T-odd Gluon-Top-Quark Effective Couplings at the CERN Large Hadron Collider
Abstract
The T-odd top-quark chromoelectric dipole moment (tCEDM) is probed through top-quark-pair production via gluon fusion at the CERN Large Hadron Collider (LHC) by considering the possibility of having polarized protons. The complete analytic expressions for the tree-level helicity amplitudes of gg-> ttbar is also presented. For the derived analytic results we determine the 1-sigma statistical sensitivities to the tCEDM form factor for (i) typical CP-odd observables composed of lepton and anti-lepton momenta from t and tbar semileptonic decays for unpolarized protons, and (ii) a CP-odd event asymmetry for polarized protons by using the so-called Berger-Qiu (BQ) parametrization of polarized gluon distribution functions. We find that at the CERN LHC, the CP-odd energy and angular correlations can put a limit of 10^{-18} to 10^{-17} g_scm on the real and imaginary parts of the tCEDM, while the simple CP-odd event asymmetry with polarized protons could put a very strong limit of 10^{-20} g_scm on the imaginary part of the tCEDM.
Keywords
Cite
@article{arxiv.hep-ph/9706379,
title = {T-odd Gluon-Top-Quark Effective Couplings at the CERN Large Hadron Collider},
author = {S. Y. Choi and C. S. Kim and Jake Lee},
journal= {arXiv preprint arXiv:hep-ph/9706379},
year = {2009}
}
Comments
14 pages(LaTeX), 1 Postscript figure(use epsfig.sty)