QCD sum rule analysis of the mixed-isospin vector current correlator reexamined

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.2563· OSTI ID:279175

Maltman, K ^[1]

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1. Department of Mathematics and Statistics, York University, 4700 Keele Street, North York, Ontario, M3J 1P3 (CANADA)

The mixed-isospin vector current correlator {l_angle}0{parallel}{ital T}({ital V}{sub {mu}}{sup {rho}}{ital V}{sub {nu}}{sup {omega}}){parallel}0{r_angle} is evaluated using QCD sum rules. The sum rule treatment is a modification of previous analyses necessitated by the observation that those analyses produce forms of the correlator that fail to be dominated, near {ital q}{sup 2}=0, by the most nearby singularities. The inclusion of contributions associated with the {phi} meson rectifies this problem. The resulting sum rule fit provides evidence for a significant direct {omega}{r_arrow}{pi}{pi} coupling contribution in {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}. It is also pointed out that results for the {ital q}{sup 2} dependence of the correlator cannot be used to provide information about the (off-shell) {ital q}{sup 2} dependence of the off-diagonal element of the vector meson propagator unless a very specific choice of interpolating fields for the vector mesons is made. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279175
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 53; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ISOSPIN
MOMENTUM TRANSFER
PROPAGATOR
QUANTUM CHROMODYNAMICS
SINGULARITY
SUM RULES
VECTOR CURRENTS
VECTOR MESONS