# Scalar Meson Decay Constants and the Nature of the a\_0(980)

Source: [Scalar Meson Decay Constants and the Nature of the a\_0(980)](<https://www.sota2.com/research/paper/68fa25102c2a3760193ac36e>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T10:07:09.070Z

Authors: K. Maltman

Published: 2000-05-16T20:25:23.000Z

## Abstract

The a\_0(980), a\_0(1450) and K\_0(1430) decay constants are determined using a form of QCD sum rules known to produce a very accurate determination of the rho decay constant. The ratio of a\_0(980) to K\_0(1430) decay constants is shown to be ~0.6, ruling out both the \`\`loosely-bound-K\\bar{K}-molecule'' and Gribov minion scenarios for the a\_0(980). Solutions for the isovector scalar spectral function obtained in the literature from sum rule analyses employing a more restrictive single-resonance-plus-continuum form of the input spectral ansatz, are also investigated. These solutions, which suggest, in contrast to the present results, negligible coupling of the a\_0(980) to the isovector scalar density are shown to produce a poor quality match between the OPE and hadronic sides of the sum rules employed here, and hence to be strongly disfavored relative to the present solution.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/0005155>)

[PDF](<https://arxiv.org/pdf/hep-ph/0005155.pdf>)