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- W1659395518 abstract "We discuss the status of the pion distribution amplitude (DA) from analyzing the CLEO experimental data in the context of QCD sum-rule techniques and QCD perturbation theory at the NLO accuracy. The constraints extracted this way for the Gegenbauer coefficients a_2 and a_4 exclude Phi_{CZ} at the 4sigma level, while Phi_{asy} is outside the 3sigma error ellipse. These data provide strong support for the type of endpoint-suppressed, double-humped pion DA we derived via QCD sum rules with nonlocal condensates and favor a value of the vacuum quark virtuality lambda_q^2 simeq 0.4 GeV^2. This pion DA is in agreement with the E791 data, though these experimental results should be viewed carefully and further confirmation is necessary for a more accurate judging of pion DAs from them." @default.
- W1659395518 created "2016-06-24" @default.
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- W1659395518 date "2003-10-22" @default.
- W1659395518 modified "2023-09-27" @default.
- W1659395518 title "What is this thing called pion distribution amplitude? From theory to data" @default.
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