On the transverse momentum distribution of massive lepton pairs

The experimentally measured q_t distributions of massive lepton pairs produced in hadron collisions are compared with the predictions of QCD [1]. We demonstrate that a fair agreement may be achieved without the use of large transverse momenta of the constitunt quarks - owing to a specific double-logarithmic form factor which manifests itself in this process. A prediction for the q_t distribution in weak intermediate boson production is also given.