Speaker
Description
Supersymmetry (SUSY) remains one of the most compelling extensions of the Standard Model, offering solutions to the hierarchy problem, dark matter, and gauge coupling unification. The ATLAS experiment at the LHC has conducted a broad and robust search programme for SUSY particles using proton--proton collision data collected during Run 2 at $\sqrt{s}=13$~TeV.
This talk will present a dedicated search for SUSY in models with highly compressed mass spectra, targeting events consistent with vector boson fusion production. The analysis uses $140\,\text{fb}^{-1}$ of data and selects events with at least two jets separated by a large pseudorapidity gap, large missing transverse momentum, and no reconstructed leptons. A boosted decision tree is employed to discriminate the SUSY signal from Standard Model backgrounds. No significant excess is observed, and the results are interpreted in a simplified model with wino-like $\tilde{\chi}_2^0/\tilde{\chi}_1^\pm$ and bino-like $\tilde{\chi}_1^0$. Lower limits at $95\%$ confidence level are set on the masses of the next-to-lightest SUSY partners between $117$ and $120$~GeV when the mass splitting to the lightest SUSY particle is within $1$~GeV, surpassing previous constraints from LEP experiments by approximately $25$~GeV. This analysis closes a challenging region of parameter space that is difficult to probe with conventional soft-lepton searches.
This topic is included in the current MOST project, IHEP contributed to the internal note editor and gave approval talk.
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