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Type: Journal article
Title: Kaon and pion parton distribution amplitudes to twist three
Author: Shi, C.
Chen, C.
Chang, L.
Roberts, C.
Schmidt, S.
Zong, H.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2015; 92(1):014035-1-014035-15
Publisher: American Physical Society.
Issue Date: 2015
ISSN: 1550-7998
Statement of
Chao Shi, Chen Chen, Lei Chang, Craig D. Roberts, Sebastian M. Schmidt, and Hong-Shi Zong
Abstract: We compute all kaon and pion parton distribution amplitudes (PDAs) to twist three and find that only the pseudotensor PDA can reasonably be approximated by its conformal limit expression. At terrestrially accessible energy scales, the twist-two and pseudoscalar twist-three PDAs differ significantly from those functions commonly associated with their forms in QCD’s conformal limit. In all amplitudes studied, SU(3) flavor-symmetry breaking is typically a 13% effect. This scale is determined by nonperturbative dynamics; namely, the current-quark-mass dependence of dynamical chiral symmetry breaking. The heavier quark is favored by this distortion; for example, support is shifted to the s-quark in the negative kaon. It appears, therefore, that at energy scales accessible with existing and foreseeable facilities, one may obtain reliable expectations for experimental outcomes by using these “strongly dressed” PDAs in formulas for hard exclusive processes. Following this procedure, any discrepancies between experiment and theory will be significantly smaller than those produced by using the conformal-limit PDAs. Moreover, the magnitude of any disagreement will either be a better estimate of higher-order, higher-twist effects or provide more realistic constraints on the Standard Model.
Rights: © 2015 American Physical Society
DOI: 10.1103/PhysRevD.92.014035
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