High-Energy Photons from Passage of Jets through Quark-Gluon Plasma

We calculate the production of high-energy photons from Compton scattering and annihilation of a quark jet passing through a quark gluon plasma produced in a relativistic heavy ion collision. The contributions are large and reflect the momentum distribution of the jets and the initial conditions of the plasma.

Figure 1

Spectrum $dN/d^2{p}_{\perp }dy$ of photons at $y=0$ for central collision of gold nuclei at $\sqrt{S_{NN}}=200\mathrm{G}\mathrm{e}\mathrm{V}$ at RHIC. We show the photons from jets interacting with the medium (solid line), direct hard photons (long dashed), bremsstrahlung photons (short dashed), and thermal photons (dotted).

Figure 2

The same as Fig. 1 for central collision of lead nuclei at $\sqrt{S_{NN}}=5.5\mathrm{T}\mathrm{e}\mathrm{V}$ at LHC.