THEORETICAL CONSIDERATIONS CONCERNING THE Z0 MASS

被引:185
作者
SIRLIN, A
机构
[1] Department of Physics, New York University, New York
关键词
D O I
10.1103/PhysRevLett.67.2127
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We compare two previously introduced theoretical definitions of the Z0 mass and show that one of them, frequently used, is gauge dependent in O(alpha-3) in a wide class of gauges and in O(alpha-2) in the complementary class. We then discuss a slightly modified version that circumvents these problems, is endowed with desirable theoretical properties, and can be identified with the mass measured at the CERN e+e- collider LEP. The simple formulation that emerges is applied to illustrate properties of the physical amplitude, related to gauge invariance, and the role played by the two definitions of mass.
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页码:2127 / 2130
页数:4
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