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Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at $\sqrt(s)$=8  TeV with the ATLAS detector

The ATLAS collaboration
Phys.Rev. D88 (2013) 112006, 2013

Abstract (data abstract)
CERN-LHC. A search is presented for direct chargino production based on a disappearing-track signature using 20.3 fb^-1 of proton-proton collisions at sqrt(s) = 8 TeV collected in 2012 with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass-degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 ns and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.

  • Table 1

    Data from Figure 5

    10.17182/hepdata.62699.v1/t1

    The pT distribution of disappearing-track candidates.

  • Table 2

    Data from Figure 6

    10.17182/hepdata.62699.v1/t2

    Observed CLs contour in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5 and mu > 0.

  • Table 3

    Data from Figure 6

    10.17182/hepdata.62699.v1/t3

    Observed CLs contour with minus 1-sigma signal cross-section uncertainty in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5...

  • Table 4

    Data from Figure 6

    10.17182/hepdata.62699.v1/t4

    Observed CLs contour with plus 1-sigma signal cross-section uncertainty in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5...

  • Table 5

    Data from Figure 6

    10.17182/hepdata.62699.v1/t5

    Expected CLs contour in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5 and mu > 0.

  • Table 6

    Data from Figure 6

    10.17182/hepdata.62699.v1/t6

    Expected CLs contour with minus 1-sigma experimental uncertainty in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5 and...

  • Table 7

    Data from Figure 6

    10.17182/hepdata.62699.v1/t7

    Expected CLs contour with plus 1-sigma experimental uncertainty in the ( M(CHARGINO), TAU(CHARGINO) ) space for tan(beta) = 5 and...

  • Table 8

    Data from Figure 7

    10.17182/hepdata.62699.v1/t8

    Observed CLs contour in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model for tan(beta) = 5 and mu...

  • Table 9

    Data from Figure 7

    10.17182/hepdata.62699.v1/t9

    Observed CLs contour with minus 1-sigma signal cross-section uncertainty in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model...

  • Table 10

    Data from Figure 7

    10.17182/hepdata.62699.v1/t10

    Observed CLs contour with plus 1-sigma signal cross-section uncertainty in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model...

  • Table 11

    Data from Figure 7

    10.17182/hepdata.62699.v1/t11

    Expected CLs contour in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model for tan(beta) = 5 and mu...

  • Table 12

    Data from Figure 7

    10.17182/hepdata.62699.v1/t12

    Expected CLs contour with minus 1-sigma experimental uncertainty in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model for...

  • Table 13

    Data from Figure 7

    10.17182/hepdata.62699.v1/t13

    Expected CLs contour with plus 1-sigma experimental uncertainty in the ( M(CHARGINO), M(CHARGINO)-M(NEUTRALINO) ) space of the AMSB model for...

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