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

S. Y. Choi; C. S. Kim; Jake Lee

doi:10.1016/S0370-2693(97)01238-0

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

S. Y. Choi, C. S. Kim, Jake Lee

Department of Physics

Research output: Contribution to journal › Article › peer-review

27 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 g_s 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 g_s cm on the imaginary part of the tCEDM.

Original language	English
Pages (from-to)	67-74
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	415
Issue number	1
DOIs	https://doi.org/10.1016/S0370-2693(97)01238-0
Publication status	Published - 1997 Dec 4

Bibliographical note

Funding 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

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10.1016/S0370-2693(97)01238-0

Cite this

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title = "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 → t{\=t} 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 {\=t} 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.",

author = "Choi, {S. Y.} and Kim, {C. S.} and Jake Lee",

note = "Funding 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.",

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doi = "10.1016/S0370-2693(97)01238-0",

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AU - Choi, S. Y.

AU - Kim, C. S.

AU - Lee, Jake

N1 - Funding 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.

PY - 1997/12/4

Y1 - 1997/12/4

N2 - 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.

AB - 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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ER -

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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