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Search for long-lived neutral particles produced in $pp$ collisions at $\sqrt{s} = 13$ TeV decaying into displaced hadronic jets in the ATLAS inner detector and muon spectrometer

The collaboration
Phys.Rev.D 101 (2020) 052013, 2020.

Abstract (data abstract)
CERN-LHC. A search is presented for long-lived neutral particles using 33 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data, collected during 2016 by the ATLAS detector at the LHC. This search focuses on a topology in which one long-lived particle decays in the ATLAS inner detector and the other decays in the muon spectrometer. Special techniques are required in order to reconstruct the displaced tracks and vertices in the inner detector and in the muon spectrometer. One event is observed that passes the full event selection, which is consistent with the background estimation. Limits are placed on scalar boson propagators of masses from 125 GeV to 1000 GeV decaying to pairs of hidden sector scalars of masses from 8 GeV to 400 GeV. The limits placed on several low mass scalars extend previous exclusion limits in the range of proper lifetimes from 5 cm to 1 m.

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Data from Figure 3A

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IDVx selection efficiency as a function of the radial decay position for $m_H = 125$ GeV.

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Data from Figure 3B

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IDVx selection efficiency as a function of the radial decay position for $m_s = 50$ GeV.

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Data from Figure 4A

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Observed $CL_S$ limits on $BR$ for $m_H = 125$ GeV.

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Data from Figure 4B

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Observed $CL_S$ limits on $\sigma \times BR$ for $m_{\Phi} = 200-400$ GeV.

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Data from Figure 4C

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Observed $CL_S$ limits on $\sigma \times BR$ for $m_{\Phi} = 600-1000$ GeV.

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Data from Figure 5A

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 15$...

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Data from Figure 5B

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 25$...

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Data from Figure 5C

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 40$...

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Data from Figure 5D

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 55$...

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Data from Figure 6A

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{\Phi} = 200$ GeV, $m_s = 25$...

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Data from Figure 6B

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Combined limits from this analysis (ID) and the CR and MS analyses for $m_{\Phi} = 200$ GeV, $m_s = 50$...

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Data from Auxillary Figure 1A

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Comparison of the IDVx reconstruction and selection efficiency for a Higgs with a mass of 125 GeV decaying to an...

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Data from Auxillary Figure 1B

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Comparison of the IDVx reconstruction and selection efficiency for a Higgs with a mass of 125 GeV decaying to an...

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Data from Auxillary Figure 2A

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Comparison of the IDVx reconstruction and selection efficiency for a $\Phi$ with a mass of 1000 GeV decaying to an...

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Data from Auxillary Figure 2B

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Comparison of the IDVx reconstruction and selection efficiency for a $\Phi$ with a mass of 1000 GeV decaying to an...

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Data from Auxillary Figure 3A

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The IDVx selection efficiency as a function of long-lived particle decay $z$ position for MC signal samples with a 125...

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Data from Auxillary Figure 3B

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The IDVx selection efficiency as a function of long-lived particle decay $z$ position for MC signal samples with mediators of...

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Data from Auxillary Figure 4A

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...

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Data from Auxillary Figure 4B

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...

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Data from Auxillary Figure 4C

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...

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Data from Auxillary Figure 5A

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 5B

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 5C

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 6A

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 6B

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 6C

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The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...

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Data from Auxillary Figure 10A

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$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 8$ GeV.

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Data from Auxillary Figure 10B

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$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 15$ GeV.

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Data from Auxillary Figure 10C

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$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 25$ GeV.

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Data from Auxillary Figure 10D

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$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 40$ GeV.

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Data from Auxillary Figure 10E

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$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 55$ GeV.

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Data from Auxillary Figure 11A

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 8$ GeV.

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Data from Auxillary Figure 11B

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 25$ GeV.

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Data from Auxillary Figure 11C

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 50$ GeV.

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Data from Auxillary Figure 12A

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 400$ GeV, $m_s = 50$ GeV.

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Data from Auxillary Figure 12B

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 400$ GeV, $m_s = 100$ GeV.

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Data from Auxillary Figure 13A

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 600$ GeV, $m_s = 50$ GeV.

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Data from Auxillary Figure 13B

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 600$ GeV, $m_s = 150$ GeV.

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Data from Auxillary Figure 14A

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 50$ GeV.

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Data from Auxillary Figure 14B

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 150$ GeV.

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Data from Auxillary Figure 14C

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$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 400$ GeV.