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Measurements of fiducial cross-sections for $t\bar{t}$ production with one or two additional b-jets in pp collisions at $\sqrt{s}$ =8 TeV using the ATLAS detector

2016-01-07Journal article Open access
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dc.contributor.authorATLAS collaboration (2857 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorAraque, Juan Pedro
dc.contributor.authorCantrill, Robert
dc.contributor.authorCarvalho, João
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPedro, Rute
dc.contributor.authorPina, João Antonio
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-04T07:49:06Z
dc.date.available2019-02-04T07:49:06Z
dc.date.issued2016-01-07
dc.date.updated2019-02-04T07:49:06Z
dc.description.abstractFiducial cross-sections for $t\bar{t} $ production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb$^{-1}$ of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for $t\bar{t} $ events with at least one additional b-jet is measured to be 950 $\pm $ 70 (stat.)$^{+240-190}$  (syst.) fb in the lepton-plus-jets channel and 50 $\pm $ 10 (stat.)$^{+15-10}$  (syst.) fb in the $e \mu $ channel. The cross-section times branching ratio for events with at least two additional b-jets is measured to be 19.3 $\pm $ 3.5 (stat.) $\pm $ 5.7 (syst.) fb in the dilepton channel ( $e \mu $ ,  $\mu \mu $ , and  ee) using a method based on tight selection criteria, and 13.5 $\pm $ 3.3 (stat.)  $\pm $ 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 $\pm $ 0.33 (stat.) $\pm $ 0.28 (syst.)% for the ratio of $t\bar{t}$ production with two additional b-jets to $t\bar{t}$ production with any two additional jets. All measurements are in good agreement with recent theory predictions.
dc.description.versionPeer Reviewed
dc.identifierEur.Phys.J. C76 (2016) 11; DOI 10.1140/epjc/s10052-015-3852-4
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-015-3852-4
dc.identifier.urihttp://hdl.handle.net/10400.26/26912
dc.language.isoeng
dc.titleMeasurements of fiducial cross-sections for $t\bar{t}$ production with one or two additional b-jets in pp collisions at $\sqrt{s}$ =8 TeV using the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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