Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-13
Phys.Rev.Lett.84:212-215,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages of ReVTeX, 2 figures
Scientific paper
10.1103/PhysRevLett.84.212
A new analysis of the hadronic peak cross section at LEP 1 implies a small amount of missing invisible width in Z decays, while the effective weak charge in atomic parity violation has been determined recently to 0.6% accuracy, indicating a significantly negative S parameter. As a consequence of these two deviations, the data are described well if the presence of an additional Z' boson, such as predicted in Grand Unified Theories, is assumed. Moreover, the data are now rich enough to study an arbitrary extra Z' boson and to determine its couplings in a model independent way. An excellent best fit to the data is obtained in this case, suggesting the possibility of a family non-universal Z' with properties similar to ones predicted in a class of superstring theories.
Erler Jens
Langacker Paul
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