Double $J/\psi$ Production at LHCb

The production of \jpsi pairs in $\proton\proton$ collisions at a centre of mass energy of \sqs~=~7~\tev was studied using the \lhcb detector. The cross section was measured in the region of \jpsi transverse momentum \pt~$\in$~[0;10]~\gevc and rapidity $y$~$\in$~[2.0;4.2] using an integrated luminosity of 998~\invpb to be 6.08~$\pm$~0.40~\stat~$\pm$~0.29~\syst~\nb. The differential cross section was measured as a function of the \jpsi pair transverse momentum, the total mass of the \jpsi pair, the difference in rapidity of the \jpsi pair and the difference in azimuthal angle between the \jpsi pair.