Maes, M. (2012) Combined measurement of the t¯t cross section and the b-tagging efficiency using μ+jet events. Il nuovo cimento C, 35 (3). pp. 221-224. ISSN 1826-9885
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Abstract
The Large Hadron Collider, built 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¯t cross section and the b-tagging efficiency using the muon+jets event topology observed by the CMS experiment in the 7TeV proton collisions of the LHC. The data collected in 2011 used for this measurement corresponds to an integrated luminosity of 1.1 fb−1. The obtained t¯t cross section is 177.8 ± 11.2 (stat.) ± 50.6 (syst.) ± 11.3 (lumi) pb together with a measured btagging efficiency of 60.3 ± 3.2 (stat.) ± 33.1 (syst.)%. A b-tag algorithm based on the second highest 2D impact parameter significance among all tracks in the jet is applied with a threshold corresponding to a light-flavor mistagging rate of 1%. The result of this crosscheck analysis is in agreement with the main CMS result of 164.4 ± 2.8 (stat.) ± 11.9 (syst.) ± 7.4 (lum.) pb obtained.
| Item Type: | Article |
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| Uncontrolled Keywords: | Top quarks ; Bottom quarks |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 21 Apr 2020 15:34 |
| Last Modified: | 21 Apr 2020 15:34 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17864 |
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