Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:msup><mml:mi>γ</mml:mi><mml:mo>*</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>transition form factor

2009/09/11 by B. Aubert, Y. Karyotakis, J. P. Lees +97 · 1 voice · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.1103/physrevd.80.052002

openalex publication_date 2009/09/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

We study the reaction e⁺e^\ensuremath-\ensuremath→e⁺e^\ensuremath-\ensuremathπ⁰ in the single tag mode and measure the differential cross section d\ensuremathσ/dQ² and the \ensuremathγ\ensuremathγ^*\ensuremath→\ensuremathπ⁰ transition form factor in the momentum transfer range from 4 to 40 GeV². At Q²&gt;10 GeV² the measured form factor exceeds the asymptotic limit predicted by perturbative QCD. The analysis is based on 442 fb^\ensuremath-1 of integrated luminosity collected at PEP-II with the BABAR detector at e⁺e^\ensuremath- center-of-mass energies near 10.6 GeV.

Citations

• The precision Monte Carlo event generator for two-fermion final states in collisions

Cited by

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• Updated determination of the pion-photon transition form factor
• On the physical Relevance of the Study of gamma* gamma -&gt; pi0 pi0 at small t and large Q2

Discussions

• The initial valence quark assignment for the neutral pion came from the quark model, but the best direct experimental constraint on the quark content of the $\pi^0$ probably comes from its measured tw [stackexchange, 1 points]

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