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| CMS-EXO-21-004 ; CERN-EP-2024-059 | ||
| Searches for pair-produced multijet resonances using data scouting in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 3 April 2024 | ||
| Accepted for publication in Phys. Rev. Lett. | ||
| Abstract: Searches for pair-produced multijet signatures using data corresponding to an integrated luminosity of 128 fb$ ^{-1} $ of proton-proton collisions at $ \sqrt{s} = $ 13 TeV are presented. A data scouting technique is employed to record events with low jet scalar transverse momentum sum values. The electroweak production of particles predicted in $ R $-parity violating supersymmetric models is probed for the first time with fully hadronic final states. This is the first search for prompt hadronically decaying mass-degenerate higgsinos, and extends current exclusions on $ R $-parity violating top squarks and gluinos. | ||
| Links: e-print arXiv:2404.02992 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Benchmark RPV SUSY models for merged trijets (left), merged dijets (middle), and resolved trijets (right). The red circles group the final state quarks (or anti-quarks) according to the expected jet clustering of their hadronization products. |
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Figure 1-a:
Benchmark RPV SUSY models for merged trijets (left), merged dijets (middle), and resolved trijets (right). The red circles group the final state quarks (or anti-quarks) according to the expected jet clustering of their hadronization products. |
png pdf |
Figure 1-b:
Benchmark RPV SUSY models for merged trijets (left), merged dijets (middle), and resolved trijets (right). The red circles group the final state quarks (or anti-quarks) according to the expected jet clustering of their hadronization products. |
png pdf |
Figure 1-c:
Benchmark RPV SUSY models for merged trijets (left), merged dijets (middle), and resolved trijets (right). The red circles group the final state quarks (or anti-quarks) according to the expected jet clustering of their hadronization products. |
png pdf |
Figure 2:
The distribution of average jet mass in the data (points), for the search for pair-produced merged resonances decaying to trijets (left) and dijets (right), compared to a background-only prediction from GP regression (blue), and the full background fit including simulations (red) of SM resonances from $ \mathrm{t} \bar{\mathrm{t}} $ (left) and W/Z+ jets (right). Also shown are the expected shapes of signals from $ R $-parity violating gluinos with resonance masses 70 (green), 125 (yellow) and 200 GeV(purple), with arbitrary normalizations. The bottom panel shows the difference between the data and the final background estimate, divided by the statistical uncertainty of the data in each bin, with fit uncertainty shown in blue. |
png pdf |
Figure 2-a:
The distribution of average jet mass in the data (points), for the search for pair-produced merged resonances decaying to trijets (left) and dijets (right), compared to a background-only prediction from GP regression (blue), and the full background fit including simulations (red) of SM resonances from $ \mathrm{t} \bar{\mathrm{t}} $ (left) and W/Z+ jets (right). Also shown are the expected shapes of signals from $ R $-parity violating gluinos with resonance masses 70 (green), 125 (yellow) and 200 GeV(purple), with arbitrary normalizations. The bottom panel shows the difference between the data and the final background estimate, divided by the statistical uncertainty of the data in each bin, with fit uncertainty shown in blue. |
png pdf |
Figure 2-b:
The distribution of average jet mass in the data (points), for the search for pair-produced merged resonances decaying to trijets (left) and dijets (right), compared to a background-only prediction from GP regression (blue), and the full background fit including simulations (red) of SM resonances from $ \mathrm{t} \bar{\mathrm{t}} $ (left) and W/Z+ jets (right). Also shown are the expected shapes of signals from $ R $-parity violating gluinos with resonance masses 70 (green), 125 (yellow) and 200 GeV(purple), with arbitrary normalizations. The bottom panel shows the difference between the data and the final background estimate, divided by the statistical uncertainty of the data in each bin, with fit uncertainty shown in blue. |
png pdf |
Figure 3:
The distribution of trijet mass in the data (points), for the three search regions (left, middle and right) for pair-produced resolved resonances decaying to trijets, compared to a background-only fit from GP regression (blue), and (left) the full background fit including simulation of a SM resonance from $ \mathrm{t} \bar{\mathrm{t}} $ production (red). Also shown are the expected shapes of signals from $ R $-parity violating gluinos at various masses (green, yellow and purple), with arbitrary normalizations. The search range is indicated by the vertical dashed lines. The bottom panel shows the difference in each bin between the data and the final background estimate, divided by the statistical uncertainty of the data, with fit uncertainty shown in blue. |
png pdf |
Figure 3-a:
The distribution of trijet mass in the data (points), for the three search regions (left, middle and right) for pair-produced resolved resonances decaying to trijets, compared to a background-only fit from GP regression (blue), and (left) the full background fit including simulation of a SM resonance from $ \mathrm{t} \bar{\mathrm{t}} $ production (red). Also shown are the expected shapes of signals from $ R $-parity violating gluinos at various masses (green, yellow and purple), with arbitrary normalizations. The search range is indicated by the vertical dashed lines. The bottom panel shows the difference in each bin between the data and the final background estimate, divided by the statistical uncertainty of the data, with fit uncertainty shown in blue. |
