  Using a 50-nm width, ultra-clean GaAs/AlGaAs quantum well, we have studied
the Landau level filling factor $\nu = 5/2$ fractional quantum Hall effect in a
perpendicular magnetic field $B \sim$ 1.7 T and determined its dependence on
tilted magnetic fields. Contrary to all previous results, the 5/2 resistance
minimum and the Hall plateau are found to strengthen continuously under an
increasing tilt angle $0 < \theta < 25^\circ$ (corresponding to an in-plane
magnetic field 0 $<$ $B_\parallel$ $< 0.8$ T). In the same range of $\theta$
the activation gaps of both the 7/3 and the 8/3 states are found to increase
with tilt. The 5/2 state transforms into a compressible Fermi liquid upon tilt
angle $\theta > 60^\circ$, and the composite fermion series [2+$p/(2p\pm1)$],
$p =$ 1, 2 can be identified. Based on our results, we discuss the relevance of
a Skyrmion spin texture at $\nu = 5/2$ associated with small Zeeman energy in
wide quantum wells, as proposed by W$\acute{\text o}$js $et$ $al$., Phys. Rev.
Lett. 104, 086801 (2010).
