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- W2782702575 abstract "We report on a measurement of the ratio of the strong coupling constants $$alpha _s (M_{Z^0 } )$$ for various data samples with different quark flavour compositions obtained frome + e − annihilation at LEP. We select events with muons, electrons, andD *± mesons from charm and bottom decays, events with highly energeticK 0 mesons originating predominantly from strange quarks, and events with highly energetic stable charged particles from a combination of up, down and strange quarks. From the jet production rates in these events we obtain from these samples the relative value of αs for the individual quark flavours as $$begin{gathered} frac{{alpha _s^b }}{{alpha _s^{udsc} }} = 1.017 pm 0.036,frac{{alpha _s^c }}{{alpha _s^{udsb} }} = 0.918 pm 0.115, hfill frac{{alpha _s^s }}{{alpha _s^{udcb} }} = 1.158 pm 0.164,frac{{alpha _s^{uds} }}{{alpha _s^{cb} }} = 1.038 pm 0.221, hfill end{gathered}$$ with quadratically combined statistical and systematic errors. We also compare the αs values for quarks of diffrent weak isospin, charge and generation. No evidence for a dependence of αs on any of these quark properties is observed. Finally, combining all samples and determining the α s /α s incl ratio for each flavour, we do not find any dependence of the strong coupling constant on flavour." @default.
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