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Abbott, B.; Anders, C. F.; Barklow, T.; Biesuz, N. V.; Boyd, J.; Bruneliere, R.; Burgard, C. D.; Cakir, O.; Camarri, P.; Chafaq, A.; Chalupkova, I.; Cheplakov, A.; Cheremushkina, E.; Chiarelli, G.; Connell, S. H.; Costanzo, D.; Crescioli, F.; Cribbs, W. A.; David, C.; Dedovich, D. V.; Del Peso, J.; Delmastro, M.; Di Mattia, A.; Djobava, T.; Djuvsland, J. I.; Dolgoshein, B. A.; Donati, S.; Feng, H.; Flaschel, N.; Fukunaga, C.; Gazis, E. N.; Gingrich, D. M.; Gornicki, E.; Hervas, L.; Hong, T. M.; Horii, Y.; Hrabovsky, M.; Huth, J.; Ioannou, P.; Iordanidou, K.; Istin, S.; Jackson, B.; Jansky, R.; Javadov, N.; Jorge, P. M.; Kagan, M.; Kashif, L.; Klein, M.; Koletsou, I.; Kruchonak, U.; Kuehn, S.; Lacuesta, V. R.; Laforge, B.; Le Guirriec, E.; Lemmer, B.; Li, L.; Lin, S. C.; Mader, W. F.; Manjarres Ramos, J.; McCarthy, T. G.; Metcalfe, J.; Mikenberg, G.; Moa, T.; Morii, M.; Morvaj, L.; Nomachi, M.; Nooney, T.; Oakham, F. G.; Panitkin, S.; Pantea, D.; Parodi, F.; Piacquadio, G.; Pianori, E.; Picazio, A.; Prell, S.; Rauscher, F.; Riu, I.; Ros, E.; Royon, C. R.; Rubinskiy, I.; Ryabov, Y. F.; Rybar, M.; Sadrozinski, H. F.-W.; Sasaki, Y.; Sato, K.; Sciolla, G.; Sidiropoulou, O.; Snidero, G.; Sommer, P.; Sundermann, J. E.; Tafirout, R.; Tannenwald, B. B.; Thompson, E. N.; Ueno, R.; van Gemmeren, P.; Vorobev, K.; Washbrook, A.; Werner, P.; Wiik-Fuchs, L. A. M.; Wozniak, K. W.
The European physical journal. C, Particles and fields, 05/2016, Letnik: 76, Številka: 5Journal Article
Distributions of transverse momentum p T ℓ ℓ and the related angular variable ϕ η ∗ of DrellΓÇôYan lepton pairs are measured in 20.3┬áfb - 1 of protonΓÇôproton collisions at s = 8 ┬áTeV 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 protonΓÇôproton collisions at s = 7 ┬áTeV, 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 ϕ η ∗ < 1 the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕ η ∗ 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 p T ℓ ℓ while the fixed-order prediction of Dynnlo falls below the data at high values of p T ℓ ℓ . ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕ η ∗ and p T ℓ ℓ distributions as a function of lepton-pair mass and rapidity than the basic shape of the data.
