Elliptic Flow arising from Ridges due to Semi-hard Scattering

Details Elliptic Flow arising from Ridges due to Semi-hard Scattering Elliptic Flow arising from Ridges due to Semi-hard Scattering

2007-08-10

arxiv.org/abs/0708.1508v3

Physics

Nuclear Physics

Nuclear Theory

revised version with new title and expanded discussion, to be published in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2008.06.075

Azimuthal anisotropy in heavy-ion collisions is studied by taking into account the ridges generated by semi-hard scattering of intermediate-momentum partons, which can be sensitive to the initial spatial configuration of the medium in non-central collisions. In a simple treatment of the problem where the recombination of only thermal partons is considered, analytical formulas can be derived that yield results in accord with the data on v_2 for p_T <1-2 GeV/c. Centrality dependence is described by a geometrical factor. Ridge phenomenology is used to determine the initial slopes of v_2 at low p_T for both pion and proton. For higher p_T, shower partons from high-p_T jets must be included, but they are not considered here.

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