Search for direct production of electroweakinos in final states with missing transverse momentum and a Higgs boson decaying into photons in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

The ATLAS collaboration
JHEP 10 (2020) 005, 2020.

Abstract (data abstract)
CERN-LHC, ATLAS. A search for a chargino-neutralino pair decaying via the 125 GeV Higgs boson into photons is presented. The study is based on the data collected between 2015 and 2018 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb-1 of pp collisions at a centre-of-mass energy of 13 TeV. No significant excess over the expected background is observed. Upper limits at 95% confidence level for a massless chi01 are set on several electroweakino production cross-sections and the visible cross-section for beyond the Standard Model processes. In the context of simplified supersymmetric models, 95% confidence-level limits of up to 310~GeV in m(chi+-1/chi02)), where m(chi01)=0.5~GeV, are set. Limits at 95% confidence level are also set on the chi+-1chi02 cross-section in the mass plane of m(chi+-/chi02) and m(chi01), and on scenarios with gravitino as the lightest supersymmetric particle. Upper limits at the 95% confidence-level are set on the higgsino production cross-section. Higgsino masses below 380~GeV are excluded for the case of the higgsino fully decaying into a Higgs boson and a gravitino.

  • Figure 8

    Data from FIGURE 8.

    10.17182/hepdata.90017.v1/t1

    The 95% CL model-independent upper limits computed from individual fits in each of 12 categories on the visible cross-section $\sigma_{\mathrm{vis}}^{\mathrm{BSM}}...

  • Figure 9

    Data from FIGURE 9.

    10.17182/hepdata.90017.v1/t2

    Expected and observed 95% CL exclusion upper limits on the production cross-section of $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2} \to W^{\pm}\tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ as a...

  • Figure 10 Observed

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t3

    The observed exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 10 Expected

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t4

    The expected exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 10 +1 Exp $\sigma$

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t5

    The +1 $\sigma$ expected exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 10 -1 Exp $\sigma$

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t6

    The -1 $\sigma$ expected exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 10 +1 Obs $\sigma$

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t7

    The +1 $\sigma$ observed exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 10 -1 Obs $\sigma$

    Data from FIGURE 10.

    10.17182/hepdata.90017.v1/t8

    The -1 $\sigma$ observed exclusion limit contours at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Table 07

    Data from TABLE 07.

    10.17182/hepdata.90017.v1/t9

    The observed and expected exclusion limit at 95% CL for the $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$ production in the $m(\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2})$-$m(\tilde{\chi}^{0}_{1})$ plane.

  • Figure 11

    Data from FIGURE 11.

    10.17182/hepdata.90017.v1/t10

    Expected and observed 95% CL exclusion upper limits on the higgsino production ($\tilde{\chi}\tilde{\chi} \equiv \tilde{\chi}^{0}_{1}\tilde{\chi}^{0}_{2}, \tilde{\chi}^{0}_{1}\tilde{\chi}^{\pm}_{1}, \tilde{\chi}^{0}_{2}\tilde{\chi}^{\pm}_{1}, \tilde{\chi}^{\pm}_{1}\tilde{\chi}^{\mp}_{1}$) cross-section in...

  • Figure 3

    Data from FIGURE 3.

    10.17182/hepdata.90017.v1/t11

    The distribution of $S_{E_\mathrm{T}^{\mathrm{miss}}}$ after the selection of diphoton candidates with $120~GeV < m_{\gamma\gamma} < 130~GeV$. Expected distributions are shown...

  • Auxiliary Table 11

    Auxiliary table 11.

    10.17182/hepdata.90017.v1/t12

    Acceptance and efficiency for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signal in each category.

  • Auxiliary Table 12

    Auxiliary table 12.

    10.17182/hepdata.90017.v1/t13

    Acceptance and efficiency for the $h \tilde{G} h \tilde{G}$ signal in each category.

  • Auxiliary Table 4

    Auxiliary table 4.

    10.17182/hepdata.90017.v1/t14

    Cut flow for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signal sample at $m(\tilde{\chi}^{\pm}_{1} \tilde{\chi}^{0}_{2})=200~GeV$, $m(\tilde{\chi}^{0}_{1})=0.5~GeV$, with 260000 entries.

  • Auxiliary Table 3

    Auxiliary table 3.

    10.17182/hepdata.90017.v1/t15

    Cut flow for the $h \tilde{G} h \tilde{G}$ signal sample at $m(\tilde{\chi}^{0}_{1})=150~GeV$, $m(\tilde{G})=1~MeV$, with 50000 entries.

  • TABLE 4

    TABLE 4

    10.17182/hepdata.90017.v1/t16

    Event yields in the range 120 <$m\gamma\gamma$< 130 GeV for data, signal models, the SM Higgs boson background and non-resonant...

  • Auxiliary table 1

    Auxiliary table 1

    10.17182/hepdata.90017.v1/t17

    Event yields in the range 120 <$m\gamma\gamma$< 130 GeV for data, signal models, the SM Higgs boson background and non-resonant...

  • Auxiliary Figure 2a

    Auxiliary Figure 2a

    10.17182/hepdata.90017.v1/t18

    Acceptance for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the leptonic channel.

  • Auxiliary Figure 2b

    Auxiliary Figure 2b

    10.17182/hepdata.90017.v1/t19

    Efficiency for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the leptonic channel.

  • Auxiliary Figure 2c

    Auxiliary Figure 2c

    10.17182/hepdata.90017.v1/t20

    Acceptance for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the hadronic channel.

  • Auxiliary Figure 2d

    Auxiliary Figure 2d

    10.17182/hepdata.90017.v1/t21

    Efficiency for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the hadronic channel.

  • Auxiliary Figure 2e

    Auxiliary Figure 2e

    10.17182/hepdata.90017.v1/t22

    Acceptance for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the rest channel.

  • Auxiliary Figure 2f

    Auxiliary Figure 2f

    10.17182/hepdata.90017.v1/t23

    Efficiency for the $W^{\pm} \tilde{\chi}^{0}_{1} h \tilde{\chi}^{0}_{1}$ signals in the rest channel.

  • Auxiliary Figure 3a

    Auxiliary Figure 3a

    10.17182/hepdata.90017.v1/t24

    Acceptance for the $h \tilde{G} h \tilde{G}$ signals in the each channel.

  • Auxiliary Figure 3b

    Auxiliary Figure 3b

    10.17182/hepdata.90017.v1/t25

    Efficiency for the $h \tilde{G} h \tilde{G}$ signals in the each channel.

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