  The CP-violating MSSM allows existence of a light neutral Higgs boson
($M_{H_1} \lapp 50$ GeV) in the CPX scenario in the low $\tan \beta (\lapp 5)$
region, which could have escaped the LEP searches due to a strongly suppressed
$H_1 Z Z$ coupling. This parameter space corresponds to a relatively light
$H^\pm$ ($M_{H^\pm} < M_t$), which is predicted to decay dominantly into the $W
H_1$ channel. Thus one expects to see a striking $t \bar t$ signal at the LHC,
where one of the top quarks decays into the $bb \bar b W$ channel, via $t \to b
H^\pm, H^\pm \to W H_1$ and $H_1 \to b \bar b$. The characteristic correlation
between the $b \bar b$, $b \bar b W$ and $b b \bar b W$ invariant mass peaks is
expected to make this signal practically free of the SM background. Our parton
level Monte Carlo simulation yields upto 5000 events, for ${\cal L} = 30$
fb$^{-1}$, over the parameter space of interest, after taking into account the
b-tagging efficiency for three or more b-tagged jets.

High Energy Physics - Phenomenology