Width and partial widths of unstable particles |
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Authors: | Grassi P A Kniehl B A Sirlin A |
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Institution: | Department of Physics, New York University, New York 1003, USA. |
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Abstract: | 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 Z0-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 Z0 boson is employed. |
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