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Search for direct pair production of a chargino and a neutralino decaying to the 125 GeV Higgs boson in $\sqrt{s} = 8$  TeV ${pp}$ collisions with the ATLAS detector

The collaboration
Eur.Phys.J. C75 (2015) 208, 2015

Abstract (data abstract)
CERN-LHC. A search is presented for the direct pair production of a chargino and a neutralino $pp\to\tilde{\chi}^\pm_1\tilde{\chi}^0_2$, where the chargino decays to the lightest neutralino and the $W$ boson, $\tilde{\chi}^\pm_1 \to \tilde{\chi}^0_1 (W^{\pm}\to\ell^{\pm}\nu)$, while the neutralino decays to the lightest neutralino and the 125 GeV Higgs boson, $\tilde{\chi}^0_2 \to \tilde{\chi}^0_1 (h\to bb/\gamma\gamma/\ell^{\pm}\nu qq)$. The final states considered for the search have large missing transverse momentum, an isolated electron or muon, and one of the following: either two jets identified as originating from bottom quarks, or two photons, or a second electron or muon with the same electric charge. The analysis is based on 20.3 fb$^{-1}$ of $\sqrt{s}=8$ TeV proton-proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with the Standard Model expectations, and limits are set in the context of a simplified supersymmetric model.

• #### Table 1

Data from Figure 2a

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Distribution of contransverse mass $m_{\rm CT}$ in CRlbb-T, central $m_{bb}$ bin. The background histograms are obtained from the background-only fit,...

• #### Table 2

Data from Figure 2b

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Distribution of contransverse mass $m_{\rm CT}$ in SRlbb-1 and SRlbb-2, $m_{bb}$ sideband. The background histograms are obtained from the background-only...

• #### Table 3

Data from Figure 2c

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Distribution of the transverse mass of the $W$-candidate $m_{\rm T}^{W}$ for the one lepton and two $b$-jets channel in VRlbb-2,...

• #### Table 4

Data from Figure 2d

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Distribution of the transverse mass of the $W$-candidate $m_{\rm T}^{W}$ for the one lepton and two $b$-jets channel in SRlbb-1...

• #### Table 5

Data from Figure 2e

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Distribution of the number of $b$-jets for the one lepton and two $b$-jets channel in SRlbb-1 and SRlbb-2 without the...

• #### Table 6

Data from Figure 2f

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Distribution of the invariant mass of the $b$-jets $m_{bb}$ for the one lepton and two $b$-jets channel in the SRlbb-1...

• #### Table 7

Data from Figure 3a

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Distribution of missing transverse momentum $E_{\rm T}^{\rm miss}$ in the one lepton and two photons signal regions SR$\ell\gamma\gamma$-1 and SR$\ell\gamma\gamma$-2...

• #### Table 8

Data from Figure 3b

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Distribution of the azimuth difference between the $W$ and Higgs boson candidates $\Delta\phi(W,h)$ in the one lepton and two photons...

• #### Table 9

Data from Figure 3c

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Distribution of the transverse mass of the $W$ and photon system $m_{\rm{T}}^{W\gamma_1}$ in the one lepton and two photons signal...

• #### Table 10

Data from Figure 3d

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Distribution of the transverse mass of the $W$ and photon system $m_{\rm{T}}^{W\gamma_2}$ in the one lepton and two photons signal...

• #### Table 11

Data from Figure 4a

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Results of the background-only fit to the diphoton invariant mass, $m_{\gamma\gamma}$, distribution in the one lepton and two photons signal...

• #### Table 12

Data from Figure 4b

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Results of the background-only fit to the diphoton invariant mass, $m_{\gamma\gamma}$, distribution in the one lepton and two photons signal...

• #### Table 13

Data from Figure 4c

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Results of the background-only fit to the diphoton invariant mass, $m_{\gamma\gamma}$, distribution in the one lepton and two photons validation...

• #### Table 14

Data from Figure 4d

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Results of the background-only fit to the diphoton invariant mass, $m_{\gamma\gamma}$, distribution in the one lepton and two photons validation...

• #### Table 15

Data from Figure 5

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Distribution of effective mass $m_{\rm eff}$ in the validation region of the same-sign $e\mu$ channel. This validation region is defined...

• #### Table 16

Data from Figure 6a

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Distribution of effective mass $m_{\rm eff}$ for the same-sign dilepton channel in the signal regions with one jet SR$ll$-1. SR$ll$-1...

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Data from Figure 6b

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Distribution of effective mass $m_{\rm eff}$ for the same-sign dilepton channel in the signal regions with two or three jets...

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Data from Figure 6c

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Distribution of largest transverse mass $m_{\rm T}^{\rm max}$ for the same-sign dilepton channel in the signal regions with one jet...

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Data from Figure 6d

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Distribution of largest transverse mass $m_{\rm T}^{\rm max}$ for the same-sign dilepton channel in the signal regions with two or...

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Data from Figure 6e

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Distribution of invariant mass of lepton and jet $m_{lj}$ for the same-sign dilepton channel in the signal regions with one...

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Data from Figure 6f

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Distribution of invariant mass of lepton and di-jet $m_{ljj}$ for the same-sign dilepton channel in the signal regions with two...

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Data from Figure 7a

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One lepton and two $b$-jets channel: observed and expected 95% CL upper limits on the cross section normalised by the...

