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Connected-sea partons.

Keh-Fei Liu1, Wen-Chen Chang, Hai-Yang Cheng

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|February 2, 2013
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Summary
This summary is machine-generated.

This study distinguishes the connected sea (CS) and disconnected sea (DS) in nucleon structure. Researchers extracted these components for ū(x) + d(x), finding they equally share momentum fraction.

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Area of Science:

  • Nuclear Physics
  • Quantum Chromodynamics (QCD)
  • Particle Physics

Background:

  • The nucleon sea comprises connected sea (CS) and disconnected sea (DS) components, crucial for understanding nucleon structure.
  • Path-integral formalism of the hadronic tensor provides a theoretical framework for these sea components.

Purpose of the Study:

  • To differentiate and quantify the connected sea (CS) and disconnected sea (DS) contributions to the ū(x) + d(x) parton distribution.
  • To investigate the Bjorken x dependence of CS and DS components.

Main Methods:

  • Utilizing lattice QCD calculations for moments of parton distributions.
  • Incorporating recent strangeness parton distribution data and the CT10 global fit.
  • Analyzing the ratio of strange to u(d) moments in disconnected insertions.

Main Results:

  • Successfully extracted distinct CS and DS components for ū(x) + d(x).
  • Observed a Bjorken x dependence for CS and DS qualitatively aligning with theoretical expectations.
  • Determined that CS and DS equally partition the momentum fraction of ū(x) + d(x) at Q² = 2.5 GeV².

Conclusions:

  • The study provides a method to disentangle CS and DS contributions in lattice QCD.
  • Findings offer crucial insights for future global analyses of parton distributions.
  • The equal momentum sharing highlights the significant role of both sea components.