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Prog. Theor. Phys. Vol. 109 No. 3 (2003) pp. 371-381

[ Full Text PDF : OPEN SELECT (149K) ]

Proper Construction of the Continuum in Light-Cone QCD Sum Rules

Hungchong Kim,1,2 Su Houng Lee1 and Makoto Oka2

1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
2Department of Physics, Tokyo Institute of Technology, Tokyo 152-8552, Japan

(Received December 6, 2002)

Abstract:

A proper method of subtracting the continuum contributions in light-cone QCD sum rules (LCQSR) is demonstrated. Specifically, we calculate the continuum corresponding to a typical operator product expansion (OPE) appearing in LCQSR by properly combining the double dispersion relation with QCD duality. We demonstrate how the subtraction terms can spuriously contribute to the sum rules. In the limit of zero external momentum, removal of the spurious continuum is found to yield the sum rules using the single-variable dispersion relation. The continuum factor constructed in this way differs from that appearing in usual LCQSR. The difference substantially affects the extraction of hadronic parameters from the correlation function involving baryon currents.


URL : http://ptp.ipap.jp/link?PTP/109/371/
DOI : 10.1143/PTP.109.371

[ Full Text PDF : OPEN SELECT (149K) ] Citation:

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