Measurement of αs from the structure of particle clusters produced in hadronic Z decays
1991
Abstract Using 106 000 hadronic events obtained with the
ALEPHdetector at LEP at energies close to the Z resonance peak, the strong coupling constant α s is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust, C -parameter and
oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum
scaled invariantmass cut, Y cut , before these variables are computed. The combined result from all shape variables of pre-clustered events is α s ( M Z 2 = 0.117±0.005 for a renormalization scale μ= 1 2 M Z . For μ values between M Z and the b-quark mass, the result changes by −0.009 +0.006 .
Keywords:
-
Correction
-
Source
-
Cite
-
Save
19
References
55
Citations
NaN
KQI