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Measurement of the γγ*→π0 transition form factor

Abstract:
We study the reaction e+e-→e+e-π0 in the single tag mode and measure the differential cross section dσ/dQ2 and the γγ *→π0 transition form factor in the momentum transfer range from 4 to 40GeV2. At Q2>10GeV2 the measured form factor exceeds the asymptotic limit predicted by perturbative QCD. The analysis is based on 442fb-1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV. © 2009 The American Physical Society.

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Publisher copy:
10.1103/PhysRevD.80.052002

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Journal:
Physical Review D
Volume:
80
Issue:
5
Publication date:
2009-09-11
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
Source identifiers:
211398
Language:
English
Pubs id:
pubs:211398
UUID:
uuid:aa078737-784b-48c8-adea-41e9b852ad78
Local pid:
pubs:211398
Deposit date:
2012-12-19

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