What does the W transverse momentum distribution say about the W+1 jet/W+0 jet ratio?

We compute the W transverse momentum distribution at large transverse momentum at fixed next-to-leading order (i.e. O ( α 2 s )) and find good agreement with the preliminary measurements reported by DØ . We find that the W transverse momentum distribution is typically significantly larger than the exclusive one-jet rate for a given value of p WT or E jet T , mainly because two or more jet events are excluded. As a consequence, we find that theoretically the W + 1 jet to W + 0 jet ratio R 10 is smaller than the analogous quantity defined in terms of p WT , R W . This hierarchy is preserved under changes of renormalisation/factorisation scales, strong coupling constant and jet algorithm. However, this appears to be in contradiction with the preliminary experimental results which suggest R 10 > R W .