Azimuthal asymmetry of direct photons in intermediate energy heavy-ion collisions

Details Azimuthal asymmetry of direct photons in intermediate energy heavy-ion collisions Azimuthal asymmetry of direct photons in intermediate energy heavy-ion collisions

2007-12-03

arxiv.org/abs/0712.0299v2

Phys. Lett. B 663 (2008) 312

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 4 figures; accepted by Physics Letters B

Scientific paper

10.1016/j.physletb.2008.04.037

Hard photon emitted from energetic heavy ion collisions is of very interesting since it does not experience the late-stage nuclear interaction, therefore it is useful to explore the early-stage information of matter phase. In this work, we have presented a first calculation of azimuthal asymmetry, characterized by directed transverse flow parameter $F$ and elliptic asymmetry coefficient $v_2$, for proton-neutron bremsstrahlung hard photons in intermediate energy heavy-ion collisions. The positive $F$ and negative $v_2$ of direct photons are illustrated and they seem to be anti-correlated to the corresponding free proton's flow.

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