Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2019

Abstract (data abstract)
A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell $W$ and $Z$ bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of sqrt(s) = 13 TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139/fb. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015-2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full dataset are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV.

  • dataMC SR-low mT

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    Distributions in SR-low of the data and post-fit background prediction for m<sub>T</sub>. The SR-low event selections are applied for each...

  • dataMC SR-low Hboost

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    Distributions in SR-low of the data and post-fit background prediction for H<sup>boost</sup>. The SR-low event selections are applied for each...

  • dataMC SR-low meff3L/Hboost

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    Distributions in SR-low of the data and post-fit background prediction for m<sub>eff</sub><sup>3&#8467;</sup>/H<sup>boost</sup>. The SR-low event selections are applied for each...

  • dataMC SR-low pTsoft/(pTsoft+meff3L)

    fig_05d

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    Distributions in SR-low of the data and post-fit background prediction for p<sub>T</sub><sup>soft</sup>/(p<sub>T</sub><sup>soft</sup> + m<sub>eff</sub><sup>3&#8467;</sup>). The SR-low event selections are applied...

  • dataMC SR-ISR mT

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    Distributions in SR-ISR of the data and post-fit background prediction for m<sub>T</sub>. The SR-ISR event selections are applied for each...

  • dataMC SR-ISR R(ETmiss,jets)

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    Distributions in SR-ISR of the data and post-fit background prediction for R(E<sub>T</sub><sup>miss</sup>,jets). The SR-ISR event selections are applied for each...

  • dataMC SR-ISR pTsoft

    fig_06c

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    Distributions in SR-ISR of the data and post-fit background prediction for p<sub>T</sub><sup>soft</sup>. The SR-ISR event selections are applied for each...

  • dataMC SR-ISR pTjets

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    Distributions in SR-ISR of the data and post-fit background prediction for p<sub>T</sub><sup>jets</sup>. The SR-ISR event selections are applied for each...

  • Observed Limit 3LeRJR

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    Observed exclusion contour on C1N2 production assuming on-shell $W/Z$ decays as a function of the C1/N2 and N1 masses, and...

  • Expected Limit 3LeRJR

    fig_07

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    Expected exclusion contour on C1N2 production assuming on-shell $W/Z$ decays as a function of the C1/N2 and N1 masses, and...

  • Observed Limit 3LeRJR (Up)

    fig_07

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    Plus 1$\sigma$ uncertainty, varying the signal cross section within its uncertainty, on the observed exclusion contour on C1N2 production assuming...

  • Observed Limit 3LeRJR (Down)

    fig_07

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    Minus 1$\sigma$ uncertainty, varying the signal cross section within its uncertainty, on the observed exclusion contour on C1N2 production assuming...

  • Expected Limit 3LeRJR (Up)

    fig_07

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    Plus 1$\sigma$ uncertainty, due to uncertainties in the background prediction and experimental uncertainties affecting the signal, on the expected exclusion...

  • Expected Limit 3LeRJR (Down)

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    Minus 1$\sigma$ uncertainty, due to uncertainties in the background prediction and experimental uncertainties affecting the signal, on the expected exclusion...

  • Observed Upper Limits

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    Upper limits on observed wino-bino simplified model signal cross section $\sigma_\text{obs}^\text{95}$.

  • Expected Upper Limits

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    Upper limits on expected wino-bino simplified model signal cross section $\sigma_\text{exp}^\text{95}$.

  • Acceptance SR-low dMgeq100

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    Signal acceptance in SR-low, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} \geq 100$ GeV.

  • Efficiency SR-low dMgeq100

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    Signal efficiency in SR-low, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} \geq 100$ GeV.

  • Acceptance SR-ISR dMgeq100

    figaux_13c

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    Signal acceptance in SR-ISR, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} \geq 100$ GeV.

  • Efficiency SR-ISR dMgeq100

    figaux_13d

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    Signal efficiency in SR-ISR, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} \geq 100$ GeV.

  • Acceptance SR-low dMlt100

    figaux_14a

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    Signal acceptance in SR-low, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} < 100$ GeV.

  • Efficiency SR-low dMlt100

    figaux_14b

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    Signal efficiency in SR-low, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} < 100$ GeV.

  • Acceptance SR-ISR dMlt100

    figaux_14c

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    Signal acceptance in SR-ISR, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} < 100$ GeV.

  • Efficiency SR-ISR dMlt100

    figaux_14d

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    Signal efficiency in SR-ISR, for signals with $m(\widetilde{\chi}^{\pm}_{1}/\widetilde{\chi}^{0}_{2}) - m\widetilde{\chi}^{0}_{1} < 100$ GeV.

  • Yields SR

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    The observed and expected yields after the background-only fit in the SRs. The normalization factors of the $WZ$ sample for...

  • Results SR

    tab_07

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    Summary of the expected background and data yields in $\text{SR-low}$ and $\text{SR-ISR}$. The second and third columns show the data...

  • Upper Limits

    tabaux_01

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    Upper limits on observed (expected) wino-bino simplified model signal cross section $\sigma_\text{obs(exp)}^\text{95}$.

  • Cutflow SR-ISR

    tabaux_02

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    Full list of event selections and MC generator-weighted yields and in $\text{SR-ISR}$ for the main $WZ$ background and a representative...

  • Cutflow SR-low

    tabaux_03

    10.17182/hepdata.91127.v1/t29

    Full list of event selections and MC generator-weighted yields and in $\text{SR-low}$ for the main $WZ$ background and a representative...

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