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

Abstract

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

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

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Cited by in corpus (15)

• CPsuperH2.0: an Improved Computational Tool for Higgs Phenomenology in the MSSM with Explicit CP Violation
• Top polarisation studies in $H^{-}t$ and $Wt$ production
• Enhanced $thj$ signal at the LHC with $h\to \gamma \gamma$ decay and $\mathcal{C}\mathcal{P}$-violating top-Higgs coupling
• Exploring CP Violation in the MSSM
• Model-independent analysis of Higgs spin and CP properties in the process $e^{+}{e}^{-}\to t\bar{t}\Phi$
• The 125 GeV Higgs signal at the LHC in the CP Violating MSSM
• 125 GeV Higgs Boson signal within the complex NMSSM
• Constraints on CP-violating gauge-Higgs operators
• Using Jet Substructure at the LHC to Search for the Light Higgs Bosons of the CP-Violating MSSM
• Testing Higgs Physics at the Photon Collider
• Comparison of electric dipole moments and the Large Hadron Collider for probing CP violation in triple boson vertices
• Constraining new resonant physics with top spin polarisation information
• Probing Higgs-sector CP Violation at a Photon Collider
• Introduction to Photon 2007
• Supersymmetry and other New Physics at gamma gamma colliders