We measure the ratio of the efficiencies to identify a bottom quark jet with 
the SecVtx algorithm in data and Monte Carlo. This scale factor (SF) 
measurement uses a double-tag technique similar to the innovative technique 
developed in CDF6291, but affords lower systematic errors by directly 
measuring (SF) rather than the SecVtx efficiency. The systematic uncertainty 
is dominated by the the MC statistics because the method eliminates the 
systematic uncertainty due to the heavy avor measurement of the sample. 
With more MC statistics this method should yield a lower systematic 
uncertainty than previous SF measurements in Run II. The result is 
(SF) = 0.811 +/- 0.024 (stat) +/- 0.058 (syst).

Posted to /cdf/pub/cdf6912_AlterSecVtxSF_W2004.pdf
    http://www-cdf.fnal.gov/cdfnotes/cdf6912_AlterSecVtxSF_W2004.pdf
(This is revision # 1.)

Posted by dsherman@cdfsga