CDF Wbb and  W+1,2jet CROSS SECTION RESULTS IN LEPTON + JETS SAMPLE

Authors D. Gerdes, J.S. Miller, M. Soderberg (Univ. of Michigan) Acknowledgments T. Wright for help in understanding systematics and much good advice R. Erbacher and J. Nielsen as conveners of the CDF Top Lepton+Jets Working Group

Description

We have measured the ratio of the "observed" cross-sections of Wbb and W+1,2 jets in the leptons+jets data sample at CDF.  We measure the b-fraction of displaced-vertex jets by fitting the vertex mass distribution of these jets.  We then use the measured b-fraction to calculate the Wbb contribution to our sample.  We finally divide by the total number of W+1,2 jet events in the data.  We do not correct for any detector effects, which is why we consider this a ratio of "observed" cross-sections.

Spring 2005 "Observed" Cross-Section Ratio Results, Using 318 pb-1
Wbb/W+1,2 "observed" cross-section ratio result : 0.0072±0.0024(stat.)±0.0022(syst.) Table of systematic uncertainties, .pdf

Templates of vertex mass for SECVTX tagged jet originating from diferent flavors of quarks. .pdf .eps	Fit of vertex mass of tagged jets in 1 and 2 jet bins of signal data, using a non-b model of charm quark jets and light-flavor quark jets. .pdf .eps

Fit of vertex mass of tagged jets in 1 and 2 jet bins of non-isolated Electron data, using a non-b model of charm quark jets and light-flavor quark jets. .pdf .eps	Fit of vertex mass in double-tagged dijet data, showing vertex of jet with identified muon from semileptonic b-decay. .pdf .eps