English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study the perturbative QCD contribution of the twist-2 operator to the light-cone QCD sum rule for the $\gamma\gamma^*\to\pi^0$ form factor. We derive QCD sum rules at next-to-leading order (NLO), which give predictions for the $F^{\pi \gamma\gamma^*}(Q^2)$ form factor. We perform a detailed numerical analysis. Using CLEO experimental data, we extract the shape of the pion wave function of twist-2. We estimate the Gegenbauer coefficients as $a_2=0.19 \pm 0.04 (stat.)\pm 0.09 (syst.)$ and $a_4=-0.14\pm 0.03 (stat.)\mp 0.09 (syst.)$ at $\mu=2.4$ GeV. We compare our results with those existing in the literature

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Perturbative effects in the form factor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>and extraction of the pion distribution amplitude from CLEO data

Perturbative effects in the form factorγγ*→π0and extraction of the pion distribution amplitude from CLEO data