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| CMS-PAS-EXO-19-001 | ||
| Search for long-lived particles using delayed jets and missing transverse momentum with proton-proton collisions at $\sqrt{s}$ = 13 TeV | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A search for long-lived particles decaying to delayed jets and missing transverse momentum is presented. The analysis is performed using a data set of 137 fb$^{-1}$ of $\sqrt{s} =$ 13 TeV proton-proton collisions recorded by the CMS experiment. Candidate signal events containing delayed jets are identified using the timing capabilities of the CMS Electromagnetic Calorimeter. The results of the search are consistent with the background prediction and are interpreted using a gauge-mediated supersymmetry breaking reference model. Masses up to 2500 and 2150 GeV are excluded for proper decay lengths of 1 m and 30 m respectively. | ||
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These preliminary results are superseded in this paper, PLB 797 (2019) 134876. The superseded preliminary plots can be found here. |
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| Figures & Tables | Summary | Additional Figures & Tables | References | CMS Publications |
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| Figures | |
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Figure 1:
(a) Feynman diagram for the gluino GMSB signal model and (b) diagram showing a characteristic event which would be expected to pass signal model selection with delayed energy deposition in the ECAL and HCAL but without tracks from a primary vertex. |
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Figure 1-a:
Feynman diagram for the gluino GMSB signal model. |
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Figure 1-b:
Diagram showing a characteristic event which would be expected to pass signal model selection with delayed energy deposition in the ECAL and HCAL but without tracks from a primary vertex. |
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Figure 2:
The timing distribution of the backgrounds predicted to contribute to the signal region is compared to representative signal models. The templates for the major backgrounds are taken from control regions and normalised by the predictions detailed in Section xxxxx. No events are observed in data for $ {t_{\textrm {jet}}} > $ 3 ns. |
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Figure 3:
Efficiency in the mass and ${c\tau _{0}}$ plane for the GMSB model after all selections. |
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Figure 4:
The 95% CL observed upper limits on $\sigma \times \textrm {BR}^2$ in the mass and ${c\tau _{0}}$ plane for the GMSB model after all selections for 137 fb$^{-1}$. The contour of 95% CL expected upper limits on $\sigma /\sigma _{\textrm {theory}} = $ 1 is shown in the solid line while the plus and minus one sigma variations are shown in the dashed lines. The observed limit is shown in the solid black line. |
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Figure 5:
Expected and observed limit on $\sigma \times \textrm {BR}^2$ after all signal region selections for a gluino GMSB model with $ {m_{\tilde{g}}}=$ 2400 GeV are shown in the dotted and solid black lines respectively. The one (two) sigma variation in the expected limit is shown in green (yellow). The blue solid line shows the observed limit achieved by the CMS displaced jet search [43]. |
| Tables | |
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Table 1:
Summary of the selections used to define the signal region. |
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Table 2:
Background prediction summary. |
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Table 3:
The derived variation on the acceptance on the modelling of the jet variables discussed in Section yyyyy for a representative model with $ {m_{\tilde{g}}}= $ 2400 GeV. |
| Summary |
| An inclusive search for long-lived particles is reported, based on a data sample of pp collisions collected at $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$. The search uses timing of electromagnetic energy deposits to select delayed jets from the decays from heavy long-lived particles, with residual backgrounds estimated using measurements in control regions of the data. The results are interpreted using the gluino GMSB signal model, and gluino masses below 2100 GeV are excluded for decay lengths of ctau between 0.3 and 30 m. The reach is significantly extended in comparison to tracker based searches at CMS and ATLAS for ${t_{\textrm{cell}}} au > \sim$ 1 m [44,43,16]. |
| Additional Figures | |
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Additional Figure 1:
The distribution of number of ECAL cells hit in the jet for jets in a background enriched data sample (satisfying $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets satisfying signal region requirements (except those on ${E_{\textrm {ECAL}}}$ and ${N^{\textrm {cell}}_{\textrm {ECAL}}}$). |
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Additional Figure 1-a:
The distribution of number of ECAL cells hit in the jet for jets in a background enriched data sample (satisfying $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets satisfying signal region requirements (except those on ${E_{\textrm {ECAL}}}$ and ${N^{\textrm {cell}}_{\textrm {ECAL}}}$). |
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Additional Figure 1-b:
