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Measurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

2016-09-13Journal article Open access
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dc.contributor.authorATLAS collaboration (2863 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.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPedro, Rute
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.accessioned2019-02-04T10:34:40Z
dc.date.available2019-02-04T10:34:40Z
dc.date.issued2016-09-13
dc.date.updated2019-02-04T10:34:40Z
dc.description.abstractMeasurements of the jet activity in $ t\overline{t} $ events produced in proton-proton collisions at $ \sqrt{s}=8 $ TeV are presented, using 20.3 fb$^{−1}$ of data collected by the ATLAS experiment at the Large Hadron Collider. The events were selected in the dilepton eμ decay channel with two identified b-jets. The numbers of additional jets for various jet transverse momentum (p$_{T}$) thresholds, and the normalised differential cross-sections as a function of p$_{T}$ for the five highest-p$_{T}$ additional jets, were measured in the jet pseudo-rapidity range |η| < 4.5. The gap fraction, the fraction of events which do not contain an additional jet in a central rapidity region, was measured for several rapidity intervals as a function of the minimum p$_{T}$ of a single jet or the scalar sum of p$_{T}$ of all additional jets. These fractions were also measured in different intervals of the invariant mass of the $ e\mu b\overline{b} $ system. All measurements were corrected for detector effects, and found to be mostly well-described by predictions from next-to-leading-order and leading-order $ t\overline{t} $ event generators with appropriate parameter choices. The results can be used to further optimise the parameters used in such generators.
dc.description.versionPeer Reviewed
dc.identifierJHEP 1609 (2016) 074 JHEP 09 (2016) 074; DOI 10.1007/JHEP09(2016)074
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP09(2016)074
dc.identifier.urihttp://hdl.handle.net/10400.26/27132
dc.language.isoeng
dc.titleMeasurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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