  We take into account a generic form of a Dirac fermionic dark matter (DM),
which communicates with the Standard Model quarks via a scalar mediator, in a
model-independent way. Four special interaction scenarios are investigated,
where one is parity conserving and the other three are parity violating. Three
of them result in the $v$ suppressed DM-nucleon cross sections, where $v \sim
10^{-3} c$ is the velocity of the DM in the laboratory frame. We constrain the
masses of the dark matter and mediator as well as the couplings from the
thermal relic abundance, and the recent results of the XENON100 direct
detection and collider experiments involving the two channels: (i) monojet plus
large missing transverse energy, and (ii) dijet. The current monojet constraint
is not stronger than that from the requirement of the correct relic density and
the null result by the XENON100 direct detection. We find that the dijet
resonance measurements can exclude a large part of the parameter space
$(m_\chi, m_Y)$, where the couplings for the mediator coupled to the dark
matter and to the quarks are small and have roughly the same magnitude. The
constraint from indirect detections and diphoton resonance searches is also
briefly discussed.
