  High mobility InSb quantum wells with tunable carrier densities are
investigated by transport experiments in magnetic fields tilted with respect to
the sample normal. We employ the coincidence method and the temperature
dependence of the Shubnikov-de Haas oscillations and find a value for the
effective g-factor of $\mid g^{\ast}\mid $ =35$\pm$4 and a value for the
effective mass of $m^*\approx0.017 m_0$, where $m_0$ is the electron mass in
vacuum. Our measurements are performed in a magnetic field and a density range
where the enhancement mechanism of the effective g-factor can be neglected.
Accordingly, the obtained effective g-factor and the effective mass can be
quantitatively explained in a single particle picture. Additionally, we explore
the magneto-transport up to magnetic fields of 35 T and do not find features
related to the fractional quantum Hall effect.
