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 or around one TeV can also give rise to direct pair production rates at the Large Hadron Collider (LHC) that can be observed in the data sample recorded by the ATLAS detector. This document presents recent ATLAS results from searches for direct top and bottom squark pair production considering both R-parity conserving and R-parity violating scenarios, using the data collected during the LHC Run 2 at a centre-of-mass energy of √s = 13 TeV.
Highlights
Supersymmetry (SUSY) [1] is one of the most attractive extensions of the Standard Model (SM) of particle physics
This document summarizes the ATLAS [13] search p√rogram for third-generation squarks performed during Large Hadron Collider (LHC) Run 2 at a centre-of-mass energy of s = 13 TeV
For mt1 < mW + mχ01, where mt1 is the mass of the t1, mW is the mass of the W boson and mχ01 is the mass of the χ01, either a 4-body decay into a b-quark jet, two distinct fermions f and f and a neutralino or a flavour-changing neutral current (FCNC) process with a charm quark (t1 → cχ01) occurs, which is targeted by the 1- and 2-lepton final state analyses
Summary
Supersymmetry (SUSY) [1] is one of the most attractive extensions of the Standard Model (SM) of particle physics. It can resolve the gauge hierarchy problem [2,3,4,5] by introducing supersymmetric partners of the known bosons and fermions and extending the Higgs boson sector to 5 Higgs bosons, whose superpartners mix together with the electroweak gauginos to the neutralinos and charginos. Naturalness arguments favour the third-generation squarks to be the lightest colored supersymmetric particles [11, 12], i.e. their masses should be in the TeV range and directly accessible at the Large Hadron Collider (LHC) at CERN. The datasets used by the analyses mentioned in this document comprise an integrated luminosity of 36.1 fb−1 and 36.7 fb−1 from 2015 and 2016 depending on the data quality requirements
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