The distribution of number of ECAL cells hit in the jet for jets in a background enriched data sample (satisfying $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets satisfying signal region requirements (except those on ${E_{\textrm {ECAL}}}$ and ${N^{\textrm {cell}}_{\textrm {ECAL}}}$). |
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Additional Figure 1-c:
The distribution of number of ECAL cells hit in the jet for jets in a background enriched data sample (satisfying $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets satisfying signal region requirements (except those on ${E_{\textrm {ECAL}}}$ and ${N^{\textrm {cell}}_{\textrm {ECAL}}}$). |
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Additional Figure 2:
The distribution of $ {\textrm {HEF}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {\textrm {HEF}} $). |
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Additional Figure 2-a:
The distribution of $ {\textrm {HEF}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {\textrm {HEF}} $). |
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Additional Figure 2-b:
The distribution of $ {\textrm {HEF}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {\textrm {HEF}} $). |
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Additional Figure 2-c:
The distribution of $ {\textrm {HEF}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {\textrm {HEF}} $). |
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Additional Figure 3:
The distribution of $ {E_{\textrm {HCAL}}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {E_{\textrm {HCAL}}} $). |
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Additional Figure 3-a:
The distribution of $ {E_{\textrm {HCAL}}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {E_{\textrm {HCAL}}} $). |
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Additional Figure 3-b:
The distribution of $ {E_{\textrm {HCAL}}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {E_{\textrm {HCAL}}} $). |
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Additional Figure 3-c:
The distribution of $ {E_{\textrm {HCAL}}} $ for a data sample enriched in beam halo and noise jets (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4) and for signal jets passing signal region selections (except on $ {E_{\textrm {HCAL}}} $). |
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Additional Figure 4:
The distribution of ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 4-a:
The distribution of ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 4-b:
The distribution of ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 4-c:
The distribution of ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 5:
The distribution of ${t^{\textrm {RMS}}_\textrm {jet}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 5-a:
The distribution of ${t^{\textrm {RMS}}_\textrm {jet}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 5-b:
The distribution of ${t^{\textrm {RMS}}_\textrm {jet}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 5-c:
The distribution of ${t^{\textrm {RMS}}_\textrm {jet}}$ for data sample enriched in jets from noise (satisfying $|\eta | < $ 1.48, $ {p_{\mathrm {T}}} > $ 30 GeV, $ {PV_{\rm track}^{\rm fraction}} > $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {t_{\textrm {jet}}} < -3 $ ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8) and for signal jets passing signal region selections (except on ${{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}}$ and ${t^{\textrm {RMS}}_\textrm {jet}}$). |
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Additional Figure 6:
The distribution of ${PV_{\rm track}^{\rm fraction}}$ for a data sample enriched in core backgrounds (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $| {t_{\textrm {jet}}} | < $ 3 ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${PV_{\rm track}^{\rm fraction}}$). |
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Additional Figure 6-a:
The distribution of ${PV_{\rm track}^{\rm fraction}}$ for a data sample enriched in core backgrounds (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $| {t_{\textrm {jet}}} | < $ 3 ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${PV_{\rm track}^{\rm fraction}}$). |
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Additional Figure 6-b:
The distribution of ${PV_{\rm track}^{\rm fraction}}$ for a data sample enriched in core backgrounds (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $| {t_{\textrm {jet}}} | < $ 3 ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${PV_{\rm track}^{\rm fraction}}$). |
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Additional Figure 6-c:
The distribution of ${PV_{\rm track}^{\rm fraction}}$ for a data sample enriched in core backgrounds (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $| {t_{\textrm {jet}}} | < $ 3 ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${PV_{\rm track}^{\rm fraction}}$). |
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Additional Figure 7:
The distribution of ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} < $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$). |
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Additional Figure 7-a:
The distribution of ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} < $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$). |
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Additional Figure 7-b:
