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https://hdl.handle.net/10316/108547
Título: | Measurement of the transverse momentum and ϕη∗ distributions of Drell–Yan lepton pairs in proton–proton collisions at √ s = 8 TeV with the ATLAS detector | Autor: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Data: | 2016 | Editora: | Springer Nature | Título da revista, periódico, livro ou evento: | European Physical Journal C | Volume: | 76 | Número: | 5 | Resumo: | Distributions of transverse momentum pT ℓℓ and the related angular variable ϕη∗ of Drell–Yan lepton pairs are measured in 20.3fb-1 of proton–proton collisions at √ s = 8 TeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in proton–proton collisions at √ s = 7 TeV, these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z-boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of ϕη∗ < 1 the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕη∗ this is not the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of pT ℓℓ while the fixed-order prediction of Dynnlo falls below the data at high values of pT ℓℓ. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕη∗ and pT ℓℓ distributions as a function of lepton-pair mass and rapidity than the basic shape of the data. | URI: | https://hdl.handle.net/10316/108547 | DOI: | 10.1140/epjc/s10052-016-4070-4 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Física - Artigos em Revistas Internacionais |
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Measurement-of-the-transverse-momentum-and-subsub-distributions-of-DrellYan-lepton-pairs-in-protonproton-collisions-at--s--8-TeV-with-the-ATLAS-detectorEuropean-Physical-Journal-C.pdf | 3.4 MB | Adobe PDF | Ver/Abrir |
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