Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina

doi:10.1007/JHEP09(2014)015

Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

ATLAS

Collaboration

Jun 4, 2014

51 pages

Published in:

JHEP 09 (2014) 015

Published: 2014

e-Print:

1406.1122 [hep-ex]

DOI:

10.1007/JHEP09(2014)015

PDG: R-parity conserving

{{\widetilde{\mathit t}}}

(Stop) mass limit

Report number:

CERN-PH-EP-2014-112

Experiments:

CERN-LHC-ATLAS

View in:

datasets

reference search185 citations

Citations per year

Abstract: (arXiv)

The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of

20.1 \rm{fb}^{-1}

of proton-proton collision data at

\sqrt{s}=8

TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via

\tilde{t} \rightarrow t \tilde{\chi}_{1}^{0}

or

\tilde{t}\rightarrow b\tilde{\chi}_{1}^{\pm} \rightarrow b W^{\left(\ast\right)} \tilde{\chi}_{1}^{0}

, where

\tilde{\chi}_{1}^{0}

(

\tilde{\chi}_{1}^{\pm}

) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully-hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of

\tilde{t} \rightarrow t \tilde{\chi}_{1}^{0}

. For a branching fraction of 100%, top squark masses in the range 270-645 GeV are excluded for

\tilde{\chi}_{1}^{0}

masses below 30 GeV. For a branching fraction of 50% to either

\tilde{t} \rightarrow t \tilde{\chi}_{1}^{0}

or

\tilde{t}\rightarrow b\tilde{\chi}_{1}^{\pm}

, and assuming the

\tilde{\chi}_{1}^{\pm}

mass to be twice the

\tilde{\chi}_{1}^{0}

mass, top squark masses in the range 250-550 GeV are excluded for

\tilde{\chi}_{1}^{0}

masses below 60 GeV.

Note:

34 pages plus author list + cover pages (57 pages total), 9 figures, 12 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-16/

Hadron-Hadron Scattering
Supersymmetry
Top squark
Proton-proton scattering
stop: mass
p p: scattering
stop: pair production
stop: decay modes
standard model: validity test
neutralino: mass: lower limit

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Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at s=8\sqrt{s}=8s​=8 TeV with the ATLAS detector

Citations per year

Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector