Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP11(2014)118
Keywords
Hadron-Hadron Scattering; proton-proton scattering; supersymmetry; top squark
Categories
Funding
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- CONICYT, Chile
- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
- MSMT CR, Czech Republic
- MPO CR, Czech Republic
- VSC CR, Czech Republic
- DNRF, Denmark
- DNSRC, Denmark
- Lundbeck Foundation, Denmark
- EPLANET, European Union
- NSRF, European Union
- IN2P3-CNRS, France
- CEA-DSM/IRFU, France
- GNSF, Georgia
- BMBF, Germany
- DFG, Germany
- HGF, Germany
- MPG, Germany
- AvH Foundation, Germany
- GSRT, Greece
- NSRF, Greece
- ISF, Israel
- MINERVA, Israel
- GIF, Israel
- I-CORE, Israel
- Benoziyo Center, Israel
- INFN, Italy
- MEXT, Japan
- JSPS, Japan
- CNRST, Morocco
- FOM, Netherlands
- NWO, Netherlands
- BRF, Norway
- RCN, Norway
- MNiSW, Poland
- NCN, Poland
- GRICES, Portugal
- FCT, Portugal
- MNE/IFA, Romania
- MES of Russia
- ROSATOM, Russian Federation
- JINR
- MSTD, Serbia
- MSSR, Slovakia
- ARRS, Slovenia
- MIZS, Slovenia
- DST/NRF, South Africa
- MINECO, Spain
- SRC, Sweden
- Wallenberg Foundation, Sweden
- SER, Switzerland
- SNSF, Switzerland
- Cantons of Bern, Switzerland
- Geneva, Switzerland
- NSC, Taiwan
- TAEK, Turkey
- STFC, United Kingdom
- Royal Society, United Kingdom
- Leverhulme Trust, United Kingdom
- DOE, United States of America
- NSF, United States of America
- Science and Technology Facilities Council [ST/M001733/1, ST/J00474X/1 ATLAS Upgrades, PP/E000444/1, ST/G006717/1, GRIDPP, ST/M002306/1, ST/L001179/1 ATLAS Upgrade, ST/I006056/1 ATLAS Upgrade, ST/I006056/1 ATLAS Upgrades, ST/J005487/1, ST/L003511/1, ST/K001426/1 ATLAS, ST/K00140X/1, ST/H001085/2, ST/K001329/1, ATLAS, ST/K001418/1, ST/I006056/1, ST/M001504/1, ST/L003414/1, ST/L001179/1, ST/K00137X/1, ST/L001209/1 ATLAS Upgrades, ST/I00372X/1 GRIDPP, ST/H001069/2, ST/M007103/1 ATLAS Upgrades, PP/E002846/1, ST/I00372X/1, ST/J00474X/1, ST/L00352X/1, ST/K001302/1, ST/K001264/1 ATLAS, ST/M000761/1, ST/K001248/1, ST/G50228X/1, ST/M002306/1 ATLAS Upgrades, ST/I000178/1, ST/M002071/1 ATLAS Upgrades, PP/D002915/1, ST/J005525/1, ST/M001474/1, ST/L001179/1 ATLAS Upgrades, ST/L006480/1] Funding Source: researchfish
- ICREA Funding Source: Custom
- STFC [PP/D002915/1, PP/E002846/1, ST/L006480/1, ST/I006056/1, ST/K00137X/1, ST/K001248/1, ST/G50228X/1, ST/K001329/1, ST/M001733/1, ST/I000178/1, ST/G006717/1, ST/H001069/2, ST/M000761/1, ST/L00352X/1, ST/M002306/1, ST/L003511/1, ST/K001302/1, ST/K00140X/1, ST/M001504/1, ST/J00474X/1, ST/H001085/2, ST/J005525/1, ST/J005487/1, ST/L003414/1, ST/L001179/1, ST/I00372X/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [1119200] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [13J07426] Funding Source: KAKEN
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The results of a search for top squark (stop) pair production in final states with one isolated lepton, jets, and missing transverse momentum are reported. The analysis is performed with proton-proton collision data at root s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20 fb(-1). The lightest supersymmetric particle (LSP) is taken to be the lightest neutralino which only interacts weakly and is assumed to be stable. The stop decay modes considered are those to a top quark and the LSP as well as to a bottom quark and the lightest chargino, where the chargino decays to the LSP by emitting a W boson. A wide range of scenarios with different mass splittings between the stop, the lightest neutralino and the lightest chargino are considered, including cases where the W bosons or the top quarks are off-shell. Decay modes involving the heavier charginos and neutralinos are addressed using a set of phenomenological models of supersymmetry. No significant excess over the Standard Model prediction is observed. A stop with a mass between 210 and 640 GeV decaying directly to a top quark and a massless LSP is excluded at 95% confidence level, and in models where the mass of the lightest chargino is twice that of the LSP, stops are excluded at 95% confidence level up to a mass of 500 GeV for an LSP mass in the range of 100 to 150 GeV. Stringent exclusion limits are also derived for all other stop decay modes considered, and model-independent upper limits are set on the visible cross-section for processes beyond the Standard Model.
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