Pair production of J/psi as a probe of double parton scattering at LHCb
  We argue that the recent LHCb observation of J/psi-pair production indicates a significant contribution from double parton scattering, in addition to the standard single parton scattering component. We propose a method to measure the double parton scattering at LHCb using leptonic final states from the decay of two prompt J/psi mesons. 
C. H. Kom, A. Kulesza, W. J. Stirling
hep-ph hep-ex