Combinations of single-top-quark production cross-section measurements and |f LV Vtb| determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments
This paper presents the combinations of single-top-quark production crosssection measurements by the ATLAS and CMS Collaborations, using data from LHC proton–proton collisions at √ s = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb−1 at √ s = 7 TeV and 12.2 to 20.3 fb−1 a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Nature
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/79576/ http://irep.iium.edu.my/79576/ http://irep.iium.edu.my/79576/ http://irep.iium.edu.my/79576/1/79576_Combinations%20of%20single-top-quark%20production_article.pdf http://irep.iium.edu.my/79576/2/79576_Combinations%20of%20single-top-quark%20production_scopus.pdf http://irep.iium.edu.my/79576/3/79576_Combinations%20of%20single-top-quark%20production_wos.pdf |
| Summary: | This paper presents the combinations of single-top-quark production crosssection measurements by the ATLAS and CMS Collaborations, using data from LHC
proton–proton collisions at √
s = 7 and 8 TeV corresponding to integrated luminosities
of 1.17 to 5.1 fb−1 at √
s = 7 TeV and 12.2 to 20.3 fb−1 at √
s = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: tchannel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb
and 87.7 ± 5.8 pb at √
s = 7 and 8 TeV respectively. The combined tW cross-sections
are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at √
s = 7 and 8 TeV respectively. For the schannel cross-section, the combination yields 4.9 ± 1.4 pb at √
s = 8 TeV. The square
of the magnitude of the CKM matrix element Vtb multiplied by a form factor fLV is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related
CKM matrix elements obey the relation |Vtd|, |Vts| � |Vtb|. All the |fLVVtb|
2 determinations, extracted from individual ratios at √
s = 7 and 8 TeV, are combined, resulting in
|fLVVtb| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent
with their corresponding Standard Model predictions. |
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