  W bosons can be produced in the channels e+- p -> W+- + X at HERA thus
allowing to probe for anomalous trilinear couplings among the gauge bosons. We
discuss the NLO QCD corrections to the photoproduction of W bosons with finite
transverse momentum at HERA. The higher-order QCD corrections reduce the
factorization scale dependence significantly and modify the leading order cross
sections by +-O(10%).

High Energy Physics - Phenomenology;High Energy Physics - Experiment