Measurement of $W$ and $Z$ production in the forward region with LHCb

We report on measurements of $W$ and $Z$ production in the forward region, using data collected at the LHCb experiment with a centre of mass energy of $\sqrt{s} = 7$ TeV with an integrated luminosity of up to 1 fb$^{−1}$ . $W$ and $Z$ bosons are reconstructed in leptonic decay channels, and their cross-sections determined using data-driven techniques. Results are presented inclusively (within the fiducial region considered), and differentially as a function of boson rapidity ($Z$) and lepton pseudorapidity ($W$ ). The ratio of W to Z production, $W^+ /W^−$ production and the $W$ charge asymmetry (for three lepton $p_T$ thresholds) is also given. All results are compared to NNLO predictions.