Abstract
The electroweak sector of the Standard Model can be tested by precision measurements of its fundamental parameters, such as the W boson mass or the electroweak mixing angle. In this contribution we present the first measurement of the W boson mass, based on the 7 TeV data set corresponding to an integrated luminosity of 4.6 fb-1. With this data set the detector and physics modelling have been studied in great detail, leading to an overall uncertainty of 19 MeV. The ATLAS collaboration also performed a new precise triple differential Z/γ* Drell-Yan cross-section measurement as a function of the dilepton mass, the dilepton rapidity and cos θ* defined in the Collins-Soper frame. This measurement provides sensitivity to the PDFs and the Z forward-backward asymmetry, AFB, which is derived and will be presented. The latter builds the foundation for a possible future extraction of the weak-mixing angle. The production of jets in association with vector bosons is an important process to study perturbative QCD in a multi-scale environment. The ATLAS collaboration has performed new measurements of vector boson plus jets cross sections, differential in several kinematic variables, in proton-proton collision data, taken at center-of-mass energies of 8 TeV and 13 TeV. These measurements are presented and compared to state-of-the art theory predictions. They are sensitive to higher-order pQCD effects, and can be used to constrain the proton structure. In addition, we present a new measurement of the splitting scales of the kt jet-clustering algorithm for final states containing a Z-boson candidate at a centre-of-mass energy of 8 TeV.
Highlights
EPJ Web of Conferences are compared to state-of-the art theory predictions
The triple differential cross section of the Z/γ∗ Drell-Yan production is presented [7] and the forward-backward asymmetry is derived, which forms the base for a future measurement of the electroweak mixing angle
In the context of global fits to the Standard Model (SM) parameters, constraints on physics beyond the SM are currently limited by the W-boson mass measurement precision [9]; 8 MeV is a good target for th√e precision of the measured W mass
Summary
EPJ Web of Conferences are compared to state-of-the art theory predictions. Last, the triple differential cross section of the Z/γ∗ Drell-Yan production is presented [7] and the forward-backward asymmetry is derived, which forms the base for a future measurement of the electroweak mixing angle.
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