Twist-3 pion and kaon distribution amplitudes from the instanton vacuum with flavor SU(3) symmetry breaking
- Department of Physics and Nuclear Physics and Radiation Technology Institute (NuRI), Pusan National University, Busan 609-735 (Korea, Republic of)
We investigate the twist-3 pion and kaon distribution amplitudes of the pseudoscalar ({phi}{sub {pi}}{sub ,K}{sup p}) and pseudotensor ({phi}{sub {pi}}{sub ,K}{sup {sigma}}) types, based on the effective chiral action from the instanton vacuum. Flavor SU(3) symmetry breaking effects are explicitly taken into account. The Gegenbauer moments and the moments of the distribution amplitudes (<{xi}{sup m}>) are also computed. Our results are summarized as follows: a{sub 2,{pi}}{sup p}{approx}0.4, a{sub 1,K}{sup p}{approx}0.02 and a{sub 2,K}{sup p}{approx}0.14, and a{sub 2,{pi}}{sup {sigma}}{approx}0.02 and a{sub 1,K}{sup {sigma}}{approx}a{sub 2,K}{sup {sigma}}{approx}0; <{xi}{sup 2}>{sub {pi}}{sup p}{approx}<{xi}{sup 2}>{sub K}{sup p}{approx}0.37 and <{xi}>{sub K}{sup p}{approx}0, and <{xi}{sup 2}>{sub {pi}}{sup {sigma}}{approx}<{xi}{sup 2}>{sub K}{sup {sigma}}{approx}0.20 and <{xi}>{sub K}{sup {sigma}}{approx}0. We compare our results with those from the QCD sum rules. We also discuss the relevant Wilson coefficients which were analyzed recently in chiral perturbation theory.
- OSTI ID:
- 20873175
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 74, Issue 9; Other Information: DOI: 10.1103/PhysRevD.74.096007; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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