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- W1965828082 abstract "We outline a new approach to transverse momentum dependence in hard processes using as an example the exclusive transition $${gamma^{*}gamma to pi^{0}}$$ at the handbag level. We start with the coordinate representation for a matrix element $${langle p |{cal O}(0,z) |0 rangle}$$ of a bilocal operator $${{cal O} (0,z)}$$ describing a hadron with momentum p. Treated as a function of (pz) and z 2, it is parametrized through virtuality distribution amplitude (VDA) Φ (x, σ), with x being Fourier-conjugate to (pz) and σ Laplace-conjugate to z 2. For intervals with z + = 0, we introduce the transverse momentum distribution amplitude (TMDA) $${Psi (x,k_{perp})}$$ , and write it in terms of VDA Φ (x, σ). The results of covariant calculations, written in terms of Φ (x, σ) are converted into expressions involving $${Psi (x,k_{perp})}$$ . We propose simple models for soft VDAs/TMDAs, and use them for comparison of handbag results with experimental (BaBar and BELLE) data on the pion transition form factor." @default.
- W1965828082 created "2016-06-24" @default.
- W1965828082 creator A5077070678 @default.
- W1965828082 date "2014-11-05" @default.
- W1965828082 modified "2023-10-11" @default.
- W1965828082 title "Virtuality Distributions and $${gammagamma^{*} to pi^{0}}$$ γ γ ∗ → π 0 Transition Form Factor at Handbag Level" @default.
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- W1965828082 doi "https://doi.org/10.1007/s00601-014-0916-1" @default.
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