Use of W-Boson Longitudinal-Transverse Interference in Top Quark Spin-Correlation Functions

Abstract

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.

Version 4 as to appear in EPJC. Minor editing includes resequencing and renumbering eqs. 117-120