Document Type

Conference Paper

Publication Date

2015

DOI

10.1142/S2010194515600502

Publication Title

International Journal of Modern Physics: Conference Series

Volume

37

Pages

1560050

Conference Name

QCD Evolution Workshop; 12-16 May 2014, Santa Fe, New Mexico

Abstract

Using the example of hard exclusive transition process ᵞ*ᵞ → π⁰ at the handbag level, we outline basics of a new approach to transverse momentum dependence in hard processes. In coordinate representation, matrix elements of operators (in the simplest case, bilocal 𝒪(0, z)) describing a hadron with momentum p, are functions of (pz) and z² parametrized through virtuality distribution amplitudes (VDA) Φ(x, σ), with x being Fourier-conjugate to (pz) and σ Laplace-conjugate to z2. For intervals with z+ = 0, we introduce the transverse momentum distribution amplitude (TMDA) Ψ(x, k⊥), and write it in terms of VDA Φ(x, σ). We propose models for soft VDAs/TMDAs, and use them for comparison of handbag results with experimental (BaBar and BELLE) data. We also discuss the generation of hard tails of TMDAs from initially soft forms.

Rights

© 2015 The Author.

It is distributed under the terms of the Creative Commons Attribution 3.0 Unported(CC-BY 3.0) License. Further distribution of this work is permitted, provided the original work is properly cited.

Comments

PACS: 11.10.-z,

13.38.-t

13.60.Fz

Original Publication Citation

Radyushkin, A. V. (2015). Virtuality distributions and pion transition form factor. International Journal of Modern Physics: Conference Series. 37, 1560050. https://doi.org/10.1142/S2010194515600502

ORCID

0000-0002-9326-1300 (Radyushkin)

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