The gluon field of a fast moving nucleus and the effective langrangian for QCD at high energy

Details The gluon field of a fast moving nucleus and the effective langrangian for QCD at high energy The gluon field of a fast moving nucleus and the effective langrangian for QCD at high energy

1999-02-05

arxiv.org/abs/hep-ph/9902248v2

Phys.Rev. D60 (1999) 054006

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures. v2: eq. 18 corrected, modified discussion of the relation between the standard and the effective lagrangi

Scientific paper

10.1103/PhysRevD.60.054006

Starting from the effective lagrangian for QCD at high energy we calculate the lowest perturbative contributions to the potential of a relativistic nucleus and compare our results to those derived by Kovchegov (see Y.V. Kovchegov, Phys. Rev. {\bf D55}, 5445 (1997)). The results differ already at order g^3 which can be traced to the fact that the meaning of the underlying gluon fields is different. (The effective gluon field we use is a gauge invariant object.) Both approaches should therefore be seen as alternatives, the relative merits of which have to be judged by their phenomenological success.

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