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Constructing parton convolution in effective field theory.

J W Chen1, X Ji

  • 1Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.

Physical Review Letters
|October 3, 2001
PubMed
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We present a new parton convolution formalism from effective field theory to describe nucleon sea quarks and the EMC effect. This framework clarifies the role of auxiliary quantities and calculates chiral contributions to the nucleon sea.

Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Parton convolution models are crucial for understanding nucleon sea quarks and nuclear quark distributions (EMC effect).
  • Existing models rely on convolution formalisms, but their theoretical underpinnings require clarification.

Purpose of the Study:

  • To construct a parton convolution formalism from an effective field theory perspective.
  • To elucidate the significance of scheme and scale dependence in auxiliary quantities.
  • To calculate chiral contributions to the nucleon sea.

Main Methods:

  • Development of a parton convolution formalism rooted in effective field theory.
  • Analysis of scheme and scale dependence of auxiliary quantities, specifically pion distributions in a nucleon.

Related Experiment Videos

  • Calculation of leading nonanalytic chiral contributions to the isovector component of the nucleon sea.

    • Main Results:

    • A unified parton convolution formalism derived from effective field theory is established.
    • The importance of scheme and scale dependence for auxiliary quantities is demonstrated.
    • The complete leading nonanalytic chiral contribution to the isovector nucleon sea is calculated.

    Conclusions:

    • The effective field theory approach provides a robust foundation for parton convolution models.
    • Understanding auxiliary quantity dependencies is key for accurate sea quark descriptions.
    • This work offers new insights into nucleon structure and chiral dynamics.