Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at √s=13 TeV
A measurement is performed of the cross section of top quark pair production in association with a W or Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1 , collected by the CMS experiment i...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Nature
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/66748/ http://irep.iium.edu.my/66748/ http://irep.iium.edu.my/66748/ http://irep.iium.edu.my/66748/1/66748_Measurement%20of%20the%20cross%20section%20for%20top%20quark%20pair_article.pdf http://irep.iium.edu.my/66748/2/66748_Measurement%20of%20the%20cross%20section%20for%20top%20quark%20pair_scopus.pdf |
| Summary: | A measurement is performed of the cross section of top quark pair production in
association with a W or Z boson using proton-proton collisions at a center-of-mass energy of
13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1
,
collected by the CMS experiment in 2016. The measurement is performed in the same-sign
dilepton, three- and four-lepton final states. The production cross sections are measured
to be σ(t¯tW) = 0.77+0.12
−0.11(stat)+0.13
−0.12(syst) pb and σ(t¯tZ) = 0.99+0.09
−0.08(stat)+0.12
−0.10(syst) pb.
The expected (observed) signal significance for the t¯tW production in same-sign dilepton
channel is found to be 4.5 (5.3) standard deviations, while for the t¯tZ production in threeand
four-lepton channels both the expected and the observed significances are found to
be in excess of 5 standard deviations. The results are in agreement with the standard
model predictions and are used to constrain the Wilson coefficients for eight dimension-six
operators describing new interactions that would modify t¯tW and t¯tZ production. |
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