Maximizing Spin Correlations in Top Quark Pair Production at the Tevatron

Details Maximizing Spin Correlations in Top Quark Pair Production at the Tevatron Maximizing Spin Correlations in Top Quark Pair Production at the Tevatron

1997-06-09

arxiv.org/abs/hep-ph/9706304v1

Phys.Lett. B411 (1997) 173-179

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, revtex. 4 Postscript figures (included)

Scientific paper

10.1016/S0370-2693(97)00987-8

A comparison is made between the off-diagonal and helicity spin bases for top quark pair production at the FNAL Tevatron. In the off-diagonal basis, 92% of the top quark pairs are in the spin configuration up-down plus down-up, whereas in the helicity basis only 70% are left-right plus right-left. The off-diagonal basis maximizes the spin asymmetry and hence the measured angular correlations between the decay products, which are more than twice as big in this basis as compared to the helicity basis. In addition, for the process q qbar --> t tbar, we give a very simple analytic expression for the matrix element squared which includes all spin correlations between the production and subsequent decay of the top quarks.

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