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Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at vs=8 TeV with the ATLAS detector

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posted on 2023-06-09, 03:41 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, C T Potter, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, et al. The Atlas Collaboration
The angular distributions of Drell-Yan charged lepton pairs in the vicinity of the Z-boson mass peak probe the underlying QCD dynamics of Z-boson production. This paper presents a measurement of the complete set of angular coefficients A0-7 describing these distributions in the Z-boson Collins-Soper frame. The data analysed correspond to 20.3 fb-1 of pp collisions at sv=8s=8 TeV, collected by the ATLAS detector at the CERN LHC. The measurements are compared to the most precise fixed-order calculations currently available (O(a2s))(O(as2)) and with theoretical predictions embedded in Monte Carlo generators. The measurements are precise enough to probe QCD corrections beyond the formal accuracy of these calculations and to provide discrimination between different parton-shower models. A significant deviation from the (O(a2s))(O(as2)) predictions is observed for A0 - A2. Evidence is found for non-zero A5,6,7, consistent with expectations.

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Publication status

  • Published

File Version

  • Published version

Journal

Journal of High Energy Physics

ISSN

1029-8479

Publisher

Springer Verlag

Volume

159

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-10-25

First Open Access (FOA) Date

2016-10-25

First Compliant Deposit (FCD) Date

2016-10-24

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