Summary
Some QCD-inspired spectral function sum rules are discussed, in view of the most recent experimental results on scalar and pseudoscalar mesons. Estimates are performed of the weak-decay amplitudes of 0− radial excitations, of the current quark mass ratiom g/md and of the quark vacuum condensate ratio\(\langle \bar \psi _s \psi _s \rangle /\langle \bar \psi _u \psi _u \rangle \).
Riassunto
Si discutono alcune regole di somma per funzioni a due punti ottenute nel contesto della QCD, prendendo in considerazione i piú recenti risultati sperimentali sui mesoni scalari e pseudoscalari. Si danno delle stime delle costanti di decadimento debole delle eccitazioni radiali 0−, del rapporto delle masse dei quarkm 8/md e del rapporto dei condensati dei quark\(\langle \bar \psi _s \psi _s \rangle /\langle \bar \psi _u \psi _u \rangle \).
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Address after September 1st: Theory Division, CERN-CH 1211 Genève 23, Switzerland.
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Narison, S., Paver, N. & Treleani, D. Properties of the meson system and chiral-symmetry-breaking parameters from quantum chromodynamics. Nuov Cim A 74, 347–363 (1983). https://doi.org/10.1007/BF02770885
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DOI: https://doi.org/10.1007/BF02770885