Particle Width Effect on $CP$-Violating Asymmetries

Details Particle Width Effect on $CP$-Violating Asymmetries Particle Width Effect on $CP$-Violating Asymmetries

1992-09-29

arxiv.org/abs/hep-ph/9209294v1

Phys.Rev.D47:1741-1743,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

10.1103/PhysRevD.47.R1741

$CP$-violating asymmetries calculated from the Breit-Wigner approximation for unstable particle propagators violate $CPT$. A formalism satisfying $CP$ invariance and unitarity is presented. Applications are given to $t$ decays. For the decay $t\to b\nu_{\tau}\bar{\tau}$ in a class of $CP$-violating models the $CP$-violating asymmetry turns out to be $10^{-4}$ times smaller than the previously reported results.

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