Abstract
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Production of third generation squarks via decay of a gluino can be significant if the mass of the gluino does not exceed the TeV scale. Scalar top or bottom squarks with masses less than a few hundred GeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for gluino mediated and direct stop and sbottom pair production.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9] is an extension of the Standard Model (SM) which naturally resolves the hierarchy problem by introducing supersymmetric partners to the known fermions and bosons
The inner detector (ID) tracking system consists of a silicon pixel detector, a silicon microstrip detector (SCT), and a transition radiation tracker (TRT)
For example many top pair production estimates, the background contribution is measured by normalising the Monte Carlo simulation to the number of data events in a dedicated control region which is rich in the background of interest
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9] is an extension of the Standard Model (SM) which naturally resolves the hierarchy problem by introducing supersymmetric partners to the known fermions and bosons. The third generation squarks (stop and sbottom, t, b), could have masses around the TeV scale. In these proceedings, a summary of ATLAS searches for third generation squarks is presented, with emphasis on new results. The analyses are interpreted in a number of different simplified SUSY scenarios stemming from assumptions made regarding the mass spectrum. If the stop and sbottom squarks are heavier than the gluino (g), indirect production is possible. The scenarios considered here assume that the third generation squarks are heavier than the neutralino, such that the reaction pp → gg → ttχ01ttχ, proceeds via an off-shell stop (known as the Gtt scenario). Four models of squark decay modes are considered. The decay t → cχ is considered as the subject of future ATLAS analyses and is not described here
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