Cargando…
Search for New Physics Involving Top Quarks at ATLAS
Two searches for new phenomena involving top quarks are presented: a search for a top partner in ttbar events with large missing transverse momentum, and a search for ttbar resonances in proton-proton collisions at a center-of-mass energy of 7 TeV. The measurements are based on 35 pb^-1 and 200 pb^-...
Autor principal: | |
---|---|
Lenguaje: | eng |
Publicado: |
2011
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1386331 |
_version_ | 1780923219635601408 |
---|---|
author | Golling, Tobias |
author_facet | Golling, Tobias |
author_sort | Golling, Tobias |
collection | CERN |
description | Two searches for new phenomena involving top quarks are presented: a search for a top partner in ttbar events with large missing transverse momentum, and a search for ttbar resonances in proton-proton collisions at a center-of-mass energy of 7 TeV. The measurements are based on 35 pb^-1 and 200 pb^-1 of data collected with the ATLAS detector at the LHC in 2010 and 2011, respectively. No evidence for a signal is observed. The first limits from the LHC are established on the mass of a top partner, excluding a mass of 275 GeV for a neutral particle mass less than 50 GeV and a mass of 300 GeV for a neutral particle mass less than 10 GeV. Using the reconstructed ttbar mass spectrum, limits are set on the production cross-section times branching ratio to ttbar for narrow and wide resonances. For narrow Z' models, the observed 95% C.L. limits range from approximately 38 pb to 3.2 pb for masses going from m_Z' = 500 GeV to m_Z' = 1300 GeV. In Randall-Sundrum models, Kaluza-Klein gluons with masses below 650 GeV are excluded at 95% C.L. |
id | cern-1386331 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2011 |
record_format | invenio |
spelling | cern-13863312019-09-30T06:29:59Zhttp://cds.cern.ch/record/1386331engGolling, TobiasSearch for New Physics Involving Top Quarks at ATLASDetectors and Experimental TechniquesParticle Physics - ExperimentTwo searches for new phenomena involving top quarks are presented: a search for a top partner in ttbar events with large missing transverse momentum, and a search for ttbar resonances in proton-proton collisions at a center-of-mass energy of 7 TeV. The measurements are based on 35 pb^-1 and 200 pb^-1 of data collected with the ATLAS detector at the LHC in 2010 and 2011, respectively. No evidence for a signal is observed. The first limits from the LHC are established on the mass of a top partner, excluding a mass of 275 GeV for a neutral particle mass less than 50 GeV and a mass of 300 GeV for a neutral particle mass less than 10 GeV. Using the reconstructed ttbar mass spectrum, limits are set on the production cross-section times branching ratio to ttbar for narrow and wide resonances. For narrow Z' models, the observed 95% C.L. limits range from approximately 38 pb to 3.2 pb for masses going from m_Z' = 500 GeV to m_Z' = 1300 GeV. In Randall-Sundrum models, Kaluza-Klein gluons with masses below 650 GeV are excluded at 95% C.L.Two searches for new phenomena involving top quarks are presented: a search for a top partner in ttbar events with large missing transverse momentum, and a search for ttbar resonances in proton-proton collisions at a center-of-mass energy of 7 TeV. The measurements are based on 35 pb^-1 and 200 pb^-1 of data collected with the ATLAS detector at the LHC in 2010 and 2011, respectively. No evidence for a signal is observed. The first limits from the LHC are established on the mass of a top partner, excluding a mass of 275 GeV for a neutral particle mass less than 50 GeV and a mass of 300 GeV for a neutral particle mass less than 10 GeV. Using the reconstructed ttbar mass spectrum, limits are set on the production cross-section times branching ratio to ttbar for narrow and wide resonances. For narrow Z' models, the observed 95% C.L. limits range from approximately 38 pb to 3.2 pb for masses going from m_Z' = 500 GeV to m_Z' = 1300 GeV. In Randall-Sundrum models, Kaluza-Klein gluons with masses below 650 GeV are excluded at 95% C.L.arXiv:1109.6734oai:cds.cern.ch:13863312011-10-03 |
spellingShingle | Detectors and Experimental Techniques Particle Physics - Experiment Golling, Tobias Search for New Physics Involving Top Quarks at ATLAS |
title | Search for New Physics Involving Top Quarks at ATLAS |
title_full | Search for New Physics Involving Top Quarks at ATLAS |
title_fullStr | Search for New Physics Involving Top Quarks at ATLAS |
title_full_unstemmed | Search for New Physics Involving Top Quarks at ATLAS |
title_short | Search for New Physics Involving Top Quarks at ATLAS |
title_sort | search for new physics involving top quarks at atlas |
topic | Detectors and Experimental Techniques Particle Physics - Experiment |
url | http://cds.cern.ch/record/1386331 |
work_keys_str_mv | AT gollingtobias searchfornewphysicsinvolvingtopquarksatatlas |