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

Authors:Azzolini, Virginia
López-March, Neus
Martínez-Vidal, Fernando
Milanés, Diego A.
Oyanguren, Arantza
Babar Collaboration
Aubert, B.
Issue Date:11-Sep-2009
Publisher:American Physical Society
Citation:Physical Review - Section D - Particles and Fields 80 (5): 052002 (2009)
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.
Publisher version (URL):http://dx.doi.org/ 10.1103/PhysRevD.80.052002
URI:http://hdl.handle.net/10261/21942
ISSN:1550-7998
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