Abstract
Azimuthal anisotropy is studied by taking into account the ridges created by semi-hard scattering, which is sensitive to the initial spatial configuration in non-central heavy-ion collisions, without requiring rapid thermalization. Phenomenological properties of the bulk and ridge behaviors are used as inputs to determine the elliptic flow of pion and proton at low pT . At intermediate pT the recombination of shower partons with thermal ones becomes more important. The φ dependence of shower partons arises from the variation of the in-medium path length of the hard parton that generates the shower. The pT dependence of v2 is therefore very different at intermediate pT compared to that at low pT . Because of the difference of v2’s for thermal and shower partons, constituent quark number scaling of v2 for hadrons is violated.
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