T-odd gluon-top-quark effective couplings at the CERN large hadron collider

S. Y. Choi, Choong Sun Kim, Jake Lee

Research output: Contribution to journalArticle

25 Citations (Scopus)

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 → 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.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume415
Issue number1
DOIs
Publication statusPublished - 1997 Dec 4

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quarks
dipole moments
protons
leptons
asymmetry
pair production
angular correlation
form factors
fusion
distribution functions
momentum
sensitivity
decay
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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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 → 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.",
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T-odd gluon-top-quark effective couplings at the CERN large hadron collider. / Choi, S. Y.; Kim, Choong Sun; Lee, Jake.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 415, No. 1, 04.12.1997, p. 67-74.

Research output: Contribution to journalArticle

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