Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two $b$-jets in (pp) collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The collaboration
Eur.Phys.J.C 80 (2020) 691, 2020.

Abstract
The results of a search for electroweakino pair production $pp \rightarrow \tilde\chi^\pm_1 \tilde\chi^0_2$ in which the chargino ($\tilde\chi^\pm_1$) decays into a $W$ boson and the lightest neutralino ($\tilde\chi^0_1$), while the heavier neutralino ($\tilde\chi^0_2$) decays into the Standard Model 125 GeV Higgs boson and a second $\tilde\chi^0_1$ are presented. The signal selection requires a pair of $b$-tagged jets consistent with those from a Higgs boson decay, and either an electron or a muon from the $W$ boson decay, together with missing transverse momentum from the corresponding neutrino and the stable neutralinos. The analysis is based on data corresponding to 139 $\mathrm{fb}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. No statistically significant evidence of an excess of events above the Standard Model expectation is found. Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections. Masses of $\tilde{\chi}^{\pm}_{1}/\tilde{\chi}^{0}_{2}$ up to 740 GeV are excluded at 95% confidence level for a massless $\tilde{\chi}^{0}_{1}$.

• #### dataMC_VR_onLM_nomct

Tabulated data from the publication's Figure 3, VR-onLM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-onLM after all the selection requirements are applied other than...

• #### dataMC_VR_onMM_nomct

Tabulated data from the publication's Figure 3, VR-onMM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-onMM after all the selection requirements are applied other than...

• #### dataMC_VR_onHM_nomct

Tabulated data from the publication's Figure 3, VR-onHM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-onHM after all the selection requirements are applied other than...

• #### dataMC_VR_offLM_nomct

Tabulated data from the publication's Figure 3, VR-offLM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-offLM after all the selection requirements are applied other than...

• #### dataMC_VR_offMM_nomct

Tabulated data from the publication's Figure 3, VR-offMM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-offMM after all the selection requirements are applied other than...

• #### dataMC_VR_offHM_nomct

Tabulated data from the publication's Figure 3, VR-offHM_nomct

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The post-fit $m_{CT}$ distribution is shown in the validation region VR-offHM after all the selection requirements are applied other than...

• #### dataMC_SRHM_mct

Tabulated data from the publication's Figure 5, SR-HM

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The post-fit $m_{CT}$ distribution for SR-HM. The stacked histograms show the expected SM backgrounds. The hatched bands represent the sum...

• #### dataMC_SRMM_mct

Tabulated data from the publication's Figure 5, SR-MM

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The post-fit $m_{CT}$ distribution for SR-MM. The stacked histograms show the expected SM backgrounds. The hatched bands represent the sum...

• #### dataMC_SRLM_mct

Tabulated data from the publication's Figure 5, SR-LM

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The post-fit $m_{CT}$ distribution for SR-LM. The stacked histograms show the expected SM backgrounds. The hatched bands represent the sum...

• #### dataMC_SRHM_nombb

Tabulated data from the publication's auxiliary Figure 2, SR-HMnombb

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The post-fit $m_{bb}$ distribution is shown in the signal region SR-HM after all the selection requirements are applied other than...

• #### dataMC_SRMM_nombb

Tabulated data from the publication's auxiliary Figure 2, SR-MMnombb

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The post-fit $m_{bb}$ distribution is shown in the signal region SR-MM after all the selection requirements are applied other than...

• #### dataMC_SRLM_nombb

Tabulated data from the publication's auxiliary Figure 2, SR-LMnombb

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The post-fit $m_{bb}$ distribution is shown in the signal region SR-LM after all the selection requirements are applied other than...

• #### Observed limit 1lbb

Tabulated data from the publication's Figure 6

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The observed exclusion for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production. Experimental and...

• #### Observed limit 1lbb (Up)

Tabulated data from the publication's Figure 6

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The observed exclusion up limit for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production....

• #### Observed limit 1lbb (Down)

Tabulated data from the publication's Figure 6

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The observed exclusion down limit for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production....

• #### Expected limit 1lbb

Tabulated data from the publication's Figure 6

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The expected exclusion for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production. Experimental and...

• #### Upper limits 1Lbb

Tabulated data from the publication's auxiliary Figure 3

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Upper limits on the cross sections for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_LM

Tabulated data from the publication's auxiliary material Figure 4

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Signal acceptance in SR-LM for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production.

• #### Acc_table_SR_LM_Low_MCT

Tabulated data from the publication's auxiliary material Figure 4

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Signal acceptance in SR-LM low $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_LM_Med_MCT

Tabulated data from the publication's auxiliary material Figure 4

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Signal acceptance in SR-LM med. $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_LM_High_MCT

Tabulated data from the publication's auxiliary material Figure 4

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Signal acceptance in SR-LM high $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_MM

Tabulated data from the publication's auxiliary material Figure 5

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Signal acceptance in SR-MM for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$ production.

• #### Acc_table_SR_MM_Low_MCT

Tabulated data from the publication's auxiliary material Figure 5

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Signal acceptance in SR-MM low $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_MM_Med_MCT

Tabulated data from the publication's auxiliary material Figure 5

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Signal acceptance in SR-MM med. $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_MM_High_MCT

Tabulated data from the publication's auxiliary material Figure 5

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Signal acceptance in SR-MM high $m_{CT}$ for simplified models with $\tilde\chi^\pm_1 \tilde\chi^0_2 \rightarrow Wh\tilde\chi^0_1\tilde\chi^0_1, W \rightarrow l\nu, h \rightarrow b\bar{b}$...

• #### Acc_table_SR_HM

Tabulated data from the publication's auxiliary material Figure 6

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• #### cutflow_SRLM_disc

Tabulated data from the publication's auxiliary Table 11

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Event selection cutflow for a representative signal sample for the discovery SR-LM. The masses of next-lightest-neutralinos and LSPs are reported....

• #### cutflow_SRMM_disc

Tabulated data from the publication's auxiliary Table 12

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Event selection cutflow for a representative signal sample for the discovery SR-MM. The masses of next-lightest-neutralinos and LSPs are reported....

• #### cutflow_SRHM_disc

Tabulated data from the publication's auxiliary Table 13

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Event selection cutflow for a representative signal sample for the discovery SR-HM. The masses of next-lightest-neutralinos and LSPs are reported....

Version 4 modifications: Updated SimpleAnalysis code attached