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Data from Figure 7b

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One lepton and two photons channel: observed and expected 95% CL upper limits on the cross section normalised by the...

• #### Table 24

Data from Figure 7 c

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Same-sign dilepton channel: observed and expected 95% CL upper limits on the cross section normalised by the simplified model prediction...

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Data from Figure 7d

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Combination: observed and expected 95% CL upper limits on the cross section normalised by the simplified model prediction as a...

• #### Table 26

Data from Figure 8a

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One lepton and two b-jets channel: Expected 95% CL exclusion contour for chargino neutralino production via Wh.

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Data from Figure 8a

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One lepton and two b-jets channel: Observed 95% CL exclusion contour for chargino neutralino production via Wh.

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Data from Figure 8b

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One lepton and two photons channel: Expected 95% CL exclusion contour for chargino neutralino production via Wh.

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Data from Figure 8b

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One lepton and two photons channel: Observed 95% CL exclusion contour for chargino neutralino production via Wh.

• #### Table 30

Data from Figure 8c

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Same-sign dilepton channel: Expected 95% CL exclusion contour for chargino neutralino production via Wh.

• #### Table 31

Data from Figure 8c

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Same-sign dilepton channel: Observed 95% CL exclusion contour for chargino neutralino production via Wh.

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Data from Figure 8d

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Combination: Expected 95% CL exclusion contour for chargino neutralino production via Wh.

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Data from Figure 8d

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Combination: Observed 95% CL exclusion contour for chargino neutralino production via Wh.

• #### Table 34

Data from Figure Aux 1

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Combination: excluded model cross-section at 95% CL IN PB.

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Data from Figure Aux 14a

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Acceptance SR$\ell\gamma\gamma$-1.

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Data from Figure Aux 14b

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Acceptance SR$\ell\gamma\gamma$-2.

• #### Table 37

Data from Figure Aux 15a

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Efficiency SR$\ell\gamma\gamma$-1.

• #### Table 38

Data from Figure Aux 15b

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Efficiency SR$\ell\gamma\gamma$-2.

• #### Table 39

Data from Figure Aux 19a

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$m_{\gamma\gamma}$ distribution in the SR$l\gamma\gamma$-1 region for the full $m_{\gamma\gamma}$ window. The last column (background) is from a simulation-based cross...

• #### Table 40

Data from Figure Aux 19b

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$m_{\gamma\gamma}$ distribution in the SR$l\gamma\gamma$-2 region for the full $m_{\gamma\gamma}$ window. The last column (background) is from a simulation-based cross...

• #### Table 41

Data from Figure Aux 19c

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$m_{\gamma\gamma}$ distribution in the VR$l\gamma\gamma$-1 region for the full $m_{\gamma\gamma}$ window. The last column (background) is from a simulation-based cross...

• #### Table 42

Data from Figure Aux 19d

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$m_{\gamma\gamma}$ distribution in the VR$l\gamma\gamma$-2 region for the full $m_{\gamma\gamma}$ window. The last column (background) is from a simulation-based cross...

• #### Table 43

Data from Figure Aux 4a

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Acceptance for SRlbb-1, central $m_{bb}$ bin.

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Data from Figure Aux 4b

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Acceptance for SRlbb-1, $m_{bb}$ sideband.

• #### Table 45

Data from Figure Aux 4c

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Acceptance for SRlbb-2, central $m_{bb}$ bin.

• #### Table 46

Data from Figure Aux 4d

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Acceptance for SRlbb-2, $m_{bb}$ sideband.

• #### Table 47

Data from Figure Aux 5a

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Efficiency for SRlbb-1, central $m_{bb}$ bin.

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Data from Figure Aux 5b

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Efficiency for SRlbb-1, $m_{bb}$ sideband.

• #### Table 49

Data from Figure Aux 5c

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Efficiency for SRlbb-2, central $m_{bb}$ bin.

• #### Table 50

Data from Figure Aux 5d

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Efficiency for SRlbb-2, $m_{bb}$ sideband.

• #### Table 51

Data from Figure Aux 8a

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Acceptance for the same-sign $ee$ channel with one jet.

• #### Table 52

Data from Figure Aux 8b

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Acceptance for the same-sign $ee$ channel with two or three jets.

• #### Table 53

Data from Figure Aux 8c

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Acceptance for the same-sign $e\mu$ channel with one jet.

• #### Table 54

Data from Figure Aux 8d

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Acceptance for the same-sign $e\mu$ channel with two or three jets.

• #### Table 55

Data from Figure Aux 8e

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Acceptance for the same-sign $\mu\mu$ channel with one jet.

• #### Table 56

Data from Figure Aux 8f

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Acceptance for the same-sign $\mu\mu$ channel with two or three jets.

• #### Table 57

Data from Figure Aux 9a

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Efficiency for the same-sign $ee$ channel with one jet.

• #### Table 58

Data from Figure Aux 9b

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Efficiency for the same-sign $ee$ channel with two or three jets.

• #### Table 59

Data from Figure Aux 9c

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Efficiency for the same-sign $e\mu$ channel with one jet.

• #### Table 60

Data from Figure Aux 9d

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Efficiency for the same-sign $e\mu$ channel with two or three jets.

• #### Table 61

Data from Figure Aux 9e

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Efficiency for the same-sign $\mu\mu$ channel with one jet.

• #### Table 62

Data from Figure Aux 9f

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Efficiency for the same-sign $\mu\mu$ channel with two or three jets.