Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-06-23
Eur.Phys.J.C45:121-138,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version 4 as to appear in EPJC. Minor editing includes resequencing and renumbering eqs. 117-120
Scientific paper
10.1140/epjc/s2005-02409-4
Most of this paper consists of the derivation of general beam-referenced stage-two spin-correlation functions for the analysis of top-antitop pair-production at the Tevatron, at the Large Hadron Collider, and/or at an International Linear Collider. However, for the charged-lepton-plus-jets reaction $q \bar{q} \to t \bar{t} \to (W^+ b) (W^- \bar{b}) \to (l^{+} \nu b) (W^- \bar{b})$, there is a simple 3-angle spin-correlation function for determination of the relative sign of, or for measurement of a possible non-trivial phase between the two dominant $\lambda_b = -1/2 $ helicity amplitudes for the $t\to W^{+}b$ decay mode. For the CP-conjugate case, there is an analogous function and tests for $\bar{t} \to W^{-} \bar{b}$ decay. These results make use of W-boson longitudinal-transverse interference.
Barbagiovanni Eric Gasparo
Berger Jeffrey J.
Nelson Charles A.
Pueschel Elisa K.
Wickman Joshua R.
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