Recasting the ATLAS stop–chargino analysis with CheckMATE
Abstract
We present a CheckMATE recast of the ATLAS 13 TeV high–b–jet search. The implementation is validated by comparing the published stop–chargino cutflow to within the ~10% accuracy required for certified analyses and by replicating the published exclusion contour in the (mt̃, mχ̃1±) plane. Relative to the existing CheckMATE analyses, the new analysis tightens the stop limit to mt̃ = 680–750 GeV for mχ̃1± < 900GeV. Applying the same selection to gluino pair production g̃ → bb̅ χ̃10 excludes mg̃ = 400–900GeV for moderate neutralino masses, demonstrating sensitivity beyond the original RPV topology. Residual gaps at very light χ̃10 or mg̃ ≳ 1 TeV are traced to the analysis's low-ETmiss design, suggesting that a MET-optimised variant could extend the reach. The work provides a robust baseline for future reinterpretations across a wider class of BSM scenarios.
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