Электронный каталог

Статья

Aad, G.
A Precise Measurement of the Z-Boson Double-Differential Transverse Momentum and Rapidity Distributions in the Full Phase Space of the Decay Leptons with the ATLAS Experiment at *%s=8 TeV / G.Aad, F.Ahmadov, I.N.Aleksandrov, V.A.Bednyakov, I.R.Boyko, G.A.Chelkov, A.Cheplakov, M.V.Chizhov, D.V.Dedovich, M.Demichev, A.Gongadze, M.I.Gostkin, S.N.Karpov, Z.M.Karpova, U.Kruchonak, V.Kukhtin, E.Ladygin, V.Lyubushkin, T.Lyubushkina, S.Malyukov, M.Mineev, E.Plotnikova, I.N.Potrap, N.A.Rusakovich, M.Shiyakova, A.Soloshenko, S.Turchikhin, T.Turtuvshin, I.Yeletskikh, A.Zhemchugov, N.I.Zimine, Y.Kulchitsky, N.Huseynov, [ATLAS Collab.] // The European Physical Journal C [Electronic resource]. – 2024. – Vol. 84, No. 3. – P. 315. – URL: https://doi.org/10.1140/epjc/s10052-024-12438-w. – Bibliogr.: 71.

This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements per- formed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at √s = 8 TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb−1 . The results, based on a total of 15.3 million Z - boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z -boson decay. The double-differential cross- section distributions in Z -boson transverse momentum pT and rapidity y are measured in the pole region, defined as 80 < m&sup(ll) < 100 GeV, over the range |y| < 3.6. The total uncertainty of the normalised cross-section measurements in the peak region of the pT distribution is dominated by sta- tistical uncertainties over the full range and increases as a function of rapidity from 0.5–1.0% for |y| < 2.0 to 2 − 7% at higher rapidities. The results for the rapidity-dependent transverse momentum distributions are compared to state- of-the-art QCD predictions, which combine in the best cases approximate N4 LL resummation with N 3 LO fixed-order per- turbative calculations. The differential rapidity distributions integrated over pT are even more precise, with accuracies from 0.2–0.3% for |y| < 2.0 to 0.4–0.9% at higher rapidi- ties, and are compared to fixed-order QCD predictions using the most recent parton distribution functions. The agreement between data and predictions is quite good in most cases.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
Спец.(статьи,препринты) = С 346.6е2 - Промежуточные бозоны