Twist-three analysis of photon electroproduction off the pion

Andrei Belitsky, D. Müller, A. Kirchner, A. Schäfer

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

We study twist-three effects in spin, charge, and azimuthal asymmetries in deeply virtual Compton scattering on a spin-zero target. Contributions which are power suppressed in 1/Q. generate a new azimuthal angle dependence of the cross section that is not present in the leading twist results. On the other hand, the leading twist terms are not modified by the twist-three contributions. They may get corrected at the twist-four level, however. In the Wandzura-Wilczek approximation these new terms in the Fourier expansion with respect to the azimuthal angle are entirely determined by the twist-two generalized parton distributions. We also discuss more general issues such as the general form of the angular dependence of the differential cross section, the validity of factorization at the twist-three level, and the relation of generalized parton distributions to spectral functions.

Original languageEnglish (US)
Article number116002
JournalPhysical Review D
Volume64
Issue number11
StatePublished - Dec 1 2001
Externally publishedYes

Fingerprint

Twist
partons
Photon
pions
cross sections
photons
factorization
asymmetry
expansion
approximation
scattering
Cross section
Angle
Fourier Expansion
Spectral Function
Term
Asymmetry
Factorization
Charge
Scattering

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Belitsky, A., Müller, D., Kirchner, A., & Schäfer, A. (2001). Twist-three analysis of photon electroproduction off the pion. Physical Review D, 64(11), [116002].

Twist-three analysis of photon electroproduction off the pion. / Belitsky, Andrei; Müller, D.; Kirchner, A.; Schäfer, A.

In: Physical Review D, Vol. 64, No. 11, 116002, 01.12.2001.

Research output: Contribution to journalArticle

Belitsky, A, Müller, D, Kirchner, A & Schäfer, A 2001, 'Twist-three analysis of photon electroproduction off the pion', Physical Review D, vol. 64, no. 11, 116002.
Belitsky A, Müller D, Kirchner A, Schäfer A. Twist-three analysis of photon electroproduction off the pion. Physical Review D. 2001 Dec 1;64(11). 116002.
Belitsky, Andrei ; Müller, D. ; Kirchner, A. ; Schäfer, A. / Twist-three analysis of photon electroproduction off the pion. In: Physical Review D. 2001 ; Vol. 64, No. 11.
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