Combinations of single-top-quark production cross-section measurements and vertical bar f(LV)V(tb)vertical bar determinations at root s=7 and 8 TeV with the ATLAS and CMS experiments

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Aaboud2019_Article_CombinationsOFSingle-top-quark.pdf (957.88 KB)

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OA Location

https://link.springer.com/article/10.1007%2FJHEP05(2019)088

Author(s)

Aaboud, M

Aad, G

Abbott, B

Abbott, DC

Abdinov, O

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Type

Journal Article

Abstract

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 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: 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 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 s-channel 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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Date Issued

2019-05-16

Date Acceptance

2019-04-29

Citation

Journal of High Energy Physics, 2019, 2019 (5)

URI

http://hdl.handle.net/10044/1/71297

DOI

10.1007/JHEP05(2019)088

ISSN

1029-8479

Publisher

Springer

Journal / Book Title

Journal of High Energy Physics

Volume

2019

Issue

5

Identifier

http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000468428300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202

Subjects

Science & Technology

Physical Sciences

Physics, Particles & Fields

Physics

Hadron-Hadron scattering (experiments)

PARTON DISTRIBUTIONS

LIKELIHOOD METHOD

MISSING MOMENTUM

RECONSTRUCTION

COLLISIONS

EVENTS

LHC

Publication Status

Published

Article Number

088

Date Publish Online

2019-05-16