Search for heavy charged long-lived particles in the ATLAS detector in 31.6 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV

The ATLAS collaboration
No Journal Information, 2019

Abstract (data abstract)
CERN-LHC. Search for heavy charged long-lived particles in the ATLAS detector in 36.1/fb of proton-proton collision data at sqrt(s) = 13 TeV. A search for heavy charged long-lived particles is performed using a data sample of 31.6/fb of proton-proton collisions at sqrt(s) = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. The search is based on observables related to ionization energy loss and time of flight, which are sensitive to the velocity of heavy charged particles traveling significantly slower than the speed of light. Multiple search strategies for a wide range of lifetimes, corresponding to path lengths of a few meters, are defined as model-independently as possible, by referencing several representative physics cases that yield long-lived particles within supersymmetric models, such as gluinos/squarks (R-hadrons), charginos and staus. No significant deviations from the expected Standard Model background are observed. Upper limits at 95% confidence level are provided on the production cross sections of long-lived R-hadrons as well as directly pair-produced staus and charginos. These results translate into lower limits on the masses of long-lived gluino, sbottom and stop R-hadrons, as well as staus and charginos of 2000 GeV, 1250 GeV, 1340 GeV, 430 GeV and 1090 GeV, respectively.

  • Overview

    10.17182/hepdata.86565.v1/t1

    - - - - - - - - Overview of HEPData Record - - - - - - - -...

  • Table 1

    Data from Figure 3 (left)

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    Lower mass requirement for signal regions.

  • Table 2

    Data from Figure 3 (right)

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    Lower mass requirement for signal regions.

  • Table 3

    Data from Figure 8

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    Expected and observed events in the 16 discovery regions along with the according control regions.

  • Table 4

    Data from Table 3

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    Expected signal yield and acceptance x efficiency, estimated background and observed number of events in data for the full range...

  • Table 5

    Data from Table 4

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    Expected signal yield and acceptance x efficiency, estimated background and observed number of events in data for the full range...

  • Table 6

    Data from Table 5

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    p0-values and model-independent upper limits on cross-section x acceptance x efficiency for the 16 discovery regions.

  • Table 7

    Data from Table 6

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    Expected signal yield and acceptance x efficiency, estimated background and observed number of events in data for the full range...

  • Table 8

    Data from Table 7

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    Expected signal yield and acceptance x efficiency, estimated background and observed number of events in data for the full range...

  • Table 9

    Data from Table 8

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    Expected signal yield and acceptance x efficiency, estimated background and observed number of events in data for the full range...

  • Table 10

    Data from Figure 9 (top)

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    Upper cross-section limit in gluino R-hadron search.

  • Table 11

    Data from Figure 9 (bottom-left)

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    Upper cross-section limit in sbottom R-hadron search.

  • Table 12

    Data from Figure 9 (bottom-right)

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    Upper cross-section limit in stop R-hadron search.

  • Table 13

    Data from Figure 10 (left)

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    Upper cross-section limit in stau search.

  • Table 14

    Data from Figure 10 (right)

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    Upper cross-section limit in chargino search.

  • Table 15

    Data from Figure 11

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    Lower mass limit as function of gluino lifetime.

  • Table 16

    Data from auxiliary Table 8

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    Acceptance x efficiency, acceptance and efficiency for the full range of simulated masses in the MS-agnostic R-hadron search.

  • Table 17

    Data from auxiliary Figures 8a, 8b, 8c

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    Upper cross-section limit in meta-stable gluino R-hadron search.

  • Table 18

    Data from auxiliary Figure 9

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    Flavor composition of 800 GeV stop R-hadrons simulated using the generic model as a function of radial distance from the...

  • Table 19

    Data from auxiliary Figure 10

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    Flavor composition of 800 GeV anti-stop R-hadrons simulated using the generic model as a function of radial distance from the...

  • Table 20

    Data from auxiliary Figure 11

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    Flavor composition of 800 GeV stop R-hadrons simulated using the Regge model as a function of radial distance from the...

  • Table 21

    Data from auxiliary Figure 12

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    Flavor composition of 800 GeV anti-stop R-hadrons simulated using the Regge model as a function of radial distance from the...

  • Table 22

    Data from auxiliary Figure 14a

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    ETmiss trigger efficiency as function of true ETmiss (EtmissTurnOn).

  • Table 23

    Data from auxiliary Figure 14b

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    Single-muon trigger efficiency as function of $|\eta|$ and $\beta$ (SingleMuTurnOn).

  • Table 24

    Data from auxiliary Figure 15a

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    Candidate reconstruction efficiency for ID+Calo selection (IDCaloEff).

  • Table 25

    Data from auxiliary Figure 15b

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    Candidate reconstruction efficiency for loose selection (LooseEff).

  • Table 26

    Data from auxiliary Figure 15c

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    Efficiency for a loose candidate to be promoted to a tight candidate (TightPromotionEff).

  • Table 27

    Data from auxiliary Figure 16a

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    Resolution and average of reconstructed dE/dx mass for a given simulated mass for ID+calo candidates.

  • Table 28

    Data from auxiliary Figure 16b

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    Resolution and average of reconstructed ToF mass for a given simulated mass for ID+calo candidates.

  • Table 29

    Data from auxiliary Figure 16c

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    Resolution and average of reconstructed ToF mass for a given simulated mass for FullDet candidates.

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