Spin Correlation in tt-bar Production from pp-bar Collisions at sqrt(s)=1.8 TeV

Details Spin Correlation in tt-bar Production from pp-bar Collisions at sqrt(s)=1.8 TeV Spin Correlation in tt-bar Production from pp-bar Collisions at sqrt(s)=1.8 TeV

2000-02-23

arxiv.org/abs/hep-ex/0002058v2

Phys.Rev.Lett.85:256-261,2000

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to PRL, Added references, minor changes to text

Scientific paper

10.1103/PhysRevLett.85.256

The D0 collaboration has performed a study of spin correlation in tt-bar production for the process tt-bar to bb-bar W^+W^-, where the W bosons decay to e-nu or mu-nu. A sample of six events was collected during an exposure of the D0 detector to an integrated luminosity of approximately 125 pb^-1 of sqrt{s}=1.8 TeV pp-bar collisions. The standard model (SM) predicts that the short lifetime of the top quark ensures the transmission of any spin information at production to the tt-bar decay products. The degree of spin correlation is characterized by a correlation coefficient k. We find that k>-0.25 at the 68% confidence level, in agreement with the SM prediction of k=0.88.

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