First Measurement of the Ratio sigma t-tbar - sigma Z-γ*->ll and Precise Extraction of the t-tbar Cross Section - High Energy Physics - ExperimentReportar como inadecuado




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Abstract: We report a measurement of the ratio of the top-antitop to Z-gamma*production cross sections in sqrts = 1.96 TeV proton-antiproton collisionsusing data corresponding to an integrated luminosity of up to 4.6 fb-1,collected by the CDF II detector. The top-antitop cross section ratio ismeasured using two complementary methods, a b-jet tagging measurement and atopological approach. By multiplying the ratios by the well-known theoreticalZ-gamma*->ll cross section, the extracted top-antitop cross sections areeffectively insensitive to the uncertainty on luminosity. A best linearunbiased estimate is used to combine both measurements with the resultsigma top-antitop = 7.70 +- 0.52 pb, for a top-quark mass of 172.5 GeV-c^2.



Autor: CDF Collaboration, T. Aaltonen, et al.

Fuente: https://arxiv.org/







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