Low-energy gluon contributions to the vacuum polarization of heavy quarks

Details Low-energy gluon contributions to the vacuum polarization of heavy quarks Low-energy gluon contributions to the vacuum polarization of heavy quarks

2001-03-05

arxiv.org/abs/hep-ph/0103047v1

JETP Lett. 75 (2002) 221; Pisma Zh.Eksp.Teor.Fiz. 75 (2002) 267

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages in LaTeX, 1 PostScript figure included in the text

Scientific paper

10.1134/1.1478517

We calculate a correction to the electromagnetic current induced by a heavy quark loop. The contribution of this correction to the vacuum polarization function appears at the O(alpha_s^3) order of perturbation theory and has a qualitatively new feature -- its absorptive part starts at zero energy in contrast to other contributions where the absorptive parts start at the two-particle threshold. Our result imposes a constraint on the order n of the moments used in the heavy-quark sum rules, n<4.

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