png pdf |
Figure 3-b:
The distribution of trijet mass in the data (points), for the three search regions (left, middle and right) for pair-produced resolved resonances decaying to trijets, compared to a background-only fit from GP regression (blue), and (left) the full background fit including simulation of a SM resonance from $ \mathrm{t} \bar{\mathrm{t}} $ production (red). Also shown are the expected shapes of signals from $ R $-parity violating gluinos at various masses (green, yellow and purple), with arbitrary normalizations. The search range is indicated by the vertical dashed lines. The bottom panel shows the difference in each bin between the data and the final background estimate, divided by the statistical uncertainty of the data, with fit uncertainty shown in blue. |
png pdf |
Figure 3-c:
The distribution of trijet mass in the data (points), for the three search regions (left, middle and right) for pair-produced resolved resonances decaying to trijets, compared to a background-only fit from GP regression (blue), and (left) the full background fit including simulation of a SM resonance from $ \mathrm{t} \bar{\mathrm{t}} $ production (red). Also shown are the expected shapes of signals from $ R $-parity violating gluinos at various masses (green, yellow and purple), with arbitrary normalizations. The search range is indicated by the vertical dashed lines. The bottom panel shows the difference in each bin between the data and the final background estimate, divided by the statistical uncertainty of the data, with fit uncertainty shown in blue. |
png pdf |
Figure 4:
Observed limits (points) and expected limits (dashed curves) on the product of the production cross section ($ \sigma $), branching fraction (B), and acceptance (A) for pair produced merged trijets (left), merged dijets (middle), and pair produced resolved trijets right). The vertical lines on the resolved three quark resonance limits (right) indicate the different search regions. The limits are compared to theoretical predictions for the pair production of $ R $-parity violating gluinos (red in left and right), mass degenerate higgsinos (blue in left), and top squarks (red in middle). |
png pdf |
Figure 4-a:
Observed limits (points) and expected limits (dashed curves) on the product of the production cross section ($ \sigma $), branching fraction (B), and acceptance (A) for pair produced merged trijets (left), merged dijets (middle), and pair produced resolved trijets right). The vertical lines on the resolved three quark resonance limits (right) indicate the different search regions. The limits are compared to theoretical predictions for the pair production of $ R $-parity violating gluinos (red in left and right), mass degenerate higgsinos (blue in left), and top squarks (red in middle). |
png pdf |
Figure 4-b:
Observed limits (points) and expected limits (dashed curves) on the product of the production cross section ($ \sigma $), branching fraction (B), and acceptance (A) for pair produced merged trijets (left), merged dijets (middle), and pair produced resolved trijets right). The vertical lines on the resolved three quark resonance limits (right) indicate the different search regions. The limits are compared to theoretical predictions for the pair production of $ R $-parity violating gluinos (red in left and right), mass degenerate higgsinos (blue in left), and top squarks (red in middle). |
png pdf |
Figure 4-c:
Observed limits (points) and expected limits (dashed curves) on the product of the production cross section ($ \sigma $), branching fraction (B), and acceptance (A) for pair produced merged trijets (left), merged dijets (middle), and pair produced resolved trijets right). The vertical lines on the resolved three quark resonance limits (right) indicate the different search regions. The limits are compared to theoretical predictions for the pair production of $ R $-parity violating gluinos (red in left and right), mass degenerate higgsinos (blue in left), and top squarks (red in middle). |
| Tables | |
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Table 1:
Selection requirements for the resolved trijet resonance search listed for the three regions of three-jet resonance mass. |
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Table 2:
Summary of the systematic uncertainties in the signal yield and shape, for the searches for merged three and two quark, and resolved trijet resonances. |
| Summary |
| In summary, a search has been performed for pair-produced multijet resonances using data scouting, where the jets in the final state can be either merged or resolved individually. This search accurately reconstructs the hadronic decays of the top quark and W, Z bosons, in agreement with SM expectations. New, additional resonances were not observed, with the largest excess consistent with a three jet resonance mass of 770 GeV, but with a local significance of only 2.6 standard deviations. This search extends the previous limits on $ R $-parity violating models of top squarks and gluinos, and sets the first exclusion limits on $ R $-parity violating mass-degenerate, prompt, and hadronically decaying higgsinos. |
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