Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-18
JHEP 0103:002,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
58 pages, 18 figures
Scientific paper
10.1088/1126-6708/2001/03/002
We discuss the role of the Zweig rule violation in the scalar channel for 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 Zweig Rule 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 scalar channel is used to constrain L_6, indicating a significant decrease between the two- and the three-flavor condensates. The analysis of the scalar form factors of the pion at zero momentum suggests that the pseudoscalar decay constant could also be suppressed from N_f=2 to 3.
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