The distribution of ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} < $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$). |
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Additional Figure 7-c:
The distribution of ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} < $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} < -3 $ ns and $ {E_{\textrm {ECAL}}} > $ 20 GeV) and for signal jets passing signal selections (except on ${E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}}$). |
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Additional Figure 8:
The distribution of ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$). |
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Additional Figure 8-a:
The distribution of ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$). |
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Additional Figure 8-b:
The distribution of ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$). |
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Additional Figure 8-c:
The distribution of ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})}$). |
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Additional Figure 9:
The distribution of ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$). |
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Additional Figure 9-a:
The distribution of ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$). |
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Additional Figure 9-b:
The distribution of ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$). |
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Additional Figure 9-c:
The distribution of ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$ for a data sample enriched in cosmic muons (satisfying $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} < $ 0.8, $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12, $ {\textrm {HEF}} > $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $ {t_{\textrm {jet}}} > $ 3 ns, $ {E_{\textrm {ECAL}}} > $ 20 GeV and failing the HCAL noise rejection quality filters) and for signal jets passing signal selections (except on ${\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})}$). |
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Additional Figure 10:
The $\eta $ dependence of the jet time for jets passing beam halo selection and with $| {t_{\textrm {jet}}} | > $ 2 ns. The black lines show the expected time distribution from the path difference for beam halo from the main bunch. Additional deposits, including those aat positive times, come from beam halo associated with satellite and following or previous main bunches. |
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Additional Figure 11:
The distribution of ${PV_{\rm track}^{\rm fraction}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {\textrm {HEF}} < $ 0.2, $ {{t^{\textrm {RMS}}_\textrm {jet}} / {t_{\textrm {jet}}}} < $ 0.4, $jtrms < $ 2.5 and $ {t_{\textrm {jet}}} < -3 $ ns). |
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Additional Figure 12:
The distribution of ${t^{\textrm {RMS}}_\textrm {jet}}$ for a data sample enriched in beam halo (satisfying $ {p_{\mathrm {T}}} > $ 30 GeV, $|\eta | < $ 1.48, $ {\textrm {HEF}} < $ 0.2, $ {PV_{\rm track}^{\rm fraction}} < $ 1/12 and $ {t_{\textrm {jet}}} < -3 $ ns). |
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Additional Figure 13:
Distribution of ${t_{\textrm {jet}}}$ for jets with the full Run 2 dataset with no cleaning selection applied (a) and after all jet cleaning selections are applied (b) in events satisfying the trigger requirements and satisfying $ {{p_{\mathrm {T}}} ^\text {miss}} >$ 300. The jets are required to pass an inverted selection of $ {PV_{\rm track}^{\rm fraction}} > $ 1/12 to enrich in jets from core backgrounds and satellite bunches. The cleaning selections are shown to reduce the backgrounds by many orders of magnitude. |
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Additional Figure 13-a:
Distribution of ${t_{\textrm {jet}}}$ for jets with the full Run 2 dataset with no cleaning selection applied in events satisfying the trigger requirements and satisfying $ {{p_{\mathrm {T}}} ^\text {miss}} >$ 300. The jets are required to pass an inverted selection of $ {PV_{\rm track}^{\rm fraction}} > $ 1/12 to enrich in jets from core backgrounds and satellite bunches. The cleaning selections are shown to reduce the backgrounds by many orders of magnitude. |
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Additional Figure 13-b:
Distribution of ${t_{\textrm {jet}}}$ for jets with the full Run 2 dataset after all jet cleaning selections are applied in events satisfying the trigger requirements and satisfying $ {{p_{\mathrm {T}}} ^\text {miss}} >$ 300. The jets are required to pass an inverted selection of $ {PV_{\rm track}^{\rm fraction}} > $ 1/12 to enrich in jets from core backgrounds and satellite bunches. The cleaning selections are shown to reduce the backgrounds by many orders of magnitude. |
png pdf |
Additional Figure 14:
Distribution of ${t_{\textrm {jet}}}$ for jets with the full Run 2 dataset in events satisfying the trigger requirements and satisfying $ {{p_{\mathrm {T}}} ^\text {miss}} < 300$. An inverted selection of $ {PV_{\rm track}^{\rm fraction}} > $ 1/12 enriches in jets from core backgrounds and satellite bunches (all other jet cleaning selections are applied). Clear contributions from jets from satellite bunch collisions can be seen peaked around -5, 5 and 10 ns. |
