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A measurement ofΓ (Z 0b \(\Gamma ({\rm Z}^0 \to b\bar b)\)/Γ(Z 0→hadrons) using an impact parameter technique

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Zeitschrift für Physik C Particles and Fields

Abstract

The fractional partial width of theZ 0 tob quarks,\(\Gamma _{b\bar b} /\Gamma _{had} \), 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:

$$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.222 \pm 0.007(stat) \pm 0.008(sys).$$

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\(\Gamma _{c\bar c} /\Gamma _{had} = 0.171\) changes the result by an additional\(\Delta \Gamma _{b\bar b} /\Gamma _{b\bar b} = - 0.135 \times \Delta \Gamma _{c\bar c} /\Gamma _{c\bar c} \).

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OPAL Collaboration., Acton, P.D., Akers, R. et al. A measurement ofΓ (Z 0b \(\Gamma ({\rm Z}^0 \to b\bar b)\)/Γ(Z 0→hadrons) using an impact parameter technique. Z. Phys. C - Particles and Fields 60, 579–592 (1993). https://doi.org/10.1007/BF01558387

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  • DOI: https://doi.org/10.1007/BF01558387

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