Temporal evolution of the quark-gluon plasma. Two ions (colored disks) collide along the beam collision axis (black double arrow). Image (a) shows the time immediately after the collision. The plasma (orange area) shines light (wavy arrows) in all directions, so that a first pulse in the direction of the detector (green semi-circle) is formed. (b) After some time, the inner dynamics of the plasma will cause light to be preferentially radiated perpendicular to the direction of flight of the ions. During this time no light is emitted into the direction of the detector which is placed close to the collision axis. In (c) the plasma radiates again in all directions, so that the second pulse is emitted in the direction of the detector.
MPI for Nuclear Physics
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