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Two analyses searching for the production of supersymmetric particles throughthe electroweak interaction are presented: the chargino search, targeting thepair production of charginos decaying into W bosons and neutralinos, and thedisplaced track search, looking for charged tracks arising from the decays ofhiggsinos into pions. These searches target compressed phase spaces, where themass difference between the next-to-lightest and lightest supersymmetricparticle is relatively small. The searches use proton-proton collision datacollected at a centre-of-mass energy of 13 TeV with the ATLAS detector at theLHC. In the chargino search, the targeted mass difference between charginos andneutralinos is close to the mass of the W boson. In such phase space, thechargino pair production is kinematically similar to the WW background, makingthe chargino signal experimentally challenging to be discriminated from the WWbackground. Machine learning techniques are adopted to separate thesupersymmetric signal from the backgrounds. The results exclude chargino massesup to about 140 GeV for mass splittings down to about 100 GeV, superseding theprevious results in particularly interesting regions where the chargino pairproduction could have hidden behind the looking-alike WW background. In thedisplaced track search, the mass difference between the produced sparticles andthe lightest neutralinos goes down to 0.3 GeV. The experimental signature has alow momentum charged track with an origin displaced from the collision point.The results show that the analysis has the sensitivity to exclude differenthypotheses for higgsino masses up to 175 GeV if no excess is observed in data.For lower masses, the larger signal cross-section allows to achieve highersignificance for different mass splitting scenarios. All these signalhypotheses have not been probed by any existing analysis of LHC data.

Search for electroweak production of supersymmetric particles in compressed mass spectra with the ATLAS detector at the LHC