Journal article
Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector
The journal of high energy physics, Vol.2014(11), 118
01/01/2014
DOI: 10.1007/JHEP11(2014)118
Abstract
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 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.
Details
- Title: Subtitle
- Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector
- Creators
- Georges Aad - Aix-Marseille UniversitéBrad Abbott - University of OklahomaJalal Abdallah - Academia SinicaSamah Abdel KhalekOvsat Bahram Oglu AbdinovRosemarie Aben - University of AmsterdamBabak Abi - Oklahoma State UniversityMaris Abolins - Michigan State UniversityHass AbouzeidHalina Abramowicz - Tel Aviv UniversityTrygve Buanes - University of BergenØrjan DaleGerald EigenAlex KastanasWolfgang LiebigAnna LipniackaBertrand Martin Dit LatourPeter Lundgaard RosendahlHeidi SandakerTherese B SjursenLillian SmestadBjarne StuguMaren UglandLars Bugge - University of OsloMagnar Kopangen Bugge - University of OsloDavid Gordon Cameron - University of OsloJames Richard Catmore - University of OsloZofia CzyczulaLaura FranconiBørge Kile GjelstenEirik GramstadFarid Ould-SaadaKatarina PajchelMaiken PedersenAlexander Lincoln ReadOle Myren RøhneSteinar StapnesAre StrandlieHenso Abreu - Technion – Israel Institute of TechnologyRômulo F Abreu - CERNLeszek Adamczyk - AGH University of KrakowDavid Adams - Brookhaven National LaboratoryJareed Adelman - Yale UniversityStefanie Adomeit - Ludwig-Maximilians-Universität MünchenTim Adye - Rutherford Appleton LaboratoryTatjana Agatonovic-JovinJuan Antonio Aguilar SaavedraHenrik Åkerstedt - Stockholm UniversityTorsten P. A Åkesson - Lund UniversityBarbro Åsman - Stockholm UniversityATLAS Collaboration
- Contributors
- U Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- The journal of high energy physics, Vol.2014(11), 118
- DOI
- 10.1007/JHEP11(2014)118
- ISSN
- 1126-6708
- eISSN
- 1029-8479
- Publisher
- Institute of Physics Publishing (IOPP)
- Language
- English
- Date published
- 01/01/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199752902771
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