A measurement ofΓ (Z 0→b $$\Gamma ({\rm Z}^0 \to b\bar b)$$ /Γ(Z 0→hadrons) using an impact parameter technique
Acton, P. D. ; Akers, R. ; Alexander, G. ; Allison, J. ; Anderson, K. J. ; Arcelli, S. ; Astbury, A. ; Axen, D. ; Azuelos, G. ; Baines, J. T. M. ; Ball, A. H. ; Banks, J. ; Barlow, R. J. ; Barnett, S. ; Bartoldus, R. ; Batley, J. R. ; Beaudoin, G. ; Beck, A. ; Beck, G. A. ; Becker, J. ; Beeston, C. ; Behnke, T. ; Bell, K. W. ; Bella, G. ; Bentkowski, P.
Springer
Published 1993
Springer
Published 1993
| ISSN: |
1434-6052
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Physics
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| Notes: |
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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| Type of Medium: |
Electronic Resource
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| URL: |