Deeply virtual Compton scattering amplitude in the parton model

Penttinen, M.; Polyakov, Maxim V.; Shuvaev, A. G.; Strikman, M.

doi:10.1016/s0370-2693(00)01035-2

Cited by 111 publications

(161 citation statements)

References 18 publications

(14 reference statements)

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“…Finally, to find the matrix element of the operator O ρ;j = R 2 ρ;j + 2j j+1 R 3 ρ;j , it remains to insert our findings (32) and (37) into the solution (27):…”

Section: Spin-0 Targetmentioning

confidence: 99%

Twist-three effects in two-photon processes

2000

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We give a general treatment of twist-three effects in two-photon reactions. We address the issue of the gauge invariance of the Compton amplitude in generalized Bjorken kinematics and relations of twist-three 'transverse' skewed parton distributions to twist-two ones and interaction dependent three-particle correlation functions. Finally, we discuss leading order evolution of twistthree functions and their impact on the deeply virtual Compton scattering.

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“…Finally, to find the matrix element of the operator O ρ;j = R 2 ρ;j + 2j j+1 R 3 ρ;j , it remains to insert our findings (32) and (37) into the solution (27):…”

Section: Spin-0 Targetmentioning

confidence: 99%

Twist-three effects in two-photon processes

2000

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“…The problem of the electromagnetic (QED) gauge invariance in the deeply virtual Compton scattering and similar exclusive processes has intensively been discussed during the last few years (for example, see [1][2][3][4][5][6]). This development explored the similarity with the earlier studied inclusive spin-dependent processes [7].…”

Section: Introductionmentioning

confidence: 99%

New contributions to gluon poles in direct photon production

Anikin¹,

Teryaev²

2015

Eur. Phys. J. C

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We consider the direct photon production in a two hadron collision with one of the hadrons transversely polarized. By using the contour gauge for gluon fields, we find that there are new twist-3 terms present in the hadron tensor of the considered process in addition to the standard twist-3 terms. In this work, we demonstrate that the significance of these new terms are twofold: first, they are crucial to both the QED and the QCD gauge invariance and, second, their contributions to the hadron tensor are at least the same as those from the standard ones. We also study the resulting effects which are responsible for the universality breaking of the corresponding twist-3 parton distributions.

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“…a relation which was first obtained by Penttinen, Polyakov, Shuvaev and Strikman in the parton model [8] and later confirmed in QCD by Hatta and Yoshida [9]. To the best of my knowledge this has not yet been used because it is extremely difficult to extract information on such a twist-3 GPD from experiment.…”

Section: The Kinetic Version : L Qmentioning

confidence: 91%

Orbital Angular Momentum: How to Define it and How to Measure it

Leader

2015

EPJ Web of Conferences

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Abstract. In the context of the controversy concerning the ambiguities in the definition of quark and gluon angular momentum we explain pedagogically the origin of these ambiguities and stress that there are fundamentally only three physically relevant variants. We give precise expressions for the sum rules involving them. We consider their measurement, both experimentally and on the lattice, and discuss some attempts to calculate them in models.

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Deeply virtual Compton scattering amplitude in the parton model

Abstract: We compute amplitude of deeply virtual Compton scattering in the parton model. We found that the amplitude up to the accuracy O(1/Q) depends on new skewed parton distributions (SPD's). These additional contributions make the DVCS amplitude explicitly transverse.

Cited by 111 publications

References 18 publications

Twist-three effects in two-photon processes

Twist-three effects in two-photon processes

New contributions to gluon poles in direct photon production

Orbital Angular Momentum: How to Define it and How to Measure it

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