Maximizing spin correlations in top quark pair production at the Tevatron

Gregory Mahlon, Stephen Parke

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

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 qq̄ → tt̄, 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.

Original languageEnglish (US)
Pages (from-to)173-179
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume411
Issue number1-2
DOIs
StatePublished - Oct 9 1997

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pair production
quarks
decay
angular correlation
asymmetry
products
matrices
configurations

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "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 qq̄ → tt̄, 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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Maximizing spin correlations in top quark pair production at the Tevatron. / Mahlon, Gregory; Parke, Stephen.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 411, No. 1-2, 09.10.1997, p. 173-179.

Research output: Contribution to journalArticle

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AU - Parke, Stephen

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