Gluon spectrum in the glasma from JIMWLK evolution

Understand

The JIMWLK equation with a "daughter dipole" running coupling is solved numerically starting from an initial condition given by the McLerran-Venugopalan model.

• The resulting Wilson line configurations are then used to compute the spectrum of gluons comprising the glasma inital state of a high energy heavy ion collision.
• The development of a geometrical scaling region makes the spectrum of produced gluons harder.
• Thus the ratio of the mean gluon transverse momentum to the saturation scale grows with energy.