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We show that the colour-singlet contributions to the hadroproduction of J/psiin association with a W boson are sizable, if not dominant over thecolour-octet contributions. They are of two kinds, sg -> J/psi + c + W atalpha^3_S alpha and q q'-bar -> gamma*/Z* W -> J/psi W at order alpha^3. Thesehave not been considered in the literature until now. Our conclusion is thatthe hadroproduction of a J/psi in association with a W boson cannot be claimedas a clean probe of the colour-octet mechanism. The rate are small even at theLHC and it will be very delicate to disentangle the colour-octet contributionsfrom the sizable colour-singlet ones and from the possibly largedouble-parton-scattering contributions. During this analysis, we have alsonoted that, for reactions such as the production of a J/psi by lightquark-antiquark fusion, the colour-singlet contribution via an off-shell photonis of the order of the expectation from the colour-octet contribution via anoff-shell gluon. This is relevant for inclusive production at low energiesclose to the threshold. Such an observation also likely extends to otherprocesses naturally involving light-quark annihilation.

Reassessing the importance of the colour-singlet contributions to direct J/psi+W production at the LHC and the Tevatron