Phys. Rev. Lett. 67, 3347–3350 (1991)Measurement of the bb¯ fraction in hadronic Z0 decays with precision vertex detectorsReceived 5 August 1991; published in the issue dated 9 December 1991 We have measured the fraction of bb¯ events in hadronic Z0 decays, Rbb¯, using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bb¯ events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find Rbb¯=0.251±0.049±0.030, in good agreement with other measurements and the standard model prediction. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.3347
DOI:
10.1103/PhysRevLett.67.3347
PACS:
13.38.+c, 13.65.+i
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