W AND Z PRODUCTION IN THE FORWARD REGION AT LHCb

Results are presented on the production of Z -> mu mu and W -> mu v in the forward region at LHCb. The analysis is based on an integrated luminosity of 16.5 +/- 1.7 pb(-1). The production cross-section for Z with muons in the pseudorapidity range 2 < eta(mu) < 4.5 and 81 < m(Z) < 101 GeV is 74 +/- 2 +/- 3 +/- 7 pb and is also measured differentially in rapidity of the Z. The total cross-section for W production is sigma(W+) (2 < eta < 4.5) = 1007 +/- 48 +/- 101 pb and sigma(W)- (2 < eta 4.5) = 680 +/- 40 +/- 68 pb in the lepton pseudorapidity range 2 < eta < 4.5. The charge asymmetry is measured as a function of the lepton pseudorapidity. All results are in agreement with next to leading order perturbative QCD predictions.