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Search for long-lived particles using nonprompt jets and missing transverse momentum with proton-proton collisions at $\sqrt{s}=$ 13 TeV

The collaboration
No Journal Information, 2019

Abstract (data abstract)
A search for long-lived particles decaying to displaced, nonprompt jets and missing transverse momentum is presented. The data sample corresponds to an integrated luminosity of 137 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2016--2018. Candidate signal events containing nonprompt 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 with a gluino next-to-lightest supersymmetric particle. In this model, gluino masses up to 2100, 2500, and 1900 GeV are excluded at $95\%$ confidence level for proper decay lengths of 0.3, 1, and 100 m, respectively. These are the best limits to date for such massive gluinos with proper decay lengths greater than $\sim$0.5 m.

• #### Table 2 (predictions)

Contents of Table 2

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Summary of the estimated number of background events.

• #### Figure 2 (Jet time distributions)

Contents of Figure 2.

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The timing distribution of the backgrounds predicted to contribute to the signal region, compared to those for a representative signal...

• #### Figure 3 (2D effs)

Contents of Figure 3.

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The product of the acceptance and efficiency in the $c\tau_{0}$ vs. $m_{\tilde{g}}$ plane for the GMSB model, after all requirements.

• #### Figure 4 (2D obs limits)

Contents of Figure 4.

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The observed upper limits at $95\%$ CL for the gluino pair production cross section in the GMSB model, shown in...

• #### Figure 4 (Contours)

Contents of Figure 4.

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The observed upper limits at $95\%$ CL for the gluino pair production cross section in the GMSB model, shown in...

• #### Figure 5 (limits for $m_\tilde{g} = 2400$ GeV)

Contents of Figure 5.

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The observed and expected upper limits at $95\%$ CL on the gluino pair production cross section for a gluino GMSB...

10.17182/hepdata.90583.v1/t7

The distribution (normalized to unity) of number of ECAL cells hit in the jet for jets in a background enriched...

10.17182/hepdata.90583.v1/t8

The distribution (normalized to unity) of $\mathrm{HEF}$ for a data sample enriched in beam halo and noise jets (satisfying $|\eta|... • #### Additional Figure 3 Contents of Additional Figure 3. 10.17182/hepdata.90583.v1/t9 The distribution (normalized to unity) of$E_{\mathrm{HCAL}}$for a data sample enriched in beam halo and noise jets (satisfying$|\eta|...

10.17182/hepdata.90583.v1/t10

The distribution (normalized to unity) of $t^{\mathrm{RMS}}_\mathrm{jet}/t_{\mathrm{jet}}$ for data sample enriched in jets from noise (satisfying $|\eta| < 1.48$, $p_\mathrm{T}... • #### Additional Figure 5 Contents of Additional Figure 5. 10.17182/hepdata.90583.v1/t11 The distribution (normalized to unity) of$t^{\mathrm{RMS}}_\mathrm{jet}$for data sample enriched in jets from noise (satisfying$|\eta| < 1.48$,$p_\mathrm{T}...

10.17182/hepdata.90583.v1/t12

The distribution (normalized to unity) of $PV_{\rm track}^{\rm fraction}$ for a data sample enriched in main bunch backgrounds (satisfying $p_\mathrm{T}... • #### Additional Figure 7 Contents of Additional Figure 7. 10.17182/hepdata.90583.v1/t13 The distribution (normalized to unity) of$E^{\mathrm{CSC}}_\mathrm{ECAL}/E_{\mathrm{ECAL}}$for a data sample enriched in beam halo (satisfying$p_\mathrm{T} > 30\,\mathrm{GeV}$,$|\eta|...

10.17182/hepdata.90583.v1/t14

The distribution (normalized to unity) of $\mathrm{max}(\Delta \phi_{\mathrm{DT}})$ for a data sample enriched in cosmic muons (satisfying $E^{\mathrm{CSC}}_\mathrm{ECAL}/E_{\mathrm{ECAL}} < 0.8$,...

10.17182/hepdata.90583.v1/t15

The distribution (normalized to unity) of $\mathrm{max}(\Delta \phi_{\mathrm{RPC}})$ for a data sample enriched in cosmic muons (satisfying $E^{\mathrm{CSC}}_\mathrm{ECAL}/E_{\mathrm{ECAL}} < 0.8$,...

• #### Additional Figure 13 (Jet time distributions)

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Distribution of $t_{\mathrm{jet}}$ for jets with the full Run 2 dataset with no cleaning selection applied (a) and after all...