What Can We Learn from GPDs about the Structure of Protons?

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SUMMARY

The discussion centers on Deeply Virtual Compton Scattering (DVCS) and its role in accessing generalized parton distributions (GPDs). GPDs enable the computation of the energy-momentum tensor (Tμν) of partons, providing insights into their structure within nucleons. The conversation highlights the potential of GPDs to measure additional physical quantities related to nucleon structure beyond Tμν. Participants express a need for further exploration of what can be measured inside hadrons using GPDs.

PREREQUISITES
  • Understanding of Deeply Virtual Compton Scattering (DVCS)
  • Familiarity with generalized parton distributions (GPDs)
  • Knowledge of energy-momentum tensor (Tμν) concepts
  • Basic principles of quantum chromodynamics (QCD)
NEXT STEPS
  • Research the latest findings on generalized parton distributions (GPDs)
  • Explore the implications of DVCS experiments at Jefferson Lab (JLab) Hall-A
  • Investigate the relationship between GPDs and graviton scattering
  • Study the measurement techniques for Tμν in partons
USEFUL FOR

Physicists, researchers in particle physics, and students interested in the structure of nucleons and the applications of GPDs in understanding hadronic phenomena.

humanino
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I hear about a process called DVCS ("Deeply Virtual Compton Scattering") which should allow access to new distributions of parton called "generalized" distributions. Does someone know what's new about those "GPD" ?
DVCS at JLab Hall-A
 
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OK, I see nobody really cares about quarks phenomenology. So I'm going to answer to myself. I am squatting your forum. (^_^)

I read that GPD would actually allow one to compute the T_\mu\nu of the partons ! (Energy-Momentum tensor) From a "naive" point of view, the only other way I can imagine to measure T_\mu\nu for the partons would be graviton scattering ! Therefore, my question was precisely : what physical quantity can be accessed through GPD (besides T_\mu\nu of partons) and what else remain to be measured inside a nucleon (or generally speaking a hadron), apart from what can be accessed with GPD ?
 

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