Search for long-lived charginos based on a disappearing-track signature in pp collisions at √s = 13TeV with the ATLAS detector
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Springer International Publishing
Hadron-Hadron scattering (experiments)
Atlas Collaboration.´Search for long-lived charginos based on a disappearing-track signature in pp collisions at √s = 13TeV with the ATLAS detector´. Journal of High Energy Physics, 06 (2018) 022. [doi: 10.1007/JHEP06(2018)022]
SponsorshipArticle funded by SCOAP3.
This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb-1 of pp collisions at √s = 13TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers signi_cantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% con_dence level on the mass of charginos and gluinos for di_erent chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.