Search for a Light NMSSM Higgs Boson at CDF

We present a search for an NMSSM Higgs boson as proposed by Dermisek and Gunion [1]. This model invokes a light Higgs with a mass of order 100~GeV/$c^2$, which decays into two CP-odd Higgs bosons with $m_a < 2m_b$. This CP-odd Higgs is expected to decay principally into two $\tau$ leptons, leaving a four-$\tau$ final state. This decay chain evades the LEP limit of $m_H > 114$~GeV/$c^2$ and is well motivated by the LEP data. \\[4pt] [1] Dermisek, Gunion Phys. Rev. D75, 075019 (2007)