Twist-three effects in two-photon processes

Belitsky, Andrei; Müller, Dieter

doi:10.1016/s0550-3213(00)00542-3

Cited by 121 publications

(209 citation statements)

References 30 publications

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“…However, they are affected by non-integrable singularities, which appear to LO in α s and are induced by large size quark-antiquark configurations of the produced meson [ 4]. In the case of photon leptoproduction 1/Q suppressed contributions are calculable to LO [ 60] and NLO [ 61] accuracy. In fact, they complete the azimuthal angular dependence of the cross section [ 26].…”

Section: Beyond Leading Order Predictionsmentioning

confidence: 99%

Generalized Parton Distributions – theoretical review –

Müller

2005

Nuclear Physics A

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In this talk an introduction to generalized parton distributions is given. Recent developments are shortly reviewed, including non-perturbative calculations, phenomenological aspects and evaluation of higher order perturbative and power corrections. In this talk an introduction to generalized parton distributions is given. Recent developments are shortly reviewed, including non-perturbative calculations, phenomenological aspects and evaluation of higher order perturbative and power corrections.

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Section: Beyond Leading Order Predictionsmentioning

confidence: 99%

Generalized Parton Distributions – theoretical review –

Müller

2005

Nuclear Physics A

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“…So, this effect is a particularity of the off-forward matrix element only. An interesting study using this approach will be to investigate the Wandzura-Wilczek relation [14] for the off-forward matrix elements of the transverse vector and axial vector operators in perturbation theory, for dressed quark states. We plan to undertake such studies in the near future.…”

Section: Helicity Flip Part Of the Transverse Componentmentioning

confidence: 99%

Off-forward matrix elements in light-front Hamiltonian QCD

Mukherjee

Vanderhaeghen

2002

Physics Letters B

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We investigate the off-forward matrix element of the light cone vector operator for a dressed quark state in light-front Hamiltonian perturbation theory. We obtain the corresponding splitting functions in a straightforward way. We show that the end point singularity is canceled by the contribution from the normalization of state. Considering mixing with the gluon operator, we verify the helicity sum rule in perturbation theory. We show that the quark mass effects are suppressed in the plus component of the matrix element but in the transverse component, they are not suppressed. We emphasize that this is a particularity of the off-forward matrix element and is absent in the forward case.

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“…[17] by an explicit twist-three analysis at leading order of perturbation theory. To leading twist accuracy, it reads…”

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Exclusive Electroproduction of Lepton Pairs as a Probe of Nucleon Structure

Belitsky

Müller

2003

Phys. Rev. Lett.

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We suggest the measurement of exclusive electroproduction of lepton pairs as a tool to study inter-parton correlations in the nucleon via generalized parton distributions in the kinematical region where this process is light-cone dominated. We demonstrate how the single beam-spin asymmetry allows to perform such kind of analysis and give a number of predictions for several experimental setups. We comment on other observables which allow for a clean separation of different species of generalized parton distributions.

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Twist-three effects in two-photon processes

Cited by 121 publications

References 30 publications

Generalized Parton Distributions – theoretical review –

Generalized Parton Distributions – theoretical review –

Off-forward matrix elements in light-front Hamiltonian QCD

Exclusive Electroproduction of Lepton Pairs as a Probe of Nucleon Structure

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