$W^{+}-H^{+}$ Interference and Partial Width Asymmetry in Top and Antitop Decays

Abstract

We re-examine the question of a possible difference in the partial decay widths of $t$ and $\overline{t}$, induced by an intermediate scalar boson $H^{+}$ with $CP$-violating couplings. The interference of $W^{+}$ and $H^{+}$ exchanges is analysed by constructing the $2\times 2$ propagator matrix of the $W^{+}-H^{+}$ system, and determining its absorptive part in terms of fermion loops. Results are obtained for the partial rate difference in the channels $t\to b{l}^{+}{\nu }_l$ and $t\to bc\overline{s}$, which fulfil explicitly the constraints of $CPT$ invariance. These results are contrasted with those in previous work.

14 pages, report PITHA 94/19

References in corpus (3)

• On Gauge Invariance of Breit-Wigner Propagators
• Transverse Tau Polarization in Decays of the Top and Bottom Quarks in the Weinberg Model of CP Non-conservation
• Particle Width Effect on $CP$-Violating Asymmetries

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• Resonant CP violation induced by particle mixing in transition amplitudes
• CP Violation in Top Physics
• Leptogenesis in Theories with Large Extra Dimensions
• Using t -> b \bar{b} c to Search for New Physics