Measurements of W ± Z production cross sections in pp collisions at √s =8 TeV with the ATLAS detector and limits on anomalous gauge boson self-couplings

Barton, Adam Edward and Beattie, Michael and Bertram, Iain Alexander and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Cheatham, Susan and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2016) Measurements of W ± Z production cross sections in pp collisions at √s =8  TeV with the ATLAS detector and limits on anomalous gauge boson self-couplings. Physical Review D, 93 (9). ISSN 1550-7998

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Abstract

This paper presents measurements of W ± Z production in pp collisions at a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed using their leptonic decay modes into electrons and muons. The data were collected in 2012 by the ATLAS experiment at the Large Hadron Collider and correspond to an integrated luminosity of 20.3  fb −1 . The measured inclusive cross section in the detector fiducial region is σ W ± Z→ℓ ′ νℓℓ =35.1±0.9(stat)±0.8(sys)±0.8(lumi)  fb , for one leptonic decay channel. In comparison, the next-to-leading-order Standard Model expectation is 30.0±2.1  fb . Cross sections for W + Z and W − Z production and their ratio are presented as well as differential cross sections for several kinematic observables. Limits on anomalous triple gauge boson couplings are derived from the transverse mass spectrum of the W ± Z system. From the analysis of events with a W and a Z boson associated with two or more forward jets an upper limit at 95% confidence level on the W ± Z scattering cross section of 0.63 fb, for each leptonic decay channel, is established, while the Standard Model prediction at next-to-leading order is 0.13±0.01  fb . Limits on anomalous quartic gauge boson couplings are also extracted.

Item Type: Journal Article
Journal or Publication Title: Physical Review D
Departments: Faculty of Science and Technology > Physics
ID Code: 80048
Deposited By: ep_importer_pure
Deposited On: 14 Jun 2016 13:34
Refereed?: Yes
Published?: Published
Last Modified: 17 Oct 2019 00:59
URI: https://eprints.lancs.ac.uk/id/eprint/80048

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