Measurements of the tt¯ production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections
A measurement of the top quark pair production (tt) cross section in proton–proton collisions at the centre-of-mass energy of 8 TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6 fb−1. This analysis is performed in the tt de...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer New York
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63042/ http://irep.iium.edu.my/63042/ http://irep.iium.edu.my/63042/ http://irep.iium.edu.my/63042/1/63042_Measurements%20of%20the%20tt%C2%AF%20production%20cross%20section_article.pdf http://irep.iium.edu.my/63042/2/63042_Measurements%20of%20the%20tt%C2%AF%20production%20cross%20section_scopus.pdf |
| Summary: | A measurement of the top quark pair production
(tt) cross section in proton–proton collisions at the
centre-of-mass energy of 8 TeV is presented using data collected
with the CMS detector at the LHC, corresponding to
an integrated luminosity of 19.6 fb−1. This analysis is performed
in the tt decay channels with one isolated, high transverse
momentum electron or muon and at least four jets,
at least one of which is required to be identified as originating
from hadronization of a b quark. The calibration of
the jet energy scale and the efficiency of b jet identification
are determined from data. The measured tt cross section is
228.5 ± 3.8 (stat) ± 13.7 (syst) ± 6.0 (lumi) pb. This measurement
is compared with an analysis of 7 TeV data, corresponding
to an integrated luminosity of 5.0 fb−1, to determine
the ratio of 8 TeV to 7 TeV cross sections, which is
found to be 1.43 ± 0.04 (stat) ± 0.07 (syst) ± 0.05 (lumi).
The measurements are in agreement with QCD predictions
up to next-to-next-to-leading order. |
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