The static PQCD potential with modified boundary conditions

Details The static PQCD potential with modified boundary conditions The static PQCD potential with modified boundary conditions

2000-11-16

arxiv.org/abs/hep-ph/0011209v2

JHEP 0105:020,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 3 figures, updated version accepted for publication in JHEP, additions to introduction and discussion, references ad

Scientific paper

10.1088/1126-6708/2001/05/020

We calculate the potential between two static quarks in QCD using modified boundary conditions for the perturbative expansion. Through a change of the Feynman iepsilon prescription we effectively add a "sea" of gluons to the asymptotic states with energies below a given scale Lambda. We find that the standard result for the static potential gets corrections of order Lambda^2/Q^2 both at small and large momentum transfers Q^2. After resummation of the infrared sensitive corrections we find that the running coupling alpha_s(Q^2) freezes in the infrared and that the exchanged gluon gets an effective tachyonic mass. We verify that identical results are obtained in the Coulomb and Feynman gauges.

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