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Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdelalim, A. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, P. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akesson, TPA and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2013) Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector. PHYSICS LETTERS B, 720 (1-3). pp. 32-51. ISSN 0370-2693

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Abstract

A measurement of angular correlations in Drell–Yan lepton pairs via the φ∗ η observable is presented. This variable probes the same physics as the Z/γ∗ boson transverse momentum with a better experi- mental resolution. The Z/γ∗ → e+e− and Z/γ∗ → μ+μ− decays produced in proton–proton collisions at a centre-of-mass energy of √s = 7 TeV are used. The data were collected with the ATLAS detec- tor at the LHC and correspond to an integrated luminosity of 4.6 fb−1. Normalised differential cross sections as a function of φ∗ η are measured separately for electron and muon decay channels. These channels are then combined for improved accuracy. The cross section is also measured double dif- ferentially as a function of φ∗ η for three independent bins of the Z boson rapidity. The results are compared to QCD calculations and to predictions from different Monte Carlo event generators. The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations or by some Monte Carlo event generators. The measurement precision is typically better by one order of magnitude than present theoretical uncertainties.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 05 Jun 2024 14:35
Last Modified: 05 Jun 2024 14:35
URI: https://real.mtak.hu/id/eprint/196630

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