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A preliminary measurement of R{sub b} = {Gamma}({Zeta}{degrees} {yields} b{bar b})/{Gamma}({Zeta}{degrees} {yields} hadrons) at SLD

Conference ·
OSTI ID:138663
 [1]
  1. Rutherford Appleton Lab., Chilton (United Kingdom)
We present a preliminary measurement of R{sub b}, the ratio of {Gamma}(Z{degree} - b{bar b}) relative to {Gamma}(Z{degree} {yields} hadrons) using the silicon CCD-pixel vertex detector of the SLD at the SLAC Linear Collider (SLC). An impact parameter method and a displaced vertex method are applied to all charged tracks, to efficiently tag Z{degree} - b{bar b} events. From the impact (displaced vertex) approach we find R{sub b} = 0.214 {plus_minus} 0.010 {plus_minus} 0.025 (R{sub b} = 0.204 {plus_minus} 0.010 {plus_minus} 0.030), consistent with the standard model value.
Research Organization:
Stanford Linear Accelerator Center, Menlo Park, CA (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AC03-76SF00515; AC03-76SF00098
OSTI ID:
138663
Report Number(s):
SLAC-PUB--5972; LBL--34448; CONF-921122--64; ON: DE93015248
Country of Publication:
United States
Language:
English