CLEO and E791 data: A smoking gun for the pion distribution amplitude?

Abstract

The CLEO experimental data on the $\pi \gamma$ transition are analyzed to next-to-leading order accuracy in QCD perturbation theory using light-cone QCD sum rules. By processing these data along the lines proposed by Schmedding and Yakovlev, and recently revised by us, we obtain new constraints for the Gegenbauer coefficients $a_2$ and $a_4$, as well as for the inverse moment $x^{-1}$ of the pion distribution amplitude (DA). The former determine the pion DA at low momentum scale, the latter is crucial in calculating pion form factors. From the results of our analysis we conclude that the data confirm the end-point suppressed shape of the pion DA we previously obtained with QCD sum rules and nonlocal condensates, while the exclusion of both the asymptotic and the Chernyak--Zhitnitsky DAs is reinforced at the $3\sigma$- and $4\sigma$-level, respectively. The reliability of the main results of our updated CLEO data analysis is demonstrated. Our pion DA is checked against the di-jets data from the E791 experiment, providing credible evidence for our results far more broadly.

11 pages, 5 figures as EPS files. 2 figures added; discussion of NNLO effects added and discussion of twist-4 uncertainties expanded; some typos corrected; physics unchanged; some references added. Matches version to appear in PLB

References in corpus (5)

• Unbiased analysis of CLEO data at NLO and pion distribution amplitude
• Next-to-next-to-leading order prediction for the photon-to-pion transition form factor
• Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors
• Transverse lattice calculation of the pion light-cone wavefunctions
• Pion distribution amplitudes within the instanton model of QCD vacuum

Cited by in corpus (78)

