Spin Issues in t-tbar Production and Decay

Details Spin Issues in t-tbar Production and Decay Spin Issues in t-tbar Production and Decay

1998-11-09

arxiv.org/abs/hep-ph/9811281v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages including 7 embedded figures. Talk presented at the Thinkshop on Top-Quark Physics for Run II, held at the Fermi Natio

Scientific paper

We describe the off-diagonal spin basis for observing angular correlations in top quark pair production events at the Fermilab Tevatron. For events initiated by quark-antiquark annihilation, the top and antitop quark spins are 100% correlated in this basis: a spin-up top quark is always accompanied by a spin-down antitop quark and vice versa. Inclusion of the gluon-gluon initial state lowers the fraction of unlike spin events to 92%. Nevertheless, the angular correlations between the top and antitop quark decay products are twice as large in the off-diagonal basis as those in the more traditional helicity basis. We give two brief examples of how the presence of new physics would alter these correlations.

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