Abstract
A summary of five ATLAS W and Z inclusive measurements are presented, these are a mixture of analyses using the 2010 and 2011 datasets of p s = 7 TeV proton-proton collisions at the LHC. The 2010 data is used to measure the cross sections of the Z, W + and W bosons which are then used with the HERA deep inelastic scattering data to determine the strange quark density of the proton. Three analyses that use 2011 data are shown; a measurement of the forward-backward asymmetry of the Z= boson, from which the e ective weak mixing angle is extracted; a measurement of the angular correlations of Drell-Yan lepton pairs from resonant Z decays; and a measurement of the high mass Drell-Yan di erential cross section.
Highlights
Measurements of electroweak processes, such as those summarised here from ATLAS [1] are important for probing the standard model in the new energy regime of the LHC and improve the theoretical predictions with additional constraints
The uncertainties shown for the theoretical predictions are a convolution of the Parton Distribution Functions (PDFs) uncertainties, considered by the authors of the various PDF sets to correspond to 68% CL, and a residual numerical uncertainty of below 0.5%
The uncertainty on rs is dominated by an experimental uncertainty of ±0.20. This is consistent with no suppression of the strange quark sea at very low x. This value of rs is compared to those obtained from other PDF sets in fig. 4, where it can be seen that only CT10 [12] is in agreement, while ABKM09, NNPDF2.1 [13, 14] and MSTW2008 all have much smaller values of rs
Summary
Measurements of electroweak processes, such as those summarised here from ATLAS [1] are important for probing the standard model in the new energy regime of the LHC and improve the theoretical predictions with additional constraints. The proton Parton Distribution Functions (PDFs) which are extrapolated from the phase space of previous experiments can be constrained by measurements such as these, as clearly seen in sections 2 and 3
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