Austrian Academy of Sciences

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20022015

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Showing 2012 · hep-phShow all

4 papers · 2 filters

hep-ph2012★ 22 cited

Universal behaviour of the $γ^{*} γ \to (π^{0}, η, η^{'})$ transition form factors

Dmitri Melikhov, Berthold Stech

The photon transition form factors of $π$ , $η$ and $η^{'}$ are discussed in view of recent measurements. It is shown that the exact axial anomaly sum rule allows a precise comparison…

hep-ph2012★ 14 cited

The $γ^{} γ^{} \to η_{c}$ transition form factor

Wolfgang Lucha, Dmitri Melikhov

We study the $γ^{*} γ^{*} \to η_{c}$ transition form factor, $F_{η_{c} γ γ} (Q_{1}^{2}, Q_{2}^{2}),$ with the local-duality (LD) version of QCD sum rules. We analyse the extraction of this quantity from…

hep-ph2012★ 19 cited

On the $γ^{*} γ \to π (η, η^{'})$ transition form factors

Dmitri Melikhov, Berthold Stech

The surprising results by the BarBar collaboration on the $π γ$ transition form factor require new thoughts about the high- $Q^{2}$ dependence of the form factors with virtual photons.…

hep-ph2012

Elastic and transition form factors of light pseudoscalar mesons from QCD sum rules

Irina Balakireva, Wolfgang Lucha, Dmitri Melikhov

We revisit $F_{π} (Q^{2})$ and $F_{P γ} (Q^{2})$ , $P = π, η, η^{'}$ , making use of the local-duality (LD) version of QCD sum rules. We give arguments, that the LD sum rule provides reliable predic…

Universal behaviour of the γ∗γ→(π0,η,η′) transition form factors

The γ∗γ∗→ηc​ transition form factor

On the γ∗γ→π(η,η′) transition form factors

Elastic and transition form factors of light pseudoscalar mesons from QCD sum rules

Universal behaviour of the $γ^{*} γ \to (π^{0}, η, η^{'})$ transition form factors

The $γ^{} γ^{} \to η_{c}$ transition form factor

On the $γ^{*} γ \to π (η, η^{'})$ transition form factors