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Now showing items 1 - 16 of 24

  • Generalized parton distributions from deep virtual compton scattering at CLAS

    M. Guidal  

    We have analyzed the beam spin asymmetry and the longitudinally polarized target spin asymmetry of the Deep Virtual Compton Scattering process, recently measured by the Jefferson Lab CLAS collaboration. Our aim is to extract information about the Generalized Parton Distributions of the proton. By fitting these data, in a largely model-independent procedure, we are able to extract numerical values for the two Compton Form Factors HIm and with uncertainties, in average, of the order of 30%.
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  • Generalized Parton Distributions from Deeply Virtual Compton Scattering at HERMES

    M. Guidal   H. Moutarde  

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  • A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

    We have developed a fitting code based on the leading-twist handbag Deep Virtual Compton Scattering (DVCS) amplitude in order to extract Generalized Parton Distribution (GPD) information from DVCS observables in the valence region. In a first stage, with simulations and pseudo-data, we show that the full GPD information can be recovered from experimental data if enough observables are measured. If only some of these observables are measured, valuable information can still be extracted, with certain observables being particularly sensitive to certain GPDs. In a second stage, we make a practical application of this code to the recent DVCS Jefferson Lab Hall-A data from which we can extract numerical constraints for the two H GPD Compton form factors.
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  • A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

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  • A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

    We have developed a fitting code based on the leading-twist handbag Deep Virtual Compton Scattering (DVCS) amplitude in order to extract Generalized Parton Distribution (GPD) information from DVCS observables in the valence region. In a first stage, with simulations and pseudo-data, we show that the full GPD information can be recovered from experimental data if enough observables are measured. If only some of these observables are measured, valuable information can still be extracted, with certain observables being particularly sensitive to certain GPDs. In a second stage, we make a practical application of this code to the recent DVCS Jefferson Lab Hall-A data from which we can extract numerical constraints for the two H GPD Compton form factors.
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  • A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

    We have developed a fitting code based on the leading-twist handbag Deep Virtual Compton Scattering (DVCS) amplitude in order to extract Generalized Parton Distribution (GPD) information from DVCS observables in the valence region. In a first stage, with simulations and pseudo-data, we show that the full GPD information can be recovered from experimental data if enough observables are measured. If only some of these observables are measured, valuable information can still be extracted, with certain observables being particularly sensitive to certain GPDs. In a second stage, we make a practical application of this code to the recent DVCS Jefferson Lab Hall-A data from which we can extract numerical constraints for the two H GPD Compton form factors.
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  • Generalized Parton Distributions and deep virtual Compton scattering

    M. Guidal  

    We give a pedagogical introduction to the field of Generalized Parton Distributions and review shortly the experimental situation and perspective for Deep Virtual Compton Scattering.
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  • Generalized Parton Distributions and deep virtual Compton scattering

    M. Guidal  

    We give a pedagogical introduction to the field of Generalized Parton Distributions and review shortly the experimental situation and perspective for Deep Virtual Compton Scattering.
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  • Deep Virtual Compton Scattering and the Nucleon Generalized Parton Distributions

    M. Guidal  

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  • Recent experimental results on Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

    We review and discuss briefly the recent experimental results on deep virtual Compton scattering on the proton. With the variety of independent observables beginning to be available and, in some instances, some very high precision data, some first global analysis for this process can be started, based on dedicated fitter codes, aiming at revealing the generalized parton distributions content of the nucleon. [All rights reserved Elsevier].
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  • Recent experimental results on Deep Virtual Compton Scattering and Generalized Parton Distributions

    M. Guidal  

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  • Pion and kaon photoproduction at high energies: forward and intermediate angles

    M. Guidal   J.-M. Laget   M. Vanderhaeghen  

    A model for high energy pion and kaon photoproduction (E gammagsim4 GeV) is presented which interpolates between the low and higher momentum transfer regions. At low momentum transfer (which is described in terms of Regge trajectory exchanges), the model is able to give an economical description of unpolarized and polarized data for both the charged and neutral pion photoproduction reactions as well as for K +Lambda and K +Sigma photoproduction data, available at high energy. At higher momentum transfer, an extrapolation based on saturating Regge trajectories, and which satisfies scaling laws at asymptotically large transfers, is found able to describe the few existing gammaprarrnpi + data. The model can be used as a guidance to interpret forthcoming data at larger momentum transfers
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  • Constraints on the generalized parton distribution from deep virtual Compton scattering measured at HERMES

    M. Guidal  

    We have analyzed the longitudinally polarized proton target asymmetry data of the Deep Virtual Compton process recently published by the HERMES Collaboration in terms of Generalized Parton Distributions. We have fitted these new data in a largely model-independent fashion and the procedure results in numerical constraints on the Compton Form Factor. We present its t- and ξ-dependencies. We also find improvement on the determination of two other Compton Form Factors, HRe and HIm.
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  • Constraints on the generalized parton distribution from deep virtual Compton scattering measured at HERMES

    M. Guidal  

    We have analyzed the longitudinally polarized proton target asymmetry data of the Deep Virtual Compton process recently published by the HERMES Collaboration in terms of Generalized Parton Distributions. We have fitted these new data in a largely model-independent fashion and the procedure results in numerical constraints on the Compton Form Factor. We present its t- and ξ-dependencies. We also find improvement on the determination of two other Compton Form Factors, HRe and HIm.
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  • Pseudoscalar meson photoproduction at high energies: from the Regge regime to the hard scattering regime

    M. Guidal   J.-M. Laget   M. Vanderhaeghen  

    A model for high energy pion photoproduction is presented which interpolates between the low and high momentum transfer regions. At low momentum transfer (which is described in terms of Regge trajectory exchanges), the model is able to give an economical description of the numerous high energy unpolarized and polarized gammaNrarrpiN data. At higher momentum transfer, a description based on saturating Regge trajectories and which satisfies quark counting rules at asymptotically large transfers, is found able to describe the few existing gammaprarrnpi + data. The model can be used as a guidance to interpret forthcoming data at large momentum transfers
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  • Generalized parton distributions: experimental aspects

    M. Guidal  

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