Determining $α_s$ from Measurements at $Z$: How Nature Prompts us about New Physics

Details Determining $α_s$ from Measurements at $Z$: How Nature Prompts us about New Physics Determining $α_s$ from Measurements at $Z$: How Nature Prompts us about New Physics

1995-01-06

arxiv.org/abs/hep-ph/9501222v3

Mod.Phys.Lett. A10 (1995) 605-614

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex file, 9 pages, no figures; 2 extra references added

Scientific paper

10.1142/S0217732395000648

The value of $\alpha_s (M_Z)$ emerging from the so called global fits based mainly on the data at the $Z$ peak (and assuming the standard model) is three standard deviations higher than the one stemming from the low-energy phenomenology. The corresponding value of $\Lambda_{\rm QCD}$ is very large, $\sim$ 500 MeV, and is incompatible with crucial features of QCD. If persists, the discrepancy should be interpreted as due to contributions to the $Z$-quark-antiquark vertices which go beyond the standard model.

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