Probing CP-violating Higgs contributions in gamma-gamma -> f anti-f through fermion polarization

Details Probing CP-violating Higgs contributions in gamma-gamma -> f anti-f through fermion polarization Probing CP-violating Higgs contributions in gamma-gamma -> f anti-f through fermion polarization

2006-09-12

arxiv.org/abs/hep-ph/0609113v2

Phys.Rev.D74:095006,2006; Erratum-ibid.D74:119901,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 14 figures, typeset in revtex4. Version which has appeared in Physical Review D; typos in two references corrected

Scientific paper

10.1103/PhysRevD.74.095006

We discuss the use of fermion polarization for studying neutral Higgs bosons at a photon collider. To this aim we construct polarization asymmetries which can isolate the contribution of a Higgs boson $\phi$ in $\gamma\gamma\to f \bar f$, $f=\tau/t$, from that of the QED continuum. This can help in getting information on the $\gamma\gamma\phi$ coupling in case $\phi$ is a CP eigenstate. We also construct CP-violating asymmetries which can probe CP mixing in case $\phi$ has indeterminate CP. Furthermore, we take the MSSM with CP violation as an example to demonstrate the potential of these asymmetries in a numerical analysis. We find that these asymmetries are sensitive to the presence of a Higgs boson as well as its CP properties over a wide range of MSSM parameters. In particular, the method suggested can cover the region where a light Higgs boson may have been missed by LEP due to CP violation in the Higgs sector, and may be missed as well at the LHC.

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