Erratum to: “QCD-based pion distribution amplitudes confronting experimental data” [Phys. Lett. B 508 (2001) 279]

Bakulev, A. P.; Михайлов, С. В.; Stefanis, N. G.

doi:10.1016/j.physletb.2004.05.001

Cited by 139 publications

(477 citation statements)

References 3 publications

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“…Moreover, one observes that both predictions overlap with the band of the results derived in [2] and indicate conformity with endpoint-vanishing (or even endpoint-suppressed) pion DAs, like in the BMS formalism [18,34].…”

supporting

confidence: 69%

“…(ii) The error ellipses of the data (CELLO, CLEO, BaBar) in the (a 2 , a 4 ) plane overlap with the allowed region for these two parameters determined before [18] using QCD sum rules with nonlocal condensates [19]. These pion DAs are characterized by a strong suppression of their kinematical endpoints x = 0, 1, where x is the longitudinal momentum fraction of the quark inside the pion.…”

Section: Two-photon Processes For π 0 and η(η ′ ) In Qcdmentioning

confidence: 99%

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Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Stefanis

Bakulev²,

Михайлов³

et al. 2012

Nuclear Physics B - Proceedings Supplements

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We present an extended analysis of the data for the pion-photon transition form factor from different experiments, CELLO, CLEO, and BaBar, and discuss various theoretical approaches which try to reason from them. We focus on the divergent behavior of the BaBar data for the pion and those for the η(η ′ ) pseudoscalar mesons and comment on recently proposed explanations for this discrepancy. We argue that it is not possible at present to accommodate these data within the standard QCD framework self-consistently. Keywords:Meson transition form factors, pion distribution amplitude, QCD (light-cone) sum rules 1. Two-photon processes for π 0 and η(η ′ ) in QCD At the basis of applications of Quantum Chromodynamics (QCD), which governs the interactions of quarks and gluons, is the property of factorization of corresponding amplitudes in hard processes. Proving the property of factorization means that a hadronic process at large momentum transfer can be dissected in a product of distinct quantities each associated with separate regimes of dynamics. Then, subprocesses developing at short distances and involving partons-quarks and gluons-can be accurately described in a systematic way within perturbation theory. On the other hand, the dynamical (mainly nonperturbative) features of the hadron binding effects are encoded in correlators, which contain quark and gluon field operators, and can be parameterized in terms of light-cone wave functions and parton distribution functions. These quantities are process-independent and describe the universal interpolation between hadrons and their quark and gluon degrees of freedom as distributions over the fractions of * Corresponding author * * Speaker of the talk at the "Psi-to-Phi" Conference Email address: stefanis@tp2.ruhr-uni-bochum.de (N. G. Stefanis) the longitudinal and intrinsic transverse momenta carried by the partons. They have to be determined by nonperturbative methods (models), lattice calculations, or from the data.The (spacelike) transition form factors (TFFs) of pseudoscalar mesons, in particular the pion, have been extensively studied within QCD, because in leading order they are purely electromagnetic processes with the binding QCD effects being factorized out into the pion distribution amplitude (DA)-see [1] for a review and [2] for recent references. This means that for a highly virtual photon with the four-momentum transfer Q 2 and a quasi-real photon with q 2 → 0, the TFF can be cast as the convolution of the twist-two hard-scattering amplitude T (Q 2

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supporting

confidence: 69%

Section: Two-photon Processes For π 0 and η(η ′ ) In Qcdmentioning

confidence: 99%

Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Stefanis

Bakulev²,

Михайлов³

et al. 2012

Nuclear Physics B - Proceedings Supplements

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“…The data for the |n form factor are well described by the model with DA from Ref. [32], while the data for the π 0 form factor is reproduced by the models with a significantly wider DA [21,22] or a flat DA [23][24][25].…”

Section: Discussion and Summarymentioning

confidence: 73%

“…In Fig. 17 the form factor for the |n -state multiplied by 3Q 2 /5 is compared with the measured γ * γ → π 0 form factor [1] and the results of the QCD calculations performed by A. P. Bakulev, S. V. Mikhailov and N. G. Stefanis [29] for the asymptotic DA [30], the ChernyakZhitnitsky π 0 DA [31], and the π 0 DA derived from QCD sum rules with non-local condensates [32]. The horizontal dashed line indicates the asymptotic limit for the π 0 form factor.…”

Section: Discussion and Summarymentioning

confidence: 99%

Measurement of theγγ→ηandγγ→η′transition form factors

Sanchez¹,

Lees²,

Poireau³

et al. 2011

Phys. Rev. D

103

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“…To describe the data with the Q 2 dependence, the form factor is fitted to satisfy the formula Q 2 |F πγ (Q 2 )| = A Q 2 10 GeV 2 β (1) with A = 0.182 ± 0.002 GeV and β = 0.25 ± 0.02. Before the new data, most theoretical models predicted that the form factor approaches the QCD asymptotic limit [2], depending on the pion distribution amplitude (DA) with the Q 2 dependence under 10 GeV 2 [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

π0→γ*γtransition form factor within the light-front quark model

Lih¹,

Geng²

2012

Phys. Rev. C

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Erratum to: “QCD-based pion distribution amplitudes confronting experimental data” [Phys. Lett. B 508 (2001) 279]

Cited by 139 publications

References 3 publications

Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Measurement of theγγ→ηandγγ→η′transition form factors

π0→γ*γtransition form factor within the light-front quark model

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Erratum to: “QCD-based pion distribution amplitudes confronting experimental data” [Phys. Lett. B 508 (2001) 279]

Cited by 139 publications

References 3 publications

Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data

Measurement of theγγ*→ηandγγ*→η′transition form factors

π0→γ*γtransition form factor within the light-front quark model

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Product

Resources

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Measurement of theγγ→ηandγγ→η′transition form factors