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Width and partial widths of unstable particles.

P A Grassi1, B A Kniehl, A Sirlin

  • 1Department of Physics, New York University, New York 1003, USA.

Physical Review Letters
|February 15, 2001
PubMed
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A new definition for unstable particle decay properties, ensuring additivity and gauge independence, is proposed. This method accurately describes Z0 boson experimental data, aligning with established physics group findings.

Area of Science:

  • High-energy physics
  • Quantum field theory
  • Particle physics

Background:

  • Unstable particles require precise definitions for decay properties.
  • Existing methods may lack gauge independence or additivity.
  • Z0 boson physics is crucial for electroweak theory validation.

Purpose of the Study:

  • To propose a novel definition for branching ratios and partial widths.
  • To ensure the new definition adheres to gauge independence and additivity.
  • To validate the definition using Z0 boson experimental data.

Main Methods:

  • Development of a gauge-independent definition within gauge theory.
  • Application of the definition to the Z0 boson.
  • Comparison with experimental data and existing theoretical expressions.

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Main Results:

  • A new, consistent definition for branching ratios and partial widths is established.
  • The proposed definition correctly reproduces experimental peak cross sections for the Z0 boson.
  • The results align with the LEP Electroweak Working Group's findings to NNNLO.

Conclusions:

  • The proposed definition offers a robust framework for unstable particle decays.
  • Using the pole mass and width of the Z0 boson is essential for experimental agreement.
  • This work refines theoretical calculations in high-energy physics.