CP asymmetries induced by particle widths: Application to top quark decays
Jul, 199111 pages
Published in:
- Phys.Rev.Lett. 67 (1991) 1979-1981
Report number:
- MAD-PH-664,
- MSU-TH-05,
- BNL-46462
Citations per year
Abstract: (APS)
An on-shell unstable particle produced in a tree-level process, such as W in t→qW, induces a CP violating signal through its width. This effect arises from an Im(tree)×Re(loop) type of interference. Among t→qq’q¯ processes (e.g., t→bcb¯) proceeding either through the tree-level t→qW or the one-loop t→q’+(virtual g) reactions, the CP asymmetry is largest for the case t→dcd¯ and is of scrO(η/λ2) in Wolfenstein’s parametrization. The resulting effects are found to be small in the standard model, but are much larger than those obtained for radiative top-quark decays. We also briefly discuss B decays where such a mechanism may cause CP violation in, for example, b→se+e−.- top
- top: decay modes
- decay modes: quark
- mass: top
- top: mass
- top: branching ratio
- CP: violation
- decay: asymmetry
- asymmetry: decay
- W: width
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