Electroweak corrections to large transverse momentum production of W bosons at the LHC

To match the precision of present and future measurements of W-boson production at hadron colliders, electroweak radiative corrections must be included in the theory predictions. In this Letter we consider their effect on the transverse momentum (PT) distribution of W bosons, with emphasis on large PT. We evaluate the full electroweak O(alpha) corrections to the process pp -> Wj including virtual and real photonic contributions. We also provide compact approximate expressions which are valid in the high-energy region, where the electroweak corrections W. These expressions include quadratic and single logarithms at one loop as well as quartic and are strongly enhanced by logarithms of s/M-w(2) triple logarithms at two loops. Numerical results are presented for proton-proton collisions at 14 TeV. The corrections are negative and their size increases with PT. At the LHC, where transverse momenta of 2 TeV or more can be reached, the one-and two-loop corrections amount up to -40% and +10%, respectively. Q 2007 Published by Elsevier B.V.