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Search for long-lived particles decaying to jets with displaced vertices in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The collaboration
CMS-EXO-19-013, 2021.

Abstract (data abstract)
A search is presented for long-lived particles produced in pairs in proton-proton collisions at the LHC operating at a center-of-mass energy of 13 TeV. The data were collected with the CMS detector during the period from 2015 through 2018, and correspond to a total integrated luminosity of 140 $\mathrm{fb}^{-1}$. This search targets pairs of long-lived particles with mean proper decay lengths between 0.1 and 100 mm, each of which decays into at least two quarks that hadronize to jets, resulting in a final state with two displaced vertices. No significant excess of events with two displaced vertices is observed. In the context of $R$-parity violating supersymmetry models, the pair production of long-lived neutralinos, gluinos, and top squarks is excluded at 95% confidence level for cross sections larger than 0.08 fb, masses between 800 and 3000 GeV, and mean proper decay lengths between 1 and 25 mm. Note that the paper provides an appendix with a prescription for applying the results to different models.

• #### Table 1

Data from Table 1

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Event yields in the control regions in data. The ''one-vertex'' events correspond to events containing exactly one vertex with the...

• #### Figure 3

Data from Figure 3

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The distribution of distances between vertices in the $x$-$y$ plane, $d_{\mathrm{VV}}$, for three simulated multijet signals each with a mass...

• #### Figure 4a (left)

Data from Figure 4a (left)

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Multijet signal efficiencies as a function of the signal mass and lifetime for events satisfying all event and vertex requirements,...

• #### Figure 4b (right)

Data from Figure 4b (right)

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Dijet signal efficiencies as a function of the signal mass and lifetime for events satisfying all event and vertex requirements,...

• #### Figure 5

Data from Figure 5

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The distribution of $d_{\mathrm{BV}}$ for $\geq$5-track one-vertex events in data and three simulated multijet signal samples each with a mass...

• #### Figure 6a (upper left)

Data from Figure 6a (upper left)

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Distribution of the $x$-$y$ distances between vertices, $d_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution $d_{\mathrm{VV}}^{\kern 0.15em\mathrm{C}}$ constructed...

• #### Figure 6b (upper right)

Data from Figure 6b (upper right)

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Distribution of the $x$-$y$ distances between vertices, $d_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution $d_{\mathrm{VV}}^{\kern 0.15em\mathrm{C}}$ constructed...

• #### Figure 6c (lower left)

Data from Figure 6c (lower left)

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Distribution of the $x$-$y$ distances between vertices, $d_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution $d_{\mathrm{VV}}^{\kern 0.15em\mathrm{C}}$ constructed...

• #### Figure 6d (lower right)

Data from Figure 6d (lower right)

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Distribution of the $x$-$y$ distances between vertices, $d_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution $d_{\mathrm{VV}}^{\kern 0.15em\mathrm{C}}$ constructed...

• #### Table 4

Data from Table 4

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Predicted yields for the background-only normalized template, predicted yields for three simulated multijet signals each with a mass of 1600...

• #### Figure 7a (left), grid of limit values

Data from Figure 7a (left), grid of limit values

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Observed 95% CL upper limits on the product of cross section and branching fraction squared for the multijet signals, as...

• #### Figure 7a (left), gluino exclusion curve

Data from Figure 7a (left), gluino exclusion curve

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Observed 95% CL upper limits on the product of cross section and branching fraction squared for the multijet signals, as...

• #### Figure 7a (left), neutralino exclusion curve

Data from Figure 7a (left), neutralino exclusion curve

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Observed 95% CL upper limits on the product of cross section and branching fraction squared for the multijet signals, as...

• #### Figure 7b (right), grid of limit values

Data from Figure 7b (right), grid of limit values

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Observed 95% CL upper limits on the product of cross section and branching fraction squared for the dijet signals, as...

• #### Figure 7b (right), top squark exclusion curve

Data from Figure 7b (right), top squark exclusion curve

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Observed 95% CL upper limits on the product of cross section and branching fraction squared for the dijet signals, as...

• #### Figure 8a (upper left)

Data from Figure 8a (upper left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 8b (upper right)

Data from Figure 8b (upper right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 8c (middle left)

Data from Figure 8c (middle left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 8d (middle right)

Data from Figure 8d (middle right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 8e (lower left)

Data from Figure 8e (lower left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 8f (lower right)

Data from Figure 8f (lower right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9a (upper left)

Data from Figure 9a (upper left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9b (upper right)

Data from Figure 9b (upper right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9c (middle left)

Data from Figure 9c (middle left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9d (middle right)

Data from Figure 9d (middle right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9e (lower left)

Data from Figure 9e (lower left)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Figure 9f (lower right)

Data from Figure 9f (lower right)

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Observed and expected 95% CL upper limits on the product of cross section and branching fraction squared, as a function...

• #### Table 5

Data from Table 5

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Data-to-simulation efficiency correction factors for simulated signal events with pairs of long-lived particles, shown for multijet and dijet signal topologies...

• #### Figure A1

Data from Figure A1

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Distribution of the azimuthal angle between vertices, $\Delta\phi_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution constructed from 3-track...

• #### Figure A2

Data from Figure A2

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Distribution of the azimuthal angle between vertices, $\Delta\phi_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution constructed from 4-track...

• #### Figure A3

Data from Figure A3

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Distribution of the azimuthal angle between vertices, $\Delta\phi_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution constructed from 4-track...

• #### Figure A4

Data from Figure A4

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Distribution of the azimuthal angle between vertices, $\Delta\phi_{\mathrm{VV}}$, for 2017 and 2018 data with a background distribution constructed from $\geq$5-track...

Version 2 modifications: Updated the links to the CDS and arxiv versions of the paper (under additional resources).