Search for supersymmetry in final states with charm jets and missing transverse momentum in 13 TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2018

Abstract (data abstract)
A search for supersymmetric partners of top quarks decaying as $\tilde{t}_1\rightarrow c\tilde{\chi}_1^0$ and supersymmetric partners of charm quarks decaying as $\tilde{c}_1\rightarrow c\tilde{\chi}_1^0$, where $\tilde{\chi}_1^0$ is the lightest neutralino, is presented. The search uses 36.1 fb$^{-1}$ $pp$ collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider and is performed in final states with jets identified as containing charm hadrons. Assuming a 100% branching ratio to $c\tilde{\chi}_1^0$, top and charm squarks with masses up to 850 GeV are excluded at 95% confidence level for a massless lightest neutralino. For $m_{\tilde{t}_1,\tilde{c}_1}-m_{\tilde{\chi}_1^0} < 100$ GeV, top and charm squark masses 1 up to 500 GeV are excluded.

  • Table 1

    Data from Auxiliary Figure 1a.

    10.17182/hepdata.83011.v3/t1

    Acceptance for SR1 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 2

    Data from Auxiliary Figure 1b.

    10.17182/hepdata.83011.v3/t2

    Acceptance for SR2 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 3

    Data from Auxiliary Figure 1c.

    10.17182/hepdata.83011.v3/t3

    Acceptance for SR3 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 4

    Data from Auxiliary Figure 1d.

    10.17182/hepdata.83011.v3/t4

    Acceptance for SR4 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 5

    Data from Auxiliary Figure 1e.

    10.17182/hepdata.83011.v3/t5

    Acceptance for SR5 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 6

    Data from Auxiliary Figure 1f.

    10.17182/hepdata.83011.v3/t6

    Acceptance for best expected CLS SR in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 7

    Data from Auxiliary Figure 2a.

    10.17182/hepdata.83011.v3/t7

    Detector efficiency for SR1 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 8

    Data from Auxiliary Figure 2b.

    10.17182/hepdata.83011.v3/t8

    Detector efficiency for SR2 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 9

    Data from Auxiliary Figure 2c.

    10.17182/hepdata.83011.v3/t9

    Detector efficiency for SR3 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 10

    Data from Auxiliary Figure 2d.

    10.17182/hepdata.83011.v3/t10

    Detector efficiency for SR4 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 11

    Data from Auxiliary Figure 2e.

    10.17182/hepdata.83011.v3/t11

    Detector efficiency for SR5 in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 12

    Data from Auxiliary Figure 2f.

    10.17182/hepdata.83011.v3/t12

    Detector efficiency for best expected CLS SR in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 13

    Data from Figure 6.

    10.17182/hepdata.83011.v3/t13

    Expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 14

    Data from figure 6

    10.17182/hepdata.83011.v3/t14

    Observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 15

    Data from Auxiliary Figure 3a.

    10.17182/hepdata.83011.v3/t15

    SR1 expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 16

    Data from Auxiliary Figure 3a.

    10.17182/hepdata.83011.v3/t16

    SR1 observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 17

    Data from Auxiliary Figure 3b.

    10.17182/hepdata.83011.v3/t17

    SR2 expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 18

    Data from Auxiliary Figure 3b.

    10.17182/hepdata.83011.v3/t18

    SR2 observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 19

    Data from Auxiliary Figure 3c.

    10.17182/hepdata.83011.v3/t19

    SR3 expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 20

    Data from Auxiliary Figure 3c.

    10.17182/hepdata.83011.v3/t20

    SR3 observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 21

    Data from Auxiliary Figure 3d.

    10.17182/hepdata.83011.v3/t21

    SR4 expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 22

    Data from Auxiliary Figure 3d.

    10.17182/hepdata.83011.v3/t22

    SR4 observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 23

    Data from Auxiliary Figure 3e.

    10.17182/hepdata.83011.v3/t23

    SR5 expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 24

    Data from Auxiliary Figure 3e.

    10.17182/hepdata.83011.v3/t24

    SR5 observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane for the stop/scharm pair production scenario.

  • Table 25

    Data from Auxiliary Figure 4a.

    10.17182/hepdata.83011.v3/t25

    Upper limits on signal cross sections and exclusion limits at 95% CL for SR1 in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 26

    Data from Auxiliary Figure 4b.

