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Phys Rev Lett. 2012 Oct 12;109(15):152004. Epub 2012 Oct 9.

Measuring top-quark polarization in top-pair + missing-energy events.

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  • 1High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.


The polarization of a top quark can be sensitive to new physics beyond the standard model. Since the charged lepton from top-quark decay is maximally correlated with the top-quark spin, it is common to measure the polarization from the distribution in the angle between the charged lepton and the top-quark directions. We propose a novel method based on the charged lepton energy fraction and illustrate the method with a detailed simulation of top-quark pairs produced in supersymmetric top squark pair production. We show that the lepton energy ratio distribution that we define is very sensitive to the top-quark polarization but insensitive to the precise measurement of the top-quark energy.

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