Combined measurement of the t cross section and the b-tagging efficiency using l+jet events with CMS

5th International Workshop on Top Quark Physics

Maes, M.^1

Vrije Universiteit Brussel, Inter-university Institute for High Energies, Brussels, Belgium^1

关键词: B-tagging;    Combined measurements;    Heavy-quark;    Integrated luminosity;    Large amounts;    Large Hadron Collider;    Proton collisions;    Top quarks;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012053/pdf
DOI  :  10.1088/1742-6596/452/1/012053

来源: IOP

【 摘 要 】

The Large Hadron Collider, build at CERN, is the first collider in the world able to act as a top quark factory. The large amounts of top quark events produced allow us to study the properties of this heavy quark in great detail. We propose a combined measurement of the t cross section and the b-tagging efficiency using the lepton+jets event topology observed by the CMS experiment in the 8 TeV proton collisions of the LHC. The data collected in 2012 used for this measurement corresponds to an integrated luminosity of 2.8 fb-1for muon+jets events and 2.7 fb-1for electron+jets events. The obtained t cross section is 228.4 ± 9.0 (stat.)+29.0-26.0 (syst.) ± 10.0 (lumi) pb.