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

Abstract

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(α) 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 are strongly enhanced by logarithms of sˆ/MW2. These expressions include quadratic and single logarithms at one loop as well as quartic and 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.