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

Preprint

5 March 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0103047

Abstract

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.

Keywords

ABSORPTIVE PART STARTS
PERTURBATION THEORY
VACUUM POLARIZATION
CURRENT INDUCED
ENERGY GLUON
HEAVY QUARK
GLUON
QUARK

All Related Versions

Version 1, 2001-03-05, ArXiv
Published version: JETP Letters, 75 (5), 221.

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