Anisotropy of Low Energy Direct Photons in Relativistic Heavy Ion Collisions
Abstract
We investigate the behavior of low energy photons radiated by the deceleration processes of two colliding nuclei in relativistic heavy ion collisions using the Wigner function approach for electromagnetic radiation fields. The angular distribution reveals the information of the initial geometric configurations. Such a property is reflected in the anisotropic parameter v2, showing an increasing v2 as energy decreases, which is a behavior qualitatively different from v2 from hadrons produced in the collisions.
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