The cross sections for the production of t tbar b bbar and t tbar j j events and their ratio σ(t tbar b bbar) / σ(t tbar j j) are measured using data corresponding to an integrated luminosity of 2.3 fb−1collected in pp collisions at √s = 13 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ratio is 0.022 ± 0.003 (stat) ± 0.006 (syst), the cross section σ(t tbar b bbar) is 4.0 ± 0.6 (stat) ± 1.3 (syst) pb and σ(t tbar j j) is 184 ± 6 (stat) ± 33 (syst) pb. The measurements are compared with the standard model expectations obtained from a powheg simulation at next-to-leading-order interfaced with pythia.

Measurements of t tbar cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at √s=13TeV

Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Costa, M.;Covarelli, R.;Kiani, B.;Migliore, E.;Monaco, V.;Monteil, E.;Obertino, M. M.;Pacher, L.;Ravera, F.;Romero, A.;Sacchi, R.;Sola, V.;Solano, A.;
2018-01-01

Abstract

The cross sections for the production of t tbar b bbar and t tbar j j events and their ratio σ(t tbar b bbar) / σ(t tbar j j) are measured using data corresponding to an integrated luminosity of 2.3 fb−1collected in pp collisions at √s = 13 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ratio is 0.022 ± 0.003 (stat) ± 0.006 (syst), the cross section σ(t tbar b bbar) is 4.0 ± 0.6 (stat) ± 1.3 (syst) pb and σ(t tbar j j) is 184 ± 6 (stat) ± 33 (syst) pb. The measurements are compared with the standard model expectations obtained from a powheg simulation at next-to-leading-order interfaced with pythia.
2018
776
355
378
http://www.sciencedirect.com/science/journal/03702693
CMS; Physics; Top quark; Nuclear and High Energy Physics
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Fr...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1663876
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