Transition formfactors γ* → γf2 (1270) and γ* → γa2 (1320) in the e+e− collisions
1 Sobolev Institute for Mathematics, 630090 Novosibirsk, Russia
2 Novosibirsk State University, 630090 Novosibirsk, Russia
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Published online: 28 October 2016
Transition form factors γ* → γf2 (1270) and γ* → γa2 (1320) and corresponding e+e− → γ* → f2γ and e+e− → γ* → a2γ cross sections are considered up to high energies. It is shown that the QCD asymptotics of the amplitudes of the e+e− → γ* → f2γ and e+e− → γ* → a2γ reactions can be reached only by taking into account a compensation of contributions of ρ(770), ω(782) with contributions of their radial excitations. Recent BABAR measurement of the e+e− → f2γ → π+π−γ cross section at 10.58 GeV gives hope for detailed investigation of the γ*(s) → f2γ and γ*(s) → a2γ transition form factors at high energy region. Recent Belle data on the γ*(Q2)γ → f2 transition up to Q2 = 30 GeV2 are taken into account.
© The Authors, published by EDP Sciences, 2016
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