γ* → γf{sub 2}(1270) and γ* → γa{sub 2}(1320) Transition Form Factors in e{sup +}e{sup −} Collisions
- Russian Academy of Sciences, Laboratory of Theoretical Physics, Sobolev Institute of Mathematics, Siberian Branch (Russian Federation)
The γ* → γf{sub 2}(1270) and γ* → γa{sub 2}(1320) transition form factors are considered up to high energies, along with the cross sections for the respective processes e{sup +}e{sup −} → γ* → f{sub 2}γ and e{sup +}e{sup −} → γ* → a{sub 2}γ. It is shown that QCD asymptotic behavior of the amplitudes for the reactions e{sup +}e{sup −} → γ* → f{sub 2}γ and e{sup +}e{sup −} → γ* → a{sub 2}γ can be reached after the compensation of the contributions of the ρ(770) and ω(782) mesons with the contributions of their radial excitations. The ratio σ(e{sup +}e{sup −} → γ* → f{sub 2}γ)/σ(e{sup +}e{sup −} → γ* → a{sub 2}γ) ≈ 25/9, obtained on the basis of the two-quark model of a{sub 2} and f{sub 2} and within QCD, is used to determine σ(e{sup +}e{sup −} → γ* → a{sub 2}γ) at high energies. Recent data from the Belle detector on the γ*(Q{sup 2})γ → f{sub 2} transition over the region extending up to Q{sup 2} = 30 GeV{sup 2} are taken into account. A substantial improvement of experimental accuracies is required for a detailed comparison of our predictions with experimental data at high energies. A recent measurement of the e{sup +}e{sup −} → f{sub 2}γ → π{sup +}π{sup −}γ cross section at 10.58 GeV with the BaBar detector gives grounds to hope for this.
- OSTI ID:
- 22761763
- Journal Information:
- Physics of Atomic Nuclei, Vol. 81, Issue 1; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7788
- Country of Publication:
- United States
- Language:
- English
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