simplified models of stealth supersymmetry. In simplified stealth models with gluino (squark) pair production, we exclude gluino masses $ m_{\mathrm{\tilde{g}}} $ (squark masses $ m_{\tilde{\mathrm{q}}} $) up to 2150 (1850) GeV. These are the most stringent limits to date on these models.

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