• Unraveling hadron structure with generalized parton distributions
• New Results on B->pi, K, eta Decay Formfactors from Light-Cone Sum Rules
• The Physics of the B Factories
• Measurement of the gamma gamma* --> pi0 transition form factor
• B -> M1 M2: Factorization, Charming Penguins, Strong Phases, and Polarization
• Insights into the Emergence of Mass from Studies of Pion and Kaon Structure
• Two body B decays with isosinglet final states in SCET
• Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited
• Hadron tomography by generalized distribution amplitudes in pion-pair production process ${\gamma }^{\ast }\gamma \to {\pi }^0{\pi }^0$ and gravitational form factors for pion
• Evolved QCD predictions for the meson-photon transition form factors
• Measurement of the gamma gamma* --> eta and gamma gamma* --> eta' transition form factors
• Pion form factor in QCD: From nonlocal condensates to NLO analytic perturbation theory
• Generalized parton distributions of the pion in chiral quark models and their QCD evolution
• Basis light front quantization for the charged light mesons with color singlet Nambu--Jona-Lasinio interactions
• QCD Analytic Perturbation Theory. From integer powers to any power of the running coupling
• Comparing antithetic trends of data for the pion-photon transition form factor
• Transition form factors of the pion in light-cone QCD sum rules with next-to-next-to-leading order contributions
• An Implication on the Pion Distribution Amplitude from the Pion-Photon Transition Form Factor with the New BABAR Data
• Pion-photon transition---the new QCD frontier
• Transition form factors ${\gamma }^{\ast }\gamma \to \eta$ and ${\gamma }^{\ast }\gamma \to {\eta }^{\prime }$ in QCD
• Pion transition form factor in k_T factorization
• Tagging the pion quark structure in QCD
• Can we understand an auxetic pion-photon transition form factor within QCD? BaBar faces Belle
• The leading-twist pion and kaon distribution amplitudes from the QCD instanton vacuum
• Constraints on the Light Pseudoscalar Meson Distribution Amplitudes from Their Meson-Photon Transition Form Factors
• Pion transition form factor in the Regge approach and incomplete vector-meson dominance
• B- -> pi- pi0/rho- rho0 to NNLO in QCD factorization
• QCD sum rules with nonlocal condensates and the spacelike pion form factor
• Leading-twist pion and kaon distribution amplitudes in the gauge-invariant nonlocal chiral quark model from the instanton vacuum
• Pion transition form factor and distribution amplitudes in large-Nc Regge models
• Endpoint behavior of the pion distribution amplitude in QCD sum rules with nonlocal condensates
• Chimera distribution amplitudes for the pion and the longitudinally polarized $\rho$-meson
• On Differences Between SCET and QCDF for B->pi pi Decays
• Analyticity properties of three-point functions in QCD beyond leading order
• Pion-photon transition form factor in LCSR and tests of asymptotics
• Quasi-distribution amplitudes for pion and kaon via the nonlocal chiral-quark model
• What binds quarks together at different momentum scales? A conceptual scenario
• Chiral Anomaly Effects and the BaBar Measurements of the $\gamma {\gamma }^{\ast }\to {\pi }^0$ Transition Form Factor
• A Comprehensive Analysis on the Pion-Photon Transition Form Factor Beyond the Leading Fock State
• ${\pi }^0\to {\gamma }^{\ast }\gamma$ transition form factor within Light Front Quark Model
• Possible complex annihilation and B -> K pi direct CP asymmetry
• Deep inside the pion. Reconciling QCD theory with data
• Exclusive channels in semi-inclusive production of pions and kaons
• Rho meson distribution amplitudes from QCD sum rules with nonlocal condensates
• The gluon content of the $\eta$ and ${\eta }^{\prime }$ mesons and the $\eta \gamma$, ${\eta }^{\prime }\gamma$ electromagnetic transition form factors
• Pion form factor analysis using NLO analytic perturbation theory
• Polarized and unpolarized $\mu$-pair meson-induced Drell--Yan production and the pion distribution amplitude
• New vistas of the meson structure in QCD from low to high energies
• On the pion distribution amplitude. Derivation, properties, predictions
• QCD Sum Rules on the Light-Cone, Factorisation and SCET
• Exclusive processes $e^{+}{e}^{-}\to VP$ in $k_T$ factorization
• Matching lightcone- and anomaly-sum-rule predictions for the pion-photon transition form factor
• Operator Product Expansion and Quark-Hadron Duality: Facts and Riddles
• Infrared renormalons and single meson production in proton-proton collisions
• Single Meson Production in Photon-Photon Collisions and Infrared Renormalons
• Duality between different mechanisms of QCD factorization in γ^*γcollisions
• Strong decays ${\Sigma }^{\ast }\to \Sigma \pi ,\Lambda \pi$ and related strong coupling constant
• Renormalization-group improved evolution of the meson distribution amplitude at the two-loop level
• Pion-photon transition form factor using light-cone sum rules: theoretical results, expectations, and a global-data fit
• Transverse-Momentum Dependent Factorization for gamma^* pi^0 to gamma
• Study of pesudoscalar transition form factors within light front quark model
• Measurement of the Pion and Photon Light-Cone Wave Functions by Diffractive Dissociation
• Inclusive Gluon Production in Pion-Proton Collisions and the Principle Maximum Conformality Renormalization Scale
• Constraints on the Leading-Twist Pion Distribution Amplitude from A QCD Light-Cone Sum Rule with Chiral Current
• Resummation of Large Logarithms in ${\gamma }^{\ast }{\pi }^0\to \gamma$
• Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data
• Structure and decay constant of the ρmeson with Bethe-Salpeter equation
• New physics contributions to ${\bar{B}}_s\to {\pi }^0({\rho }^0){\eta }^{{(}^{\prime })}$ decays
• Theoretical description and measurement of the pion-photon transition form factor
• Pion-photon transition form factor. Living on the QCD frontier
• Improved estimates of the pion-photon transition form factor in the $(1\le {\mathbf{Q}}^2\le 5)$~GeV${}^2$ range and their theoretical uncertainties
• Pion Form Factor in the NLC QCD SR approach
• Electromagnetic form-factor of the $\pi$ meson with light-cone QCD sum rules
• Non-leptonic B-decays in and beyond QCD Factorisation
• The inclusive production of charged pion pairs in proton-antiproton collisions
• Direct ${\rho }_L$ meson production in proton-proton and proton-antiproton collisions
• Pion Form Factor in QCD: How to Calculate?
• Higher-twist mechanism and inclusive gluon production in pion-proton collisions