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Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

Constraining quark angular momentum through semi-inclusive measurements.

Alessandro Bacchetta1, Marco Radici

  • 1Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy. alessandro.bacchetta@unipv.it

Physical Review Letters
|December 21, 2011
PubMed
Summary

Researchers explored quark angular momentum by linking generalized parton distributions to Sivers distributions. This approach successfully fits nucleon magnetic moments and spin asymmetries, offering a new method to quantify quark spin.

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Area of Science:

  • * Nuclear Physics
  • * Particle Physics
  • * Quantum Chromodynamics

Background:

  • * Determining quark angular momentum is crucial for understanding nucleon structure.
  • * Generalized Parton Distributions (GPDs) and Sivers distributions are key theoretical tools.

Purpose of the Study:

  • * To establish a connection between GPD E and the Sivers transverse-momentum distribution.
  • * To enable simultaneous fitting of nucleon magnetic moments and semi-inclusive spin asymmetries.
  • * To provide a method for quantifying quark angular momentum.

Main Methods:

  • * Utilized model calculations and theoretical considerations to link GPD E and Sivers distributions.
  • * Employed fitting procedures for nucleon magnetic moments.
  • * Analyzed semi-inclusive single-spin asymmetries.

Main Results:

  • * A successful simultaneous fit of nucleon magnetic moments and spin asymmetries was achieved.
  • * The assumed connection between GPD E and Sivers distributions was validated.
  • * Additional constraints were imposed on the Sivers function.

Conclusions:

  • * The study presents a plausible pathway for quantifying quark angular momentum.
  • * The findings offer new insights into the internal spin structure of nucleons.
  • * This work bridges theoretical concepts with experimental observables.