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

0465696 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Aad, G. - Abbott, B. - Abdallah, J. - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … celkem 2833 autorů
Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at √s=8 TeV with the ATLAS detector.
Journal of High Energy Physics. Roč. 2016, č. 8 (2016), s. 1-101, č. článku 159. ISSN 1029-8479. E-ISSN 1029-8479
Institucionální podpora: RVO:68378271
Klíčová slova: hadron-hadron scattering * Monte Carlo * electron * CERN Lab * lepton * pair production * experimental results * 8000 GeV-cms
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 6.063, rok: 2016

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 s√=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(α2s)) 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(α2s)) predictions is observed for A0 − A2. Evidence is found for non-zero A5,6,7, consistent with expectations.
Trvalý link: http://hdl.handle.net/11104/0264144