Influence of tubular initial conditions on two-particle correlations
  A unified description of the near-side and away-side structures observed in two-particle correlations as function of delta eta-delta phi is proposed for low to moderate transverse momentum. It is based on the combined effect of tubular initial conditions and hydrodynamical expansion. 
R.P.G.Andrade, F.Gardim, F.Grassi, Y.Hama and W.L.Qian
nucl-th hep-ph