First Measurement of the Ratio sigma_(t-tbar) / sigma_(Z/\gamma->ll) and Precise Extraction of the t-tbar Cross Section

We report a measurement of the ratio of the t{bar t} to Z/{gamma}* production cross sections in {radical}s = 1.96 TeV p{bar p} collisions using data corresponding to an integrated luminosity of up to 4.6 fb{sup -1}, collected by the CDF II detector. The t{bar t} cross section ratio is measured using...

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Bibliographic Details
Published in:Physical review letters 2010-04, Vol.105
Main Authors: Aaltonen, T, /Helsinki Inst. of Phys, Adelman, J, /Chicago U., EFI, Alvarez Gonzalez, B, /Cantabria Inst. of Phys, Amerio, S, /INFN, Padua, Amidei, D, /Michigan U., Anastassov, A, /Northwestern U., Annovi, A, /Frascati, Antos, J, /Comenius U., Apollinari, G, /Fermilab, Apresyan, A, /Purdue U., Arisawa, T, /Waseda U. /Dubna, JINR
Format: Article
Language:English
Subjects:
CROSS SECTIONS
Experiment-HEP
FERMILAB COLLIDER DETECTOR
LUMINOSITY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PRODUCTION
STANDARD MODEL
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Summary:We report a measurement of the ratio of the t{bar t} to Z/{gamma}* production cross sections in {radical}s = 1.96 TeV p{bar p} collisions using data corresponding to an integrated luminosity of up to 4.6 fb{sup -1}, collected by the CDF II detector. The t{bar t} cross section ratio is measured using two complementary methods, a b-jet tagging measurement and a topological approach. By multiplying the ratios by the well-known theoretical Z/{gamma}* {yields} ll cross section predicted by the standard model, the extracted t{bar t} cross sections are effectively insensitive to the uncertainty on luminosity. A best linear unbiased estimate is used to combine both measurements with the result {sigma}{sub t{bar t}} = 7.70 {+-} 0.52 pb, for a top-quark mass of 172.5 GeV/c{sup 2}.
ISSN:0031-9007
1079-7114