Combinations of single-top-quark production cross-section measurements and |f$_{LV}$V$_{tb}$| determinations at $ \sqrt{s} $ = 7 and 8 TeV with the ATLAS and CMS experiments

Aaboud, Morad; Aad, Georges; Abbott, Brad; Abbott, Dale Charles; Abdinov, Ovsat; Abed Abud, Adam; Abhayasinghe, Deshan Kavishka; Abidi, Syed Haider; Abouzeid, Ossama; Abraham, Nicola

doi:10.1007/JHEP05(2019)088

Combinations of single-top-quark production cross-section measurements and |f $_{LV}$ V $_{tb}$ | determinations at $\sqrt{s}$ = 7 and 8 TeV with the ATLAS and CMS experiments

ATLAS and
CMS

Collaborations

Feb 19, 2019

81 pages

Published in:

JHEP 05 (2019) 088

Published: May 16, 2019

e-Print:

1902.07158 [hep-ex]

DOI:

10.1007/JHEP05(2019)088

PDG:

\vert

f

_{LV}V_{tb}\vert

Report number:

CERN-EP-2019-005

Experiments:

View in:

reference search82 citations

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Abstract: (Springer)

This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at

\sqrt{s}

= 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb

^{−1}

at

\sqrt{s}

= 7 TeV and 12.2 to 20.3 fb

^{−1}

at

\sqrt{s}

= 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at

\sqrt{s}

= 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at

\sqrt{s}

= 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 ± 1.4 pb at

\sqrt{s}

= 8 TeV. The square of the magnitude of the CKM matrix element V

_{tb}

multiplied by a form factor f

_{LV}

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 |V

_{td}

|, |V

_{ts}

| ≪ |V

_{tb}

|. All the |f

_{LV}

V

_{tb}

|

^{2}

determinations, extracted from individual ratios at

\sqrt{s}

= 7 and 8 TeV, are combined, resulting in |f

_{LV}

V

_{tb}

| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.

Note:

81 pages in total, author list starting page 44, 5 figures, 13 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-16/ and http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-006/

Hadron-Hadron scattering (experiments)
p p: colliding beams
top: single production
channel cross section: measured
p p: scattering
heavy quark: jet
jet: bottom
CKM matrix
ATLAS
CMS

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