English

New angles on top quark decay to a charged Higgs

High Energy Physics - Phenomenology 2008-11-26 v1

Abstract

To properly discover a charged Higgs Boson (H±H^\pm) requires its spin and couplings to be determined. We investigate how to utilize \ttbar\ttbar spin correlations to analyze the H±H^\pm couplings in the decay tbH+bτ+ντt\to bH^+\to b\tau^+\nu_\tau. Within the framework of a general Two-Higgs-Doublet Model, we obtain results on the spin analyzing coefficients for this decay and study in detail its spin phenomenology, focusing on the limits of large and small values for tanβ\tan\beta. Using a Monte Carlo approach to simulate full hadron-level events, we evaluate systematically how the H±τ±ντH^\pm\to\tau^\pm\nu_\tau decay mode can be used for spin analysis. The most promising observables are obtained from azimuthal angle correlations in the transverse rest frames of t(tˉ)t(\bar{t}). This method is particularly useful for determining the coupling structure of H±H^\pm in the large tanβ\tan\beta limit, where differences from the SM are most significant.

Keywords

Cite

@article{arxiv.0710.5906,
  title  = {New angles on top quark decay to a charged Higgs},
  author = {David Eriksson and Gunnar Ingelman and Johan Rathsman and Oscar Stål},
  journal= {arXiv preprint arXiv:0710.5906},
  year   = {2008}
}

Comments

28 pages, 13 figures. Uses JHEP format

R2 v1 2026-06-21T09:38:26.924Z