  We formulate the composite fermions in the presence of an in-plane magnetic
field. As the in-plane field increases, if we assume the state at $\nu=5/2$
turns into the mixed state between the unidirectional charge density wave
domains and paired Hall state, we can phenomenologically fit the theoretically
defined gap to the experimental