Publication Type

Journal Article

Version

Postprint

Publication Date

5-1997

Abstract

ALEPH's published measurement of Rb = Γ(Ζ → bb̄)/Γ(Ζ → hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the b/c hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of Rb is measured to be 0.2167 ± 0.0011 (stat) ± 0.0013 (syst).

Discipline

Physics

Research Areas

Data Management and Analytics

Publication

Physics Letters B

Volume

401

Issue

1-2

First Page

150

Last Page

162

ISSN

0370-2693

Identifier

10.1016/S0370-2693(97)00406-1

Publisher

Elsevier

Embargo Period

8-23-2017

Copyright Owner and License

Authors

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Additional URL

http://doi.org/10.1016/S0370-2693(97)00406-1

Included in

Physics Commons

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