CP violation and the H-A lineshape
Abstract
In two-Higgs doublet models (and particularly in the MSSM) the CP-even (H) and CP-odd (A) neutral scalars are nearly degenerate in mass, and their s-channel production would lead to nearly overlapping resonances. CP-violating effects may connect these two Higgs bosons, giving origin to one-loop particle mixing, which, due to their mass proximity, can be resonantly enhanced, altering their lineshape significantly. We show that, in general, the effect of such a CP-violating mixing cannot be mimicked by (or be re-absorbed into) a simple redefinition of the H and A masses in the context of a CP-conserving model. Specifically, the effects of the CP-mixing are such that, either the mass-splitting of the H and A bosons lies outside the range allowed by the theory in the absence of CP-mixing, and/or the detailed energy dependence of the produced lineshape is clearly different from the one obtained by redefining the masses, but not allowing any mixing.
Keywords
Cite
@article{arxiv.0711.0935,
title = {CP violation and the H-A lineshape},
author = {J. Bernabeu and D. Binosi and J. Papavassiliou},
journal= {arXiv preprint arXiv:0711.0935},
year = {2008}
}
Comments
3 pages, 1 figure, based on talk given at the 2007 Europhysics Conference on High Energy Physics, Manchester, 19-25 July