Pole Mass, Width, and Propagators of Unstable Fermions
Pole Mass, Width, and Propagators of Unstable Fermions
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不稳定费米子的极质量、宽度和传播者
DOI:
10.1103/physrevd.77.116012
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发表时间:
2008
影响因子:
5
通讯作者:
A. Sirlin
中科院分区:
文献类型:
--
作者:
B. Kniehl;A. Sirlin
The concepts of pole mass and width are extended to unstable fermions in the general framework of parity-nonconserving gauge theories, such as the standard model. In contrast with the conventional on-shell definitions, these concepts are gauge independent and avoid severe unphysical singularities, properties of great importance since most fundamental fermions in nature are unstable particles. General expressions for the unrenormalized and renormalized dressed propagators of unstable fermions and their field-renormalization constants are presented.