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Search for Scalar Charm Quark Pair Production in $pp$ Collisions at $\sqrt{s}=$ 8  TeV with the ATLAS Detector

The ATLAS collaboration
Phys.Rev.Lett. 114 (2015) 161801, 2015

Abstract (data abstract)
CERN-LHC. The results of a dedicated search for pair production of scalar partners of charm quarks are reported. The search is based on an integrated luminosity of 20.3 fb$^{-1}$ of pp collisions at $\sqrt{s}=8$ TeV recorded with the ATLAS detector at the LHC. The search is performed using events with large missing transverse momentum and at least two jets, where the two leading jets are each tagged as originating from c-quarks. Events containing isolated electrons or muons are vetoed. In an R-parity-conserving minimal supersymmetric scenario in which a single scalar-charm state is kinematically accessible, and where it decays exclusively into a charm quark and a neutralino, 95% confidence-level upper limits are obtained in the scalar-charm-neutralino mass plane such that, for neutralino masses below 200 GeV, scalar-charm masses up to 490 GeV are excluded.

  • Table 1

    Data from Figure 1a

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    $m_{CT}$ distribution in signal region (before $m_{CT}$ cuts).

  • Table 2

    Data from Figure 1b

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    $m_{cc}$ distribution in the signal region with $m_{CT}>150$ GeV.

  • Table 3

    Data from Figure 2

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    95% C.L. expected exclusion contour for all regions combined.

  • Table 4

    Data from Figure 2

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    95% C.L. observed exclusion contour for all regions combined.

  • Table 5

    Data from Auxiliary Figure 6

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    Best expected signal region for signal points.

  • Table 6

    Data from Auxiliary Figure 8a

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    95% CLs observed upper limit on model cross-section for signal points in the signal region with $m_{CT}>150$ GeV.

  • Table 7

    Data from Auxiliary Figure 8a

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    95% C.L. expected exclusion contour for the $m_{CT}>150 $ GeV region.

  • Table 8

    Data from Auxiliary Figure 8a

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    95% C.L. observed exclusion contour for the $m_{CT}>150 $ GeV region.

  • Table 9

    Data from Auxiliary Figure 8b

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    95% CLs observed upper limit on model cross-section for signal points in the signal region with $m_{CT}>200$ GeV.

  • Table 10

    Data from Auxiliary Figure 8b

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    95% C.L. expected exclusion contour for the $m_{CT}>200 $ GeV region.

  • Table 11

    Data from Auxiliary Figure 8b

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    95% C.L. observed exclusion contour for the $m_{CT}>200 $ GeV region.

  • Table 12

    Data from Auxiliary Figure 8c

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    95% CLs observed upper limit on model cross-section for signal points in the signal region with $m_{CT}>250$ GeV.

  • Table 13

    Data from Auxiliary Figure 8c

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    95% C.L. expected exclusion contour for the $m_{CT}>250 $ GeV region.

  • Table 14

    Data from Auxiliary Figure 8c

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    95% C.L. observed exclusion contour for the $m_{CT}>250 $ GeV region.

  • Table 15

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    95% CLs upper limit on model cross-section for signal points in C1.

  • Table 16

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    95% CLs upper limit on model cross-section for signal points in C2.

  • Table 17

    Data from Auxiliary Figure 9a

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    Acceptance times Efficiency for signal points in the signal region with $m_{CT}>150$ GeV.

  • Table 18

    Data from Auxiliary Figure 9b

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    Acceptance times Efficiency for signal points in the signal region with $m_{CT}>200$ GeV.

  • Table 19

    Data from Auxiliary Figure 9c

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    Acceptance times Efficiency for signal points in the signal region with $m_{CT}>250$ GeV.

  • Table 20

    Data from Auxiliary Figure 10a

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    Acceptance (flavour-blind) for signal points in the signal region with $m_{CT}>150$ GeV.

  • Table 21

    Data from Auxiliary Figure 10b

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    Acceptance (flavour-blind) for signal points in the signal region with $m_{CT}>200$ GeV.

  • Table 22

    Data from Auxiliary Figure 10c

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    Acceptance (flavour-blind) for signal points in the signal region with $m_{CT}>250$ GeV.

  • Table 23

    Data from Auxiliary Figure 11

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    Signal cross-sections and uncertainties.

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