Measurement of the t(t)over-bar production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at root s=13TeV
A measurement of the top quark–antiquark pair production cross section σtt in proton–proton collisions at a centre-of-mass energy of 13 TeV is presented. The data correspond to an integrated luminosity of 35.9 fb−1, recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events (e±μ∓, μ+...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer New York LLC
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/79896/ http://irep.iium.edu.my/79896/1/79896_Measurement%20of%20the%20tt%20production%20cross%20section_article.pdf http://irep.iium.edu.my/79896/2/79896_Measurement%20of%20the%20tt%20production%20cross%20section_scopus.pdf http://irep.iium.edu.my/79896/3/79896_Measurement%20of%20the%20tt%20production%20cross%20section_wos.pdf |
| Summary: | A measurement of the top quark–antiquark pair
production cross section σtt in proton–proton collisions at a
centre-of-mass energy of 13 TeV is presented. The data correspond to an integrated luminosity of 35.9 fb−1, recorded
by the CMS experiment at the CERN LHC in 2016. Dilepton events (e±μ∓, μ+μ−, e+e−) are selected and the cross
section is measured from a likelihood fit. For a top quark
mass parameter in the simulation of mMC
t = 172.5 GeV the
fit yields a measured cross section σtt = 803 ± 2 (stat) ±
25 (syst) ± 20 (lumi) pb, in agreement with the expectation from the standard model calculation at next-to-next-toleading order. A simultaneous fit of the cross section and
the top quark mass parameter in the powheg simulation
is performed. The measured value of mMC
t = 172.33 ±
0.14 (stat) +0.66 −0.72 (syst) GeV is in good agreement with previous measurements. The resulting cross section is used,
together with the theoretical prediction, to determine the top
quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions. |
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