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Delta-->Ngamma in large-N(c) QCD.

Elizabeth Jenkins1, Xiangdong Ji, Aneesh V Manohar

  • 1University of California, San Diego, 9500 Gilman Drive, La Jolla 92093-0319, USA. ejenkins@ucsd.edu

Physical Review Letters
|December 18, 2002
PubMed
Summary

The study explores the Delta(+) to gamma decay within Quantum Chromodynamics (QCD) using the 1/N(c) expansion. Researchers determined the ratio of helicity amplitudes, offering insights into particle physics interactions.

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Area of Science:

  • * Particle Physics
  • * Quantum Chromodynamics (QCD)

Background:

  • * The Delta(+)-->pgamma decay is a fundamental process in particle physics.
  • * Understanding this decay provides insights into the strong nuclear force and quark interactions.

Purpose of the Study:

  • * To analyze the Delta(+)-->pgamma decay using the 1/N(c) expansion of QCD.
  • * To determine the ratio of helicity amplitudes and multipole amplitudes for this decay.

Main Methods:

  • * Application of the 1/N(c) expansion, a theoretical framework in Quantum Chromodynamics.
  • * Calculation of helicity and multipole amplitudes for the Delta(+)-->pgamma decay.

Main Results:

  • * The ratio of helicity amplitudes A(3/2)/A(1/2) was determined to be sqrt[3]+O(1/N(2)(c)).
  • * The ratio of multipole amplitudes E2/M1 is predicted to be of the order 1/N(2)(c).

Conclusions:

  • * The 1/N(c) expansion provides a valuable tool for studying weak decays of baryons.
  • * The results offer quantitative predictions for the Delta(+)-->pgamma decay, testable with experimental data.

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