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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Access to decoupled information of Generalized Parton Distributions (GPDs) via Double Deeply Virtual Compton Scattering (DDVCS)

20 Aug 2019, 09:15
20m
Guihu Room (Guilin Bravo Hotel, Guilin, China)

Guihu Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 6: QCD and hadron structure Session 6: QCD and hadron structure

Speaker

Mr Shengying Zhao (Institut de Physique Nucléaire d’Orsay, CNRS-IN2P3, Université Paris-Sud & Paris-Saclay, 91406 Orsay, France)

Description

The Generalized Parton Distributions (GPDs) are the appropriate framework for a universal description of the partonic structure of the nucleon. Encoding the correlations between the elementary constituents of the nucleon, GPDs allow a 3-dimensional imaging of the nucleon from the dynamical link between the transverse position and the longitudinal momentum of partons. Double Deeply Virtual Compton Scattering (DDVCS) corresponds to the scattering from the nucleon of a virtual photon that finally generates a lepton pair $eN \rightarrow eN \gamma^* \rightarrow eN l\bar{l}$ where the final leptons can be either an $e^+e^-$ or a $\mu^+\mu^-$ pair. The virtuality of the final photon allows to investigate the dependences of the GPDs on the initial and transferred momentum in a decorrelated way [1,2]. This unique feature of DDVCS is of relevance, among others, for the determination of the transverse parton densities and the distribution of nuclear forces. This presentation will discuss a future “full-scale” DDVCS experiment in the context of JLab 12 GeV, model-predicted pseudo-data, and extraction of the relevant GPDs information based on a fitter algorithm.

Primary author

Mr Shengying Zhao (Institut de Physique Nucléaire d’Orsay, CNRS-IN2P3, Université Paris-Sud & Paris-Saclay, 91406 Orsay, France)

Presentation materials