png pdf |
Additional Figure 15:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (black background). |
png pdf |
Additional Figure 15-a:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (black background). |
png pdf |
Additional Figure 15-b:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (black background). |
png pdf |
Additional Figure 15-c:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (black background). |
png pdf |
Additional Figure 16:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (white background). |
png pdf |
Additional Figure 16-a:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (white background). |
png pdf |
Additional Figure 16-b:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (white background). |
png pdf |
Additional Figure 16-c:
Event display for a beam muon candidate event which satisfies all signal selections except for $ {\textrm {HEF}} $ and $ {E^{\textrm {CSC}}_\textrm {ECAL}/E_{\textrm {ECAL}}} $ (white background). |
png pdf |
Additional Figure 17:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 17-a:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 17-b:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 17-c:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 18:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 18-a:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 18-b:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 18-c:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{DT}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 19:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 19-a:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 19-b:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 19-c:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (black background). |
png pdf |
Additional Figure 20:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 20-a:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 20-b:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 20-c:
Event display for a cosmic muon candidate which satisfies all signal selections except for $ {\textrm {max}(\Delta \phi ^{RPC}_{\textrm {paired}})} $ (white background). |
png pdf |
Additional Figure 21:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (black background). |
png pdf |
Additional Figure 21-a:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (black background). |
png pdf |
Additional Figure 21-b:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (black background). |
png pdf |
Additional Figure 21-c:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (black background). |
png pdf |
Additional Figure 22:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (white background). |
png pdf |
Additional Figure 22-a:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (white background). |
png pdf |
Additional Figure 22-b:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (white background). |
png pdf |
Additional Figure 22-c:
Event display for a satellite bunch candidate which satisfies all signal selections except for $ {PV_{\rm track}^{\rm fraction}} $ (white background). |
png pdf |
Additional Figure 23:
Jet delay contribution from the $\beta $ of the gluino is plotted against the delay contribution from the difference (assuming straight line paths) between the path taken by the gluino and the particle forming the jet from the path length for a particle travelling directly to the same position on the ECAL barrel for gluino $ {c\tau _{0}} = $ 10 m and mass of 1000 GeV (a) and 3000 GeV (b). The dominant contribution is shown to the gluino $\beta $. |
png pdf |
Additional Figure 23-a:
Jet delay contribution from the $\beta $ of the gluino is plotted against the delay contribution from the difference (assuming straight line paths) between the path taken by the gluino and the particle forming the jet from the path length for a particle travelling directly to the same position on the ECAL barrel for gluino $ {c\tau _{0}} = $ 10 m and mass of 1000 GeV. The dominant contribution is shown to the gluino $\beta $. |
png pdf |
Additional Figure 23-b:
Jet delay contribution from the $\beta $ of the gluino is plotted against the delay contribution from the difference (assuming straight line paths) between the path taken by the gluino and the particle forming the jet from the path length for a particle travelling directly to the same position on the ECAL barrel for gluino $ {c\tau _{0}} = $ 10 m and mass of 3000 GeV. The dominant contribution is shown to the gluino $\beta $. |
png pdf |
Additional Figure 24:
The 95% CL observed upper limits on $\sigma /\sigma _{\textrm {theory}}$ = 1 in the mass and ${c\tau _{0}}$ plane for the GMSB model after all selections for $137 \textrm {fb}^{-1}$. The contour of 95% CL expected upper limits is shown in the solid line while the plus and minus one sigma variations are shown in the dashed lines. The observed limit is shown in the solid black line. |
| Additional Tables | |
png pdf |
Additional Table 1:
Selection efficiencies for the GMSB model with gluino mass 1000 GeV. |
png pdf |
Additional Table 2:
Selection efficiencies for the GMSB model with gluino mass 2400 GeV. |
png pdf |
Additional Table 3:
Selection efficiencies for the GMSB model with gluino mass 3000 GeV. |
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Compact Muon Solenoid LHC, CERN |
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