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Measurement of the cross section for t t ¯ production with additional jets and b jets in pp collisions at ?s = 13 TeV

Abstract: Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks (?tt¯bb¯) and in association with a pair of jets from quarks of any flavor or gluons (?tt¯jj) and their ratio are presented. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.9 fb-1. The measurements are performed in a fiducial phase space and extrapolated to the full phase space, separately for the dilepton and lepton+jets channels, where lepton corresponds to either an electron or a muon. The results of the measurements in the fiducial phase space for the dilepton and lepton+jets channels, respectively, are ?tt¯jj = 2.36±0.02 (stat)±0.20 (syst) pb and 31.0±0.2 (stat)±2.9 (syst) pb, and for the cross section ratio 0.017 ± 0.001 (stat) ± 0.001 (syst) and 0.020 ± 0.001 (stat) ± 0.001 (syst). The values of ?tt¯bb¯ are determined from the product of the ?tt¯jj and the cross section ratio, obtaining, respectively, 0.040±0.002 (stat)±0.005 (syst) pb and 0.62±0.03 (stat)±0.07 (syst) pb. These measurements are the most precise to date and are consistent, within the uncertainties, with the standard model expectations obtained using a matrix element calculation at next-to-leading order in quantum chromodynamics matched to a parton shower.

 Fuente: Journal of High Energy Physics, Vol. 2020, Num. 07, Art. Num. 125

 Editorial: Springer Verlag

 Fecha de publicación: 01/07/2020

 Nº de páginas: 46

 Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP07(2020)125

 ISSN: 1126-6708,1029-8479

 Url de la publicación: https://doi.org/10.1007/JHEP07(2020)125