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- W2915972912 abstract "The fractional partial width of theZ 0 tob quarks, $$Gamma _{bbar b} /Gamma _{had} $$ , has been measured by OPAL using an impact parameter technique. The method has been developed using 130 000 hadronic events collected by OPAL in 1990. We find: $$frac{{Gamma _{bbar b} }}{{Gamma _{had} }} = 0.222 pm 0.007(stat) pm 0.008(sys).$$ The measurement assumes the relative rates of theZ 0 touds andc quarks given by the Standard Model. Varying the charm fraction from the Standard Model value of $$Gamma _{cbar c} /Gamma _{had} = 0.171$$ changes the result by an additional $$Delta Gamma _{bbar b} /Gamma _{bbar b} = - 0.135 times Delta Gamma _{cbar c} /Gamma _{cbar c} $$ ." @default.
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