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Related Experiment Videos

Generalized parton distributions from lattice QCD.

M Göckeler1, R Horsley, D Pleiter

  • 1Institut für Theoretische Physik, Universität Leipzig, D-04109 Leipzig, Germany.

Physical Review Letters
|March 6, 2004
PubMed
Summary
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This study calculates the quark contribution to proton spin using lattice QCD. Results assess the combined spin and orbital angular momentum of quarks within the proton.

Area of Science:

  • Nuclear Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • The proton spin crisis highlighted the need to understand quark contributions.
  • Generalized Parton Distributions (GPDs) offer insights into nucleon structure.
  • Quark spin and orbital angular momentum are key components of proton spin.

Purpose of the Study:

  • To compute the first moment of twist-two GPDs for the proton.
  • To quantify the total quark spin and orbital angular momentum contribution to the proton's spin.

Main Methods:

  • Utilizing a quenched lattice Quantum Chromodynamics (QCD) calculation.
  • Focusing on the first moment of twist-two generalized parton distribution functions.

Main Results:

Related Experiment Videos

  • The first moment of twist-two GPDs was successfully calculated.
  • The total quark spin and orbital angular momentum contribution to proton spin was assessed.

Conclusions:

  • This work provides crucial data for understanding the proton's spin structure.
  • Lattice QCD calculations are a viable tool for probing nucleon internal dynamics.