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Titolo:
Zweig rule violation in the scalar sector and values of low-energy constants
Autore:
Descotes, S;
Indirizzi:
Univ Paris Sud, IPN Grp Phys Theor, F-91406 Orsay, France Univ Paris Sud Orsay France F-91406 rp Phys Theor, F-91406 Orsay, France Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, EnglandUniv Southampton Southampton Hants England SO17 1BJ 7 1BJ, Hants, England
Titolo Testata:
JOURNAL OF HIGH ENERGY PHYSICS
fascicolo: 3, volume: 2001, anno: 2001,
pagine: NIL_95 - NIL_147
SICI:
1029-8479(200103)2001:3<NIL_95:ZRVITS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PI-PI SCATTERING; CHIRAL PERTURBATION-THEORY; FORM-FACTORS; SYMMETRY-BREAKING; MESON DYNAMICS; 2 LOOPS; QCD; EXPANSION; FLAVORS; QUARK;
Keywords:
spontaneous symmetry breaking; QCD; chiral lagrangians;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Descotes, S Univ Paris Sud, IPN Grp Phys Theor, F-91406 Orsay, France UnivParis Sud Orsay France F-91406 r, F-91406 Orsay, France
Citazione:
S. Descotes, "Zweig rule violation in the scalar sector and values of low-energy constants", J HIGH EN P, 2001(3), 2001, pp. NIL_95-NIL_147

Abstract

We discuss the role of the Zweig rule (ZR) violation in the scalar channelfor the determination of low-energy constants and condensates arising in the effective chiral lagrangian of QCD. The analysis of the Goldstone boson masses and decay constants shows that the three-flavor condensate and some low-energy constants are very sensitive to the value of the ZR violating constant L-6. A similar study is performed in the case of the decay constants. A chiral sum rule based on experimental data in the 0(++) channel is usedto constrain L-6, indicating a significant decrease between the two- and the three-flavor condensates. The analysis of the scalar form factors of thepion at zero momentum suggests that the pseudoscalar decay constant could also be suppressed from N-f = 2 to 3.

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Documento generato il 28/03/20 alle ore 10:52:51