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CP-violating Higgs; polarization; photon collider.

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 𝜙 in $\gamma \gamma \rightarrow f\bar{f}$, $f = \tau/t$, from that of the QED continuum. This can help in getting information on the $\gamma \gamma \phi$ coupling in case 𝜙 is a CP eigenstate. We also construct CP-violating asymmetries which can probe CP mixing in case 𝜙 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.

Rohini M Godbole¹ Sabine Kraml² Saurabh D Rindani³ Ritesh K Singh⁴

1. Center for High Energy Physics, Indian Institute of Science, Bangalore 560 012, India
2. Theory Division, Department of Physics, CERN, Switzerland
3. Physical Research Laboratory, Ahmedabad 380 009, India
4. Laboratoire de Physique Théoretique, 91405 Orsay Cedex, France

Published

November 2007