Instanton effects on the twist-three light-cone distribution amplitudes of pion and light scalar mesons above 1 GeV

Journal Article · Sun May 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.094025· OSTI ID:21541612

Jin, Zhang; Hongying, Jin ^[1]; Zhufeng, Zhang ^[2]

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1. Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang (China)
2. Department of Physics, Ningbo University, Ningbo, Zhejiang (China)

By use of a single-instanton approximation the twist-three light-cone distribution amplitudes of the pion as well as the p-wave mesons, i.e., f{sub 0}(1370), K{sub 0}*(1430), and a{sub 0}(1450), are investigated within the framework of QCD moment sum rules with the inclusion of instanton effects based on the valence quark model. The results show that there is much change on light-cone distribution amplitudes due to the isospin- and chirality-dependent instanton contribution compared with the instanton-free ones. We find that the instanton-involved twist-three light-cone distribution amplitudes are non-positive-definite within some range of the momentum fraction and that there are rapid changes at two ends of the momentum fraction. To guarantee the convergence of moments using the method in this work, a low instanton density should be adopted; for instance, n{sub c}=(1/2) fm{sup -4}. Possible ingredients which might have an impact on the results are briefly discussed. These light-cone distribution amplitudes may be helpful to analyze exclusive heavy-flavored processes.

• OSTI ID: 21541612
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 9; Other Information: DOI: 10.1103/PhysRevD.83.094025; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
APPROXIMATIONS
CHIRALITY
CONVERGENCE
DENSITY
DISTRIBUTION
GEV RANGE 01-10
INCLUSIONS
ISOSPIN
LIGHT CONE
P WAVES
PIONS
QUANTUM CHROMODYNAMICS
QUARK MODEL
SCALAR MESONS
SUM RULES
BOSONS
CALCULATION METHODS
COMPOSITE MODELS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
FIELD THEORIES
GEV RANGE
HADRONS
MATHEMATICAL MODELS
MESONS
PARTIAL WAVES
PARTICLE MODELS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
SPACE-TIME