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. If the masses of top and bottom squarks are below 1 TeV, the direct pair production cross-section is sufficient to produce observable signatures at the ATLAS detector and to probe various theoretical scenarios with the Large Hadron Collider (LHC) data at √s = 8 TeV. The most recent ATLAS results from searches for direct stop and sbottom pair production are presented in these proceedings. No evidence of deviations from the Standard Model expectation has been observed, and the limits have been set on the masses of the top and bottom squarks.
Highlights
Supersymmetry (SUSY) is an extension of the Standard Model (SM) which predicts the existence of a bosonic/fermionic partner for each known fermion/boson
In the framework of R-parity conserving models, SUSY particles are produced in pairs and the lightest of them (LSP) is stable, providing a dark matter particle candidate
The scalar partners of right-handed and left-handed quarks mix to form two mass eigentstates (q1 and q2). Since this mixing is proportional to the masses of SM quarks, the lightest stop (t1) and sbottom (b1) mass eigenstates can be much lighter than those of other quarks leading to large cross-sections at the Large Hadron Collider (LHC)
Summary
Supersymmetry (SUSY) is an extension of the Standard Model (SM) which predicts the existence of a bosonic/fermionic partner for each known fermion/boson. By introducing the scalar top quark (t) with mass below the TeV scale, SUSY can naturally resolve the gauge hierarchy problem. The scalar partners of right-handed and left-handed quarks (qR and qL) mix to form two mass eigentstates (q1 and q2) Since this mixing is proportional to the masses of SM quarks, the lightest stop (t1) and sbottom (b1) mass eigenstates can be much lighter than those of other quarks leading to large cross-sections at the LHC. For this reason, ATLAS has an extensive search agenda for third generation SUSY particles which can be produced either directly in pairs (Figure 1) or through gluino-gluino production.
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