Abstract
This article presents latest results of the search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √ s = 8TeV pp collisions using L=21 fb −1 of data recorded with the ATLAS detector at the LHC. Two top squark decay scenarios are considered: (a) to a top quark and a long-lived undetected neutral particle (LSP), (b) to a bottom quark and a chargino, where the chargino decays via an on- or off-shell W boson to the LSP. The analysis also employs a new dedicated shape-fit method to target the challenging parameter region where m(˜ t) is close to the kinematic boundary m(t) +m(LSP).
Highlights
Naturalness arguments for weak-scale supersymmetry favour a supersymmetric partner of the top quark with a mass close to its StandardModel counterpart.This article presents a search for directly produced stop pairs, based on a recent conference contribution by the AT-LAS collaboration [1]
The leading two jets are not aligned with ETmiss: ∆φ > 0.8, in order to reduce the impact of fake miss resulting from a possible jet energy mismeasurement
Instead of definining signal and control regions, tN1 is subdivided into 3×5 bins of and mT (W); some more signal-like, others more backgroundlike, an example is shown in figure 2
Summary
Naturalness arguments for weak-scale supersymmetry favour a supersymmetric partner of the top quark (top squark, t, or “stop”) with a mass close to its Standard. This article presents a search for directly produced stop pairs, based on a recent conference contribution by the AT-. Two decay channels are considered separately (figure 1√). The search uses the full 2012 dataset of pp collisions at s = 8 TeV, recorded with the ATLAS detector [2] at the LHC, with an integrated luminosity of 20.7 fb−1. Left- and right-handed top quark each have a supersymmetric partner, tL and tR, which mix to the mass eigenstates t1 and t2.
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