Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 3, Pages 389-392Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.389
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In the gauge theory context, a definition of branching ratios and partial widths of unstable particles is proposed that satisfies the basic principles of additivity and gauge-independence. A simpler definition, similar to the conventional one, is examined in the Z(0)-boson case. In order to establish contact with experiment, we show that it leads to a peak cross section that justifies the expression used by the LEP Electroweak Working Group through next-to-next-to-leading order, provided that the pole rather than the on-shell mass and width of the Z(0) boson is employed.
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