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Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at $ \sqrt{s}=8 $ TeV

The ATLAS collaboration
JHEP 1501 (2015) 068, 2015

Abstract (data abstract)
CERN-LHC. Searches for heavy long-lived charged particles are performed using a data sample of 19.8 fb$^{-1}$ from proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the Large Hadron Collider. No excess is observed above the estimated background and limits are placed on the mass of long-lived particles in various supersymmetric models. Long-lived tau sleptons in models with gauge-mediated symmetry breaking are excluded up to masses between 440 and 385 GeV for $\tan\beta$ between 10 and 50, with a 290 GeV limit in the case where only direct tau slepton production is considered. In the context of simplified LeptoSUSY models, where sleptons are stable and have a mass of 300 GeV, squark and gluino masses are excluded up to a mass of 1500 and 1360 GeV, respectively. Directly produced charginos, in simplified models where they are nearly degenerate to the lightest neutralino, are excluded up to a mass of 620 GeV. $R$-hadrons, composites containing a gluino, bottom squark or top squark, are excluded up to a mass of 1270, 845 and 900 GeV, respectively, using the full detector; and up to a mass of 1260, 835 and 870 GeV using an approach disregarding information from the muon spectrometer.

  • Table 1

    Data from Figure 2a

    10.17182/hepdata.66462.v1/t1

    Observed data, background estimate and expected signal in the slepton search for the lower of the two masses ($m$) in...

  • Table 2

    Data from Figure 2b

    10.17182/hepdata.66462.v1/t2

    Observed data, background estimate and expected signal in the slepton search for the lower of the two masses ($m$) in...

  • Table 3

    Data from Figure 2c

    10.17182/hepdata.66462.v1/t3

    Observed data, background estimate and expected signal in the slepton search for the one-candidate signal region (LeptoSUSY: $m_{\tilde q}$ =...

  • Table 4

    Data from Figure 3a

    10.17182/hepdata.66462.v1/t4

    Reconstructed mass $m_\beta$ in observed data, background estimate and expected signal ($\tilde{\chi}^{\pm}_1$ masses of 400 and 600 GeV) in the...

  • Table 5

    Data from Figure 3b

    10.17182/hepdata.66462.v1/t5

    Reconstructed mass $m_\beta$ in observed data, background estimate and expected signal ($\tilde{\chi}^{\pm}_1$ masses of 400 and 600 GeV) in the...

  • Table 6

    Data from Figure 3c

    10.17182/hepdata.66462.v1/t6

    Reconstructed mass $m_\beta$ in observed data, background estimate and expected signal ($\tilde{\chi}^{\pm}_1$ masses of 400 and 600 GeV) in the...

  • Table 7

    Data from Figure 4a

    10.17182/hepdata.66462.v1/t7

    Data and background estimates for the reconstructed mass based on time-of-flight, $m_{\beta}$, for combined candidates in the full-detector 500 GeV...

  • Table 8

    Data from Figure 4b

    10.17182/hepdata.66462.v1/t8

    Data and background estimates for the reconstructed mass based on specific energy loss, $m_{\beta\gamma}$, for combined candidates in the full-detector...

  • Table 9

    Data from Figure 4c

    10.17182/hepdata.66462.v1/t9

    Data and background estimates for the reconstructed mass based on time-of-flight, $m_{\beta}$, for the MS-agnostic 500 GeV sbottom and $m_{\beta\gamma}$...

  • Table 10

    Data from Figure 4d

    10.17182/hepdata.66462.v1/t10

    Data and background estimates for the reconstructed mass based on specific energy loss, $m_{\beta\gamma}$, for the MS-agnostic 500 GeV stop...

  • Table 11

    Data from Figure 5a

    10.17182/hepdata.66462.v1/t11

    Cross-section upper limits as a function of the mass of the lightest stau for the GMSB models with $\tan\beta =...

  • Table 12

    Data from Figure 5b

    10.17182/hepdata.66462.v1/t12

    Cross-section upper limits as a function of the mass of the lightest stau for the GMSB models with $\tan\beta =...

  • Table 13

    Data from Figure 5c

    10.17182/hepdata.66462.v1/t13

    Cross-section upper limits as a function of the mass of the lightest stau for the GMSB models with $\tan\beta =...

  • Table 14

    Data from Figure 5d

    10.17182/hepdata.66462.v1/t14

    Cross-section upper limits as a function of the mass of the lightest stau for the GMSB models with $\tan\beta =...

  • Table 15

    Data from Figure 5e

    10.17182/hepdata.66462.v1/t15

    Cross-section upper limits as a function of the mass of the lightest stau for the GMSB models with $\tan\beta =...

  • Table 16

    Data from Figure 6a

    10.17182/hepdata.66462.v1/t16

    Observed 95% CL exclusion contour for directly produced sleptons in the plane $\Delta=m(\tilde{\ell})-m(\tilde{\tau}_1)$ vs. $m(\tilde{\tau}_1)$.

  • Table 17

    Data from Figure 6a

    10.17182/hepdata.66462.v1/t17

    Expected 95% CL exclusion contour for directly produced sleptons in the plane $\Delta=m(\tilde{\ell})-m(\tilde{\tau}_1)$ vs. $m(\tilde{\tau}_1)$.

  • Table 18

    Data from Figure 7a

    10.17182/hepdata.66462.v1/t18

    Cross-section upper limits as a function of the $\tilde{\tau}_1$ mass for direct $\tilde{\tau}_1$ production and three values of $\tan\beta$. Expected...

  • Table 19

    Data from Figure 8a

    10.17182/hepdata.66462.v1/t19

    Cross-section upper limits as a function of the $\tilde{\chi}_1$ mass for $\tilde{\tau}_1$ sleptons resulting from the decay of directly produced...

