Search for heavy long-lived multi-charged particles in the full LHC Run 2 $pp$ collision data at $\sqrt{s}$ = 13 TeV using the ATLAS detector

The ATLAS collaboration
Phys.Lett.B 847 (2023) 138316, 2023.

Abstract (data abstract)
CERN-LHC. Search for heavy long-lived multi-charged particles in the full LHC Run 2 proton-proton collision data at $\sqrt{s}$ = 13 TeV using the ATLAS detector A search for heavy long-lived multi-charged particles is performed using the ATLAS detector at the LHC. Data collected in 2015--2018 at $\sqrt{s}$ = 13 TeV from proton-proton collisions corresponding to an integrated luminosity of 139 fb$^{-1}$ are examined. Particles producing anomalously high ionization, consistent with long-lived spin-1/2 massive particles with electric charges from $|q|=2e$ to $|q|=7e$ are searched for. No statistically significant evidence of such particles is observed, and 95% confidence level cross-section upper limits are calculated and interpreted as the lower mass limits for a Drell-Yan plus photon-fusion production mode. The least stringent limit, 1060 GeV, is obtained for $|q|=2e$ particles, and the most stringent one, 1600 GeV, is for $|q|=6e$ particles.

  • Table 1

    Data from Figure 5(a)

    10.17182/hepdata.135815.v1/t1

    The signal efficiencies for spin-1/2 MCPs with different charges and masses for the DY+PF production mode versus their mass.

  • Table 2

    Data from Figure 8

    10.17182/hepdata.135815.v1/t2

    Observed 95% CL cross-section upper limits as a function of the muon-like spin-1/2 MCP's mass for the DY+PF production mode.

  • Table 3

    Data from Table 1 of the auxiliary material

    10.17182/hepdata.135815.v1/t3

    Cutflow (sum of weights of events satisfying cumulative selection requirements) for several signal benchmark points. Event counts are scaled by...

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