CP violation in top-quark pair production at a Next Linear Collider

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.6835· OSTI ID:553153

Baek, M S; Choi, S Y; Kim, C S ^[1]

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1. Department of Physics, Yonsei University, Seoul 120-749 (Korea)

We provide a detailed, model-independent study for CP-violation effects due to the T-odd top-quark electric dipole moment (EDM) and weak dipole moment (WDM) in top-quark pair production via e{sup +}e{sup {minus}} and two-photon annihilation at a Next e{sup +}e{sup {minus}} Linear Collider (NLC). There are two methods in detecting CP-violation effects in these processes. One method makes use of measurements of various spin correlations in the final decay products of the produced top-quark pair, while the other is to measure various CP-odd polarization asymmetry effects of the initial states. In the e{sup +}e{sup {minus}} case only the first method can be used and in the {gamma}{gamma} case both methods can be employed. We provide a complete classification of angular correlations of the t and {bar t} decay products under CP and CP{tilde T}, which greatly faciliate CP tests in the e{sup +}e{sup {minus}} mode. Concentrating on the second method with the Compton backscattered high-energetic laser light off the electron or positron beam in the two-photon mode, we construct two CP-odd and CP{tilde T}-even initial polarization configurations and apply them to investigating CP-violating effects due to the top-quark EDM. With a typical set of experimental parameters at the NLC, we compare the 1{sigma} sensitivities to the top-quark EDM and WDM in the e{sup +}e{sup {minus}} mode and the two-photon mode. Some model expectation values of the T-odd parameters are compared with the results. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 553153
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR CORRELATION
CP INVARIANCE
CPT THEOREM
ELECTRIC DIPOLE MOMENTS
ELECTRON-POSITRON INTERACTIONS
LINEAR COLLIDERS
PAIR PRODUCTION
PHOTON-PHOTON INTERACTIONS
POLARIZATION
T QUARKS
VIOLATIONS