Proper construction of the continuum in light-cone QCD sum rules

Hungchong Kim, Su Houng Lee, Makoto Oka

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10 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)371-381
Number of pages11
JournalProgress of Theoretical Physics
Volume109
Issue number3
DOIs
Publication statusPublished - 2003 Mar

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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