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Measurement of the gamma gamma* -> pi(0) transition form factor

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Aubert, B., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M. et al.
(2009) Measurement of the gamma gamma* -> pi(0) transition form factor. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.80 (No.5). article no. 052002. doi:10.1103/PhysRevD.80.052002

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Abstract

We study the reaction e(+)e(-) -> e(+)e(-)pi(0) in the single tag mode and measure the differential cross section d sigma/dQ(2) and the gamma gamma* -> pi(0) transition form factor in the momentum transfer range from 4 to 40 GeV2. At Q(2) > 10 GeV2 the measured form factor exceeds the asymptotic limit predicted by perturbative QCD. The analysis is based on 442 fb(-1) of integrated luminosity collected at PEP-II with the BABAR detector at e(+)e(-) center-of-mass energies near 10.6 GeV.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: September 2009
Dates:
DateEvent
September 2009Published
Volume: Vol.80
Number: No.5
Number of Pages: 16
Page Range: article no. 052002
DOI: 10.1103/PhysRevD.80.052002
Status: Peer Reviewed
Publication Status: Published
Funder: U.S. Department of Energy and National Science Foundation, Natural Sciences and Engineering Research Council (Canada), Commissariat a l'Energie Atomique and Institut National de Physique Nucleaire et de Physique des Particules (France), Bundesministerium fur Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), Istituto Nazionale di Fisica Nucleare (Italy), Foundation for Fundamental Research on Matter (The Netherlands), Research Council of Norway, Ministry of Science and Technology of the Russian Federation, Ministerio de Educacion y Ciencia (Spain), Science and Technology Facilities Council (United Kingdom), Marie-Curie IEF program (European Union), A. P. Sloan Foundation

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