Deeply virtual Compton scattering on a photon and generalized parton distributions in the photon

Friot, Samuel; Pire, B.; Szymanowski, L.

doi:10.1016/j.physletb.2006.12.038

Cited by 36 publications

(66 citation statements)

References 24 publications

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“…We have chosen the light-front gauge A + = 0. As pointed out in [4], there is also the photon operator which mixes with the quark operator, it contributes at the same order in α in the scattering amplitude. However here we calculate the matrix element rather than the amplitude of the process and the contribution to the matrix element of the photon operator comes at zeroth order in α. F q andF q can be calculated using the Fock space expansion of the state, which can be written as [4]…”

Section: Gpds Of the Photonmentioning

confidence: 87%

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Generalized parton distributions of the photon

Mukherjee¹,

Nair²

2013

Proceedings of 10th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology) —

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Section: Gpds Of the Photonmentioning

confidence: 87%

“…Leading order evolution of the photon GPDs has been calculated in [4] for non-zero ζ. The mass terms in the vertex give subdominant contributions which we included.…”

Section: Gpds Of the Photonmentioning

confidence: 99%

Generalized parton distributions of the photon

Mukherjee¹,

Nair²

2013

Proceedings of 10th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology) —

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“…It can be easily established that this representation yields the result of the independent GPD calculation [101]. The fact that the GDA/GPD is expressed by only one function ̟ i /ω i implies GPD-duality, i.e., the cross talk of the central and outer regions in which the GPD is given by respectively.…”

Section: A Gpd Toy Example: Photon Twist-two Gpdmentioning

confidence: 89%

Generalized Parton Distributions: Visions, Basics, and Realities

Müller

2014

Few-Body Syst

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“…This bound was recently studied [230] for the case of pion-photon transition GPD [231] and the consideration of photonic GPD in the perturbative regime allows explicit tests of these inequalities [232].…”

Section: Generalised Parton Distributionsmentioning

confidence: 99%

Spin observables and spin structure functions: Inequalities and dynamics

et al. 2009

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Model-independent identities and inequalities which relate the various spin observables of collisions in nuclear and particle physics are reviewed in a unified formalism. Their physical interpretation and their implications for dynamical models are also discussed. These constraints between observables can be obtained in several ways: from the explicit expression of the observables in terms of a set of helicity or transversity amplitudes, a non-trivial algebraic exercise which can be preceded by numerical simulation with randomly chosen amplitudes, from anticommutation relations, or from the requirement that any polarisation vector is less than unity. The most powerful tool is the positivity of the density matrices describing the spins in the initial or final state of the reaction or its crossed channels. The inequalities resulting from positivity need to be projected to single out correlations between two or three observables. The quantum aspects of the information carried by spins, in particular entanglement, are considered when deriving and discussing the constraints Several examples are given, with a comparison with experimental data in some cases. For the exclusive reactions, the cases of the strangeness-exchange proton-antiproton scattering and the photoproduction of pseudoscalar mesons are treated in some detail: all triples of observables are constrained, and new results are presented for the allowed domains. The positivity constraints for total cross-sections and for the simplest observables of single-particle inclusive reactions are reviewed. They also apply to spin-dependent structure functions and parton distributions, both integrated or transverse-momentum dependent. The corresponding inequalities are shown to be preserved by the evolution equations of quantum chromodynamics.Inequalities on spin observables 3

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Deeply virtual Compton scattering on a photon and generalized parton distributions in the photon

Cited by 36 publications

References 24 publications

Generalized parton distributions of the photon

Generalized parton distributions of the photon

Generalized Parton Distributions: Visions, Basics, and Realities

Spin observables and spin structure functions: Inequalities and dynamics

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