  • Table 20

    Data from Figure 9a

    10.17182/hepdata.66462.v1/t20

    Observed 95% CL exclusion contour for the LeptoSUSY model.

  • Table 21

    Data from Figure 9a

    10.17182/hepdata.66462.v1/t21

    Expected 95% CL exclusion contour for the LeptoSUSY model.

  • Table 22

    Data from Figure 10a

    10.17182/hepdata.66462.v1/t22

    Cross-section upper limits for various chargino masses in stable-chargino models. Expected limit with $\pm 1\sigma$ and $\pm 2\sigma$ uncertainties, observed...

  • Table 23

    Data from Figure 11a

    10.17182/hepdata.66462.v1/t23

    Cross-section upper limits as a function of the LLP mass for the gluino R-Hadron models for the MS-agnostic search. Expected...

  • Table 24

    Data from Figure 11b

    10.17182/hepdata.66462.v1/t24

    Cross-section upper limits as a function of the LLP mass for the gluino R-Hadron models for the full-detector search. Expected...

  • Table 25

    Data from Figure 11c

    10.17182/hepdata.66462.v1/t25

    Cross-section upper limits as a function of the LLP mass for the sbottom R-Hadron models for the MS-agnostic search. Expected...

  • Table 26

    Data from Figure 11d

    10.17182/hepdata.66462.v1/t26

    Cross-section upper limits as a function of the LLP mass for the sbottom R-Hadron models for the full-detector search. Expected...

  • Table 27

    Data from Figure 11e

    10.17182/hepdata.66462.v1/t27

    Cross-section upper limits as a function of the LLP mass for the stop R-Hadron models for the MS-agnostic search. Expected...

  • Table 28

    Data from Figure 11f

    10.17182/hepdata.66462.v1/t28

    Cross-section upper limits as a function of the LLP mass for the stop R-Hadron models for the full-detector search. Expected...

  • Table 29

    Data from Table 2

    10.17182/hepdata.66462.v1/t29

    Summary of systematic uncertainties for the slepton searches (given in percent). Ranges indicate a mass dependence for the given uncertainty...

  • Table 30

    Data from Table 3

    10.17182/hepdata.66462.v1/t30

    Summary of systematic uncertainties for the chargino and R-Hadron searches (given in percent). Ranges indicate a mass dependence for the...

  • Table 31

    Data from Table 4

    10.17182/hepdata.66462.v1/t31

    Observed and expected event yields, as well as efficiencies and uncertainties for three MC simulation signal samples, in the two...

  • Table 32

    Data from Table 5

    10.17182/hepdata.66462.v1/t32

    Observed and expected event yields, as well as efficiencies and uncertainties for three MC simulation signal samples, in the three...

  • Table 33

    Data from Table 6

    10.17182/hepdata.66462.v1/t33

    Observed and expected event yields, as well as efficiencies and uncertainties for three MC simulation signal samples, in the three...

  • Table 34

    Data from Table 7

    10.17182/hepdata.66462.v1/t34

    Observed and expected event yields, as well as efficiencies and uncertainties for three MC simulation signal samples, in the R-Hadron...

  • Table 35

    Data from Aux Table 1

    10.17182/hepdata.66462.v1/t35

    Mass of the $\tilde{\tau}_1$; cross-section; minimum $p_T$, maximum $\beta$ and minimum $m_{\beta}$ requirements; expected number of signal events (exp.); signal...

  • Table 36

    Data from Aux Table 2

    10.17182/hepdata.66462.v1/t36

    Mass of the $\tilde{\tau}_1$; cross-section; minimum \pt, maximum $\beta$ and minimum $m_{\beta}$ requirements; expected number of signal events (exp.); signal...

  • Table 37

    Data from Aux Table 3

    10.17182/hepdata.66462.v1/t37

    Masses of the $\tilde{g}$ and $\tilde{q}$; cross-section; minimum \pt, maximum $\beta$ and minimum $m_{\beta}$ requirements; expected number of signal events...

  • Table 38

    Data from Aux Table 4

    10.17182/hepdata.66462.v1/t38

    Slepton search candidate requirements and example candidate selection flow for loose and tight selections.

  • Table 39

    Data from Aux Table 5

    10.17182/hepdata.66462.v1/t39

    Mass of the $\tilde{\chi}^{\pm}_{1}$; cross-section; minimum $p_T$, maximum $\beta$ and minimum $m_{\beta}$ requirements; expected number of signal events (exp.); signal...

  • Table 40

    Data from Aux Table 6

    10.17182/hepdata.66462.v1/t40

    Chargino search candidate requirements and example candidate selection flow for the total production as well as chargino-neutralino (CN) and chargino-pair...

  • Table 41

    Data from Aux Table 7

    10.17182/hepdata.66462.v1/t41

    Mass of the LLP; cross-section; minimum $p$, maximum $\beta\gamma$, maximum $\beta$, minimum $m_{\beta\gamma}$ and minimum $m_{\beta}$ requirements; expected signal (exp.);...

  • Table 42

    Data from Aux Table 8

    10.17182/hepdata.66462.v1/t42

    Mass of the LLP; cross-section; minimum $p$, maximum $\beta\gamma$, maximum $\beta$, minimum $m_{\beta\gamma}$ and minimum $m_{\beta}$ requirements; expected signal (exp.);...

  • Table 43

    Data from Aux Table 9

    10.17182/hepdata.66462.v1/t43

    Muon-agnostic search R-Hadron candidate requirements and example candidate selection flow for ID+calorimeter selection.

  • Table 44

    Data from Aux Table 10

    10.17182/hepdata.66462.v1/t44

    Full-detector search R-Hadron candidate requirements and example candidate selection flow for combined selection.

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