Heavy quark induced effective action for gauge fields in the SU(N_c)\otimes U(1) model and the low-energy structure of heavy quark current correlators |
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Authors: | S Groote AA Pivovarov |
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Institution: | Institut für Physik der Johannes-Gutenberg-Universit?t, Staudinger Weg 7, 55099 Mainz, Germany, DE
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Abstract: | We calculate the low-energy limit of heavy quark current correlators within an expansion in the inverse heavy quark mass.
The induced low-energy currents built from the gluon fields corresponding to the initial heavy quark currents are obtained
from an effective action for gauge fields in the one-loop approximation at the leading order of the expansion. Explicit formulae for the low-energy spectra of electromagnetic and tensor heavy quark current correlators are
given. Consequences of the appearance of a nonvanishing spectral density below the two-particle threshold for high precision
phenomenology of heavy quarks are discussed quantitatively.
Received: 21 April 2001 / Revised version: 18 May 2001 / Published online: 29 June 2001 |
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