10-1016-j-physletb-2016-08-019.pdf (1.45 MB)
Measurement of the View the tt production cross-section using eµ events with b-tagged jets in pp collisions at vs = 13 TeV with the ATLAS detector
journal contribution
posted on 2023-06-09, 03:41 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, C T Potter, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, et al The Atlas DetectorThis paper describes a measurement of the inclusive top quark pair production cross-section (stt¯) with a data sample of 3.2 fb-1 of proton–proton collisions at a centre-of-mass energy of vs = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously stt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: stt¯ = 818 ± 8 (stat) ± 27 (syst) ± 19 (lumi) ± 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented.
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Publication status
- Published
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- Published version
Journal
Physics Letters BISSN
0370-2693Publisher
ElsevierExternal DOI
Volume
761Page range
136-157Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-10-25First Open Access (FOA) Date
2016-10-25First Compliant Deposit (FCD) Date
2016-10-24Usage metrics
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