The 7/11 rule: an estimate of m_rho/f_pi

Details The 7/11 rule: an estimate of m_rho/f_pi The 7/11 rule: an estimate of m_rho/f_pi

1999-08-04

arxiv.org/abs/hep-ph/9908252v2

Phys.Rev.D61:034018,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 1 figure. Numerical error in scalar sector corrected; main results unchanged

Scientific paper

10.1103/PhysRevD.61.034018

We derive an estimate for the ratio of the rho mass and the pion decay constant from an analysis of vector and axial-vector two-point functions using large-Nc, lowest-meson dominance and the operator product expansion, in the chiral limit. We discuss the extension of this analysis to the scalar and pseudoscalar sector. Furthermore, this leads to a successful parameter-free determination of the L_i couplings of the chiral Lagrangian if an improved Nambu-Jona-Lasinio ansatz for Green functions is assumed at low energies.

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