Soft ridge in proton-proton collisions
  It is shown that the soft mechanism of multiparticle production by Lund hadronic strings formed by colliding constituent degrees of freedom generates a shape of angular correlations similar to the ridge structure observed in the pp collisions at 7 TeV at the LHC. 
M.Yu. Azarkin, I.M. Dremin, A.V. Leonidov
hep-ph nucl-th