Hadron optics in three-dimensional invariant coordinate space from deeply virtual Compton scattering

Brodsky, Stanley J.; Chakrabarti, Dipankar; Harindranath, A.; Mukherjee, Asmita; Vary, James P.

doi:10.1103/physrevd.75.014003

Cited by 72 publications

(68 citation statements)

References 56 publications

(92 reference statements)

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“…amplitude with respect to the skewness parameter provides an image of the target with respect to the longitudinal degrees of freedom [61,62]. The problem of deconvolution can be overcome to some extent either by a realistic model, which we at present do not have, or by a hypothesis about the form of skewness dependence.…”

Section: Introductionmentioning

confidence: 99%

Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond

2008

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Combining dispersion and operator product expansion techniques, we derive the conformal partial wave decomposition of the virtual Compton scattering amplitude in terms of complex conformal spin to twist-two accuracy. The perturbation theory predictions for the deeply virtual Compton scattering (DVCS) amplitude are presented in next-to-leading order for both conformal and modified minimal subtraction scheme. Within a conformal subtraction scheme, where we exploit predictive power of conformal symmetry, the radiative corrections are presented up to next-to-nextto-leading order accuracy. Here, because of the trace anomaly, the mixing of conformal moments of generalized parton distributions (GPD) at the three-loop level remains unknown. Within a new proposed parameterization for GPDs, we then study the convergence of perturbation theory and demonstrate that our formalism is suitable for a fitting procedure of DVCS observables.

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Section: Introductionmentioning

confidence: 99%

Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond

2008

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“…The distributions in the LF direction σ typically display diffraction patterns arising from the interference of the initial and final state LFWFs [36,38]. Measurements of DVCS can thus provide a detailed test of AdS/CFT predictions for hadronic light-front wavefunctions.…”

Section: Other Topicsmentioning

confidence: 99%

Novel QCD Phenomena in Deep Inelastic Lepton Scattering

Brodsky¹

2008

Proceedings of the XVI International Workshop on Deep-Inelastic Scattering and Related Topics

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I discuss several novel phenomenological features of QCD which are observable in deep inelastic lepton-nucleon and lepton-nucleus scattering. Initial-and final-state interactions from gluon exchange, normally neglected in the parton model, have a profound effect on QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, the diffractive contribution to deep inelastic scattering, and the breakdown of the pQCD Lam-Tung relation in Drell-Yan reactions. Leading-twist diffractive processes in turn lead to nuclear shadowing and non-universal antishadowing-physics not incorporated in the light-front wavefunctions of the nucleus computed in isolation.

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“…The distributions in the LF direction σ typically display diffraction patterns arising from the interference of the initial and final state LFWFs [104,105]. All of these processes can provide a detailed test of the AdS/CFT LFWFs predictions.…”

Section: Pos(high-pt Physics09)013mentioning

confidence: 99%

Novel Aspects of QCD in High Transverse Momentum Production Processes at RHIC and the LHC

Brodsky¹

2010

Proceedings of 4th International Workshop High-pT Physics at LHC 09 — PoS(High-pT Physics09)

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The presence of direct higher-twist processes, where a proton is produced directly in the hard subprocess, can explain the "baryon anomaly" -the large proton-to-pion ratio seen at RHIC in high centrality heavy ion collisions. Direct hadronic processes can also account for the deviation from leading-twist pQCD scaling at fixedRescattering interactions from gluon-exchange, normally neglected in the parton model, have a profound effect in QCD hardscattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam-Tung relation in DrellYan reactions, nuclear shadowing -all leading-twist dynamics not incorporated in the light-front wavefunctions of the target computed in isolation. Antishadowing is shown to be quark flavor specific and thus different in charged and neutral deep inelastic lepton-nucleus scattering. Other aspects of quantum effects in heavy ion collisions include hidden color in nuclear wavefunctions, the use of diffraction to materialize the Fock states of a hadronic projectile and test QCD color transparency, and the important consequences of color-octet intrinsic heavy quark distributions in the proton for particle and Higgs production at high x F . The "ridge" -the same-side long-range rapidity correlation observed at RHIC in high centrality heavy ion collisions is suggested as due to the imprint of semihard DGLAP gluon radiation from initial-state partons which have transverse momenta biased toward the trigger. I also discuss how the AdS/CFT correspondence between Anti-de Sitter space and conformal gauge theories allows one to compute the analytic form of frame-independent light-front wavefunctions of mesons and baryons and to compute quark and gluon hadronization at the amplitude level. Finally, the BLM method for determining the renormalization scale in pQCD calculations is reviewed.

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Hadron optics in three-dimensional invariant coordinate space from deeply virtual Compton scattering

Cited by 72 publications

References 56 publications

Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond

Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond

Novel QCD Phenomena in Deep Inelastic Lepton Scattering

Novel Aspects of QCD in High Transverse Momentum Production Processes at RHIC and the LHC

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