Cross sections for photons produced in the stopping phase in relativistic heavy-ion collisions

Coherent photon bremsstrahlung and dynamics of heavy-ion collisions: Comparison of different models

“…Ref. [17] that local equilibration is achieved in 10.6 AGeV central Au+Au collisions at t >10 fm/c within a volume of (5 fm) 3 . Apparently, deviations from angular isotropy can be explained by a nonspherical shape of the dense central region elongated in the beam direction [17].…”

“…To understand the sensitivity of photon spectra to the dynamics of a heavy ion collision, it is instructive to compare the predictions of models based on different dynamical scenarios of the collision process. In earlier publications the coherent bremsstrahlung was studied in phenomenological [1][2][3][4][5][6][7][8] as well as microscopical [9] models. In the present paper we concentrate on the comparative analysis of different models, which has not been done in the above mentioned works.…”

Anisotropy of low energy direct photons in relativistic heavy ion collisions

“…Among various mechanisms for producing the direct photons, we can consider bremsstrahlung radiations. This process is usually modeled as classical radiations from the decelerated protons of the incident nuclei [2][3][4][5][6][7][8][9][10][11]. In Ref.…”

“…On the other hand, photons do not suffer from strong interactions, and the so-called direct photons are considered to carry information about the early stages of collisions. Numerous studies in this line have been carried out from the early days of the relativistic heavy ion program [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. See [19] for a recent review on this subject and also the references therein.…”

“…Among the various mechanisms for producing direct photons, we consider bremsstrahlung radiation. This process is usually modeled as classical radiation from the decelerated protons of the incident nuclei [2][3][4][5][6][7][8][9][10][11]. In [20], the authors focused on the behavior of the higher energy (1 GeV) photons, which are dominantly produced by the incoherent sum of the bremsstrahlung radiation from individual decelerated protons, reproducing the spectrum of the observed radiation [21].…”