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In this paper, we investigate consequences of an assumption that the discrepancy of the predicted and observed W^{+}W^{−} production cross sections at the LHC is caused by the missing contribution of the double Drell–Yan process (DDYP). Using our simple model of DDYP [Acta Phys. Pol. B 45, 71 (2014)], we show that inclusion of this production mechanism leads to a satisfactory, parameter-free description of the two-lepton mass distribution for 0-jet W^{+}W^{−} events and the four-lepton mass distribution for \mathit{ZZ} events. In such a scenario, the Higgs-boson contribution is no longer necessary to describe the data. An experimental programme to prove or falsify such an assumption is proposed

On the Contribution of the Double Drell--Yan Process to $WW$ and $ZZ$ Production at the LHC