What is this thing called pion distribution amplitude? From theory to data

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dc.creatorBakulev, Alexander P.
dc.creatorMikhailov, S. V.
dc.creatorStefanis, N. G.
dc.date2003-10-22
dc.date.accessioned2026-07-07T03:50:57Z
dc.date.available2026-07-07T03:50:57Z
dc.descriptionWe 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 Φ_{CZ} at the 4σlevel, while Φ_{asy} is outside the 3σerror 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 λ_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.
dc.description6 pages, 4 figures, cernrep class. Talk presented at the LC03 Workshop "Hadrons and beyond"
dc.identifierhttps://arxiv.org/abs/hep-ph/0310267
dc.identifierhttp://arxiv.org/abs/hep-ph/0310267
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/42966
dc.subjectHigh Energy Physics - Phenomenology
dc.titleWhat is this thing called pion distribution amplitude? From theory to data
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