Decay-lepton angular distribution in polarized $e^+e^- \to \tt$ and $CP$-violating dipole couplings of the top quark

Details Decay-lepton angular distribution in polarized $e^+e^- \to \tt$ and $CP$-violating dipole couplings of the top quark Decay-lepton angular distribution in polarized $e^+e^- \to \tt$ and $CP$-violating dipole couplings of the top quark

1995-09-14

arxiv.org/abs/hep-ph/9509299v2

Phys.Rev. D54 (1996) 4326-4332; Erratum-ibid. D61 (2000) 119901

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, latex, 3 figures will be added soon

Scientific paper

10.1103/PhysRevD.61.119901

In the presence of an electric dipole coupling of $t \bar t$ to a photon, and an analogous ``weak" dipole coupling to the $Z$, $CP$ violation in the process $e^+e^- \rightarrow t \bar t$ leads to the polarization of the top and anti-top. This polarization can be analyzed by studying the energy and angular distributions of a decay charged lepton (anti-lepton) when the top (anti-top) decays leptonically. We have obtained analytic expressions for these distributions when either $t$ or $\overline t$ decays leptonically. We study two types of simple $CP$-violating angular asymmetries which do not need tof simple $CP$-violating angular asymmetries which do not need the full reconstruction of the $t$ or $\bar t$. These together can help to determine the electric and weak dipole form factors independently. We have also shown how the use of longitudinal beam polarization can help to do this with only one asymmetry measurement, and to imprhelp to do this with only one asymmetry measurement, and to improve the sensitivity.

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