Repository logo
 
Publication

Search for New Phenomena in $t\bar{t}$ Events With Large Missing Transverse Momentum in Proton-Proton Collisions at $\sqrt{s}=7$ TeV with the ATLAS Detector

2011-09Journal article Open access
Simple item page
dc.contributor.authorATLAS collaboration (3017 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmaral, Pedro
dc.contributor.authorAnjos, Nuno
dc.contributor.authorCarvalho, Joao
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muino, Patricia
dc.contributor.authorDo Valle Wemans, Andre
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGoncalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amelia
dc.contributor.authorManeira, Jose
dc.contributor.authorOliveira, Miguel Alfonso
dc.contributor.authorOnofre, Antonio
dc.contributor.authorPalma, Alberto
dc.contributor.authorPina, Joao Antonio
dc.contributor.authorPinto, Belmiro
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, Joao
dc.contributor.authorSilva, Jose
dc.contributor.authorSoares, Mara
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-03T18:10:06Z
dc.date.available2019-02-03T18:10:06Z
dc.date.issued2011-09
dc.date.updated2019-02-03T18:10:06Z
dc.description.abstractA search for new phenomena in ttbar events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1.04 fb^-1 of data collected with the ATLAS detector at the LHC. The search is carried out in the single-lepton channel, characterized by an isolated lepton of high transverse momentum, four or more jets and large missing transverse momentum. Contributions to this final state may arise from a number of Standard Model extensions. The results are interpreted in terms of a model where new top-quark partners are pair-produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with Standard Model expectations. A limit at 95% confidence level is set excluding a cross-section times branching ratio of 1.1 pb for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top-partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev.Lett. 108 (2012) 041805; DOI 10.1103/PhysRevLett.108.041805
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.108.041805
dc.identifier.urihttp://hdl.handle.net/10400.26/26042
dc.language.isoeng
dc.titleSearch for New Phenomena in $t\bar{t}$ Events With Large Missing Transverse Momentum in Proton-Proton Collisions at $\sqrt{s}=7$ TeV with the ATLAS Detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
1.pdf
Size:
306.04 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.85 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

LIP - AP - Física de Partículas e Astropartículas