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 language | English (US) |
|---|---|
| Article number | 116002 |
| Journal | Physical Review D |
| Volume | 64 |
| Issue number | 11 |
| State | Published - Dec 1 2001 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Mathematical Physics
Cite this
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 journal › Article
}
TY - JOUR
T1 - Twist-three analysis of photon electroproduction off the pion
AU - Belitsky, Andrei
AU - Müller, D.
AU - Kirchner, A.
AU - Schäfer, A.
PY - 2001/12/1
Y1 - 2001/12/1
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0035580987&partnerID=8YFLogxK
M3 - Article
VL - 64
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 11
M1 - 116002
ER -