Abstract
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. Top or bottom squarks with masses less than a few hundred GeV can also give rise to direct pair production rates at the LHC proton-proton collisions that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for direct stop and sbottom pair production.
Highlights
Background control and ResultsATLAS 450Ldt = 20.1 fb-1, s = 8 TeVObserved limit (±1σtShUeSorYy) Expected limit (±1σexp)EveEnvtesnt/s5/050GGeeVV ∫ 104∫L dt=20.3 fb-1, s=8 TeV ttbar, Z+jets,W+jets : 103 tt CR [SRA]400 DSMataTo2At0a1l2ll-hadronic350 tt Single Top∫L dAt=2T0L.3AfbS-1, s=8 TeV∫tt CRL [dStR=A] 20.1 fb-1, s = 8 TeVYield correction estimated 102 with background enriched 10 ttbar
separate data samples enriched in background or signal
ttW stop signature is very similar to SM ttbar production
Summary
Supersymmetry (SUSY) is a very predictive set of models that describe the SM and beyond SM physics. FCNC supression favors heavy 1st and 2nd generation squarks (lower bounds from LHC > 1 TeV). We have a « recent » observation (mH = 125.5 GeV) Naturalness arguments favor the 3rd generation squarks to be « light » (< 1 TeV). Will be presented final results for direct top/bottom squark pair production searches at the LHC with the full ATLAS 2012 8 TeV dataset (20.3 fb-1)
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