Year: 2001
Type: preprint
Abstract: Results are reviewed, which provide relations between the response (and eventual instability) of the chiral QCD vacuum to an increase of the number of massless quarks in the theory and the observed violations of the large $N_c$ expansion in the scalar meson sector, by combining chiral perturbation theory expansions in $m_s$ with sum rule methods. An approach based on the construction of scalar form-factors was recently confirmed by an independent approach which uses the $πK$ scattering amplitudes.
Source: arXiv (Cornell University)
Author: Moussallam, B.
Institution: Institut de Physique Nucléaire d’Orsay
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1623825762