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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544215.0, MPI für Physik / MPI für Physik
Reshuffling the OPE: Delocalized Operator Expansion
Authors:Hoang, A. H.; Hofmann, R.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:67
Start Page:054024
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:A prescription for the short-distance expansion of Euclidean current
correlators based on a delocalized modification of the multipole expansion of
perturbative short-distance coefficient functions is proposed that appreciates
the presence of nonlocal physics in the nonperturbative QCD vacuum. This
expansion converges better than the local Wilson OPE, which is recovered in the
limit of infinite resolution. As a consequence, the usual local condensates in
the Wilson OPE become condensates that depend on a resolution parameter and
that can be expressed as an infinite series of local condensates with
increasing dimension. In a calculation of the nonperturbative correction to the
ground state energy level of heavy quarkonia the improved convergence
properties of the delocalized expansion are demonstrated. Phenomenological
evidence is gathered that the gluon condensate, often being the leading
nonperturbative parameter of the Wilson OPE, is indeed a function of
resolution. The delocalized expansion is applied to derive a leading order
scaling relation for $f_D/f_B$ in the heavy mass expansion.
Classification / Thesaurus:Phenomenology of High Energy Physics
Comment of the Author/Creator:28 pages, 4 figures, replaced with version published in PRD
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2002-24
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/hep-ph/0206201
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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