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Use of W-boson longitudinal–transverse interference in top quark spin-correlation functions: II.
- Source :
-
European Physical Journal C -- Particles & Fields . May2006, Vol. 46 Issue 2, p385-402. 18p. 3 Diagrams. - Publication Year :
- 2006
-
Abstract
- This continuation of the derivation of general beam-referenced stage-two spin-correlation functions is for the analysis of top–antitop pair-production at the Tevatron and at the Large Hadron Collider. Both the gluon-production and the quark-production contributions are included for the charged-lepton-plus-jets reaction pp or $p\bar{p}\rightarrow t\bar{t}\rightarrow(W^+b)(W^-\bar{b})\rightarrow(l^+\nu b)(W^-\bar{b})$ . There is a simple 4-angle beam-referenced 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 $t\rightarrow W^+b$ decay mode. There is an analogous function and tests for $\bar{t}\rightarrow W^-\bar{b}$ decay. This signature requires use of the $(t\bar{t})_{\text{c.m.}}$ energy of the hadronically decaying W-boson, or the kinematically equivalent cosine of the polar angle of $W^\mp$ emission in the antitop (top) decay frame. Spinors and their outer-products are constructed so that the helicity-amplitude phase convention of Jacob and Wick can be used throughout for the fixing of the signs associated with this large W-boson longitudinal–transverse interference effect. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14346044
- Volume :
- 46
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- European Physical Journal C -- Particles & Fields
- Publication Type :
- Academic Journal
- Accession number :
- 20535546
- Full Text :
- https://doi.org/10.1140/epjc/s2006-02481-2