A Study of the LEP and SLD Measurements of $A_b$

Details A Study of the LEP and SLD Measurements of $A_b$ A Study of the LEP and SLD Measurements of $A_b$

1999-07-14

arxiv.org/abs/hep-ex/9907018v2

Mod.Phys.Lett. A15 (2000) 761-774

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages 7 figures 7 tables

Scientific paper

10.1142/S0217732300000748

A systematic study is made of the data dependence of the parameter $A_{\rm{b}}$, that, since 1995, has shown a deviation from the Standard Model prediction of between 2.4 and 3.1 standard deviations. Issues addressed include: the effect of particular measurements, values found by individual experiments, LEP/SLD comparison, and the treatment of systematic errors. The effect, currently at the 2.4$\sigma$ level, is found to vary in the range from 1.7$\sigma$ to 2.9$\sigma$ by excluding marginal or particularly sensitive data. Since essentially the full LEP and SLD Z decay data sets are now analysed the meaning of the deviation, (new physics, or marginal statistical fluctuation) is unlikely to be given by the present generation of colliders.

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