    10.17182/hepdata.83011.v3/t26

    Upper limits on signal cross sections and exclusion limits at 95% CL for SR2 in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 27

    Data from Auxiliary Figure 4c.

    10.17182/hepdata.83011.v3/t27

    Upper limits on signal cross sections and exclusion limits at 95% CL for SR3 in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 28

    Data from Auxiliary Figure 4d.

    10.17182/hepdata.83011.v3/t28

    Upper limits on signal cross sections and exclusion limits at 95% CL for SR4 in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 29

    Data from Auxiliary Figure 4e.

    10.17182/hepdata.83011.v3/t29

    Upper limits on signal cross sections and exclusion limits at 95% CL for SR5 in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 30

    Data from Auxiliary Figure 4f.

    10.17182/hepdata.83011.v3/t30

    Upper limits on signal cross sections and exclusion limits at 95% CL for the best expected SR in the $m(\tilde...

  • Table 31

    Data from Auxiliary Figure 5.

    10.17182/hepdata.83011.v3/t31

    Minimum branching ratio excluded at 95% CL, assuming no sensitivity for other decay possibilities, in the $m(\tilde t_1/\tilde c_1)$-$m(\tilde\chi^0_1)$ plane...

  • Table 32

    Data from Auxiliary Figure 6.

    10.17182/hepdata.83011.v3/t32

    The signal region with the best expected CLS value for each signal in the $\tilde{t}_1/\tilde{c}_1-\tilde{\chi}_1^0$ mass plane.

  • Table 33

    Data from Auxiliary 18.

    10.17182/hepdata.83011.v3/t33

    Expected exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$\Delta m$ plane for the stop/scharm pair production scenario.

  • Table 34

    Data from Auxiliary 18.

    10.17182/hepdata.83011.v3/t34

    Observed exclusion limit at 95% CL in the $m(\tilde t_1/\tilde c_1)$-$\Delta m$ plane for the stop/scharm pair production scenario.

  • Table 35

    Data from Figure 5a.

    10.17182/hepdata.83011.v3/t35

    Comparison between data and expectation after the background-only fit for the $E_{T}^{miss}$ distribution in SR1. The shaded band indicates detector-related...

  • Table 36

    Data from Figure 5b.

    10.17182/hepdata.83011.v3/t36

    Comparison between data and expectation after the background-only fit for the $E_{T}^{miss}$ distribution in SR2. The shaded band indicates detector-related...

  • Table 37

    Data from Figure 5c.

    10.17182/hepdata.83011.v3/t37

    Comparison between data and expectation after the background-only fit for the $E_{T}^{miss}$ distribution in SR3. The shaded band indicates detector-related...

  • Table 38

    Data from Figure 5d.

    10.17182/hepdata.83011.v3/t38

    Comparison between data and expectation after the background-only fit for the $E_{T}^{miss}$ distribution in SR4. The shaded band indicates detector-related...

  • Table 39

    Data from Figure 5e.

    10.17182/hepdata.83011.v3/t39

    Comparison between data and expectation after the background-only fit for the $E_{T}^{miss}$ distribution in SR5. The shaded band indicates detector-related...

  • Table 40

    Data from Auxiliary Table 1.

    10.17182/hepdata.83011.v3/t40

    Cutflow for the $(m_{\tilde{t}}, m_{\tilde{\chi}}) = (450,425)$ GeV signal point for signal region SR1.

  • Table 41

    Data from Auxiliary Table 2.

    10.17182/hepdata.83011.v3/t41

    Cutflow for the $(m_{\tilde{t}}, m_{\tilde{\chi}}) = (500,420)$ GeV signal point for signal region SR2.

  • Table 42

    Data from Auxiliary Table 3.

    10.17182/hepdata.83011.v3/t42

    Cutflow for the $(m_{\tilde{t}}, m_{\tilde{\chi}}) = (500,350)$ GeV signal point for signal region SR3.

  • Table 43

    Data from Auxiliary Table 4.

    10.17182/hepdata.83011.v3/t43

    Cutflow for the $(m_{\tilde{t}}, m_{\tilde{\chi}}) = (600,350)$ GeV signal point for signal region SR4.

  • Table 44

    Data from Auxiliary Table 5.

    10.17182/hepdata.83011.v3/t44

    Cutflow for the $(m_{\tilde{t}}, m_{\tilde{\chi}}) = (900,1)$ GeV signal point for signal region SR5.

Version 3 modifications: Fix an issue with the detector efficiency numbers.

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