  We investigate normal state properties of spin-orbit coupled Fermi gases with
repulsive s-wave interaction, in the absence of molecule formation, i.e., in
the so-called "upper branch". Within the framework of random phase
approximation, we derive analytical expressions for the quasi-particle lifetime
$\tau_s$, the effective mass $m_s^*$, and the Green's function renormalization
factor $Z_s$ in the presence of Rashba spin-orbit coupling. In contrast to
spin-orbit coupled electron gas with Coulomb interaction, we show that the
modifications are dependent on the Rashba band index s, and occur in the first
order of the spin-orbit coupling strength. We also calculate experimental
observable such as spectral weight, density of state and specific heat, which
exhibit significant differences from their counterparts without spin-orbit
coupling. We expect our microscopic calculations of these Fermi liquid
parameters would have the immediate applications to the spin-orbit coupled
Fermi gases in the upper branch of the energy spectrum.
