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 → tt̄ is also presented. For the derived analytic results we determine the 1-σ statistical sensitivities to the tCEDM form factor for (i) typical CP-odd observables composed of lepton and anti-lepton momenta from t and t̄ 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 gs cm 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 gs cm on the imaginary part of the tCEDM.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 1997 Dec 4|
Bibliographical noteFunding Information:
The authors would like to thank Prof. H.S. Song and Dr. M.S. Baek for careful reading and useful comments. The work was supported in part by the KOSEF-DFG large collaboration project, Project No. 96-0702-01-01-2. The work of SYC was supported in part by the Korean Science and Engineering Foundation (KOSEF) and Korean Federation of Science and Technology Societies through the Brain Pool program.T he work of CSK and JL was supportedi n part by the CTP, Seoul National University, in part by Yonsei University Faculty ResearchF und of 1997, in part by the BSRI Program, Ministry of Education, Project No. BSRI-97-2425, and in part by Non-Directed-Research-Fundo f 1997. KRF.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics