A Gaussian effective theory for gluon saturation

Details A Gaussian effective theory for gluon saturation A Gaussian effective theory for gluon saturation

2002-12-09

arxiv.org/abs/hep-ph/0212123v1

Nucl.Phys.A724:181-222,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

41 pages, 7 figure

Scientific paper

10.1016/S0375-9474(03)01477-5

We construct a Gaussian approximation to the effective theory for the Colour Glass Condensate which describes correctly the gluon distribution both in the low density regime at high transverse momenta (above the saturation scale $Q_s$), and in the high density regime below $Q_s$, and provides a simple interpolation between these two regimes. At high momenta, the effective theory reproduces the BFKL dynamics, while at low momenta, it exhibits gluon saturation and, related to it, colour neutrality over the short distance scale $1/Q_s \ll 1/\Lambda_{QCD}$. Gauge--invariant quantities computed within this approximation are automatically infrared finite.

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