Nucleon Compton scattering in perturbative QCD

Kronfeld, A. S.; Nizic, B.

doi:10.1103/physrevd.44.3445

Cited by 59 publications

(98 citation statements)

References 22 publications

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“…In Ref. [Kro91] the propagator singularities were integrated by decomposing the propagators into a principal value (offshell) part and an on-shell part. To compare these methods, we implemented both of them and found for the +iǫ method differences of the order of 10% for every diagram as compared with the result of our final method.…”

Section: Compton Scattering In Pqcdmentioning

confidence: 99%

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Virtual Compton scattering off the nucleon

Guichon

Vanderhaeghen

1998

Progress in Particle and Nuclear Physics

160

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We review the recent developments of virtual Compton scattering. We focus on the kinematical regimes which look the most promising. The threshold regime gives access to the generalized polarizabilities of the proton. The hard scattering regime allows tests of perturbative QCD predictions and of the valence quark wave function. The Bjorken regime is closely related to deep inelastic scattering. It gives access to the off-forward parton distributions which generalize the ordinary parton distributions and may shed a new light on the spin problem. For each regime we discuss the experimental perspectives and the role of the Bethe-Heitler background.

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Section: Compton Scattering In Pqcdmentioning

confidence: 99%

“…There one can test the prediction of PQCD in the framework of the Hard Scattering Picture (HSP) [Bro80]. In particular the phase of the amplitude which is predicted to be large [Far90a], [Kro91] can be accessed through the interference between the BH and the VCS processes.…”

Section: Introductionmentioning

confidence: 99%

Virtual Compton scattering off the nucleon

Guichon

Vanderhaeghen

1998

Progress in Particle and Nuclear Physics

160

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“…The asymptotic limit of the WACS cross section, as predicted by QCD factorization, has been studied in many theoretical works [5][6][7][8]. It was found that the leading-twist contribution described by the hard two-gluon exchange between three collinear quarks predicts much smaller cross sections than is observed in experiments.…”

Section: Introductionmentioning

confidence: 99%

Wide Angle Compton Scattering within the SCET factorization Framework

Kivel

2016

EPJ Web of Conferences

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Abstract. Existing data for the electromagnetic proton form factors and for the cross section of the wide angle Compton scattering (WACS) show that the hard two-gluon exchange mechanism (collinear factorization) is still not applicable in the kinematical region where Mandelstam variables s ∼ −t ∼ −u are about few GeV 2 . On the other hand these observables can be described in phenomenological models where spectator quarks are soft which assumes a large contribution due to the soft-overlap mechanism. It turns out that the simple QCD factorization picture is not complete and must also include the soft-overlap contribution which can be described as a certain matrix element in the soft collinear effective theory (SCET). Then the leading power contribution to WACS amplitude is described as a sum of the hard-and soft-spectator contributions. The existing experimental data allows one to check certain conclusions based on the assumption about dominant role of the soft-spectator mechanism.

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“…The only data in the few GeV regime from the pioneering experiment at Cornell [13] are approximately consistent with constituent scaling, albeit with modest statistical precision. Nevertheless, detailed calculations show that the pQCD cross section underpredicts the data by factors of at least ten [6], thereby calling into question the applicability of the pQCD mechanism in this energy range. On the other hand, more recent calculations using the handbag approach have reproduced the Cornell cross-section data to better than a factor of two [8,9].…”

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confidence: 99%

“…In the perturbative QCD (pQCD) approach (Fig. 1a) [4,5,6,7], three active quarks share the transferred momentum by the exchange of two hard gluons. In the handbag approach (Fig.…”

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Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

Hamilton

2005

Phys. Rev. Lett.

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Compton scattering from the proton was investigated at s = 6.9 GeV 2 and t = -4.0 GeV 2 via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in excellent agreement with a prediction based on a reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton and in disagreement with a prediction of pQCD based on a two-gluon exchange mechanism.PACS numbers: 13.60. Fz,24.85.+p Real Compton Scattering (RCS) from the nucleon with s, −t, and −u values large compared to Λ 2 QCD is a hard exclusive process which provides access to information about nucleon structure complementary to high Q 2 elastic form factors [1,2] and Deeply Virtual Compton Scattering [3]. A common feature of these reactions is a high energy scale, leading to factorization of the scattering amplitude into a hard perturbative amplitude, which de-

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Nucleon Compton scattering in perturbative QCD

Cited by 59 publications

References 22 publications

Virtual Compton scattering off the nucleon

Virtual Compton scattering off the nucleon

Wide Angle Compton Scattering within the SCET factorization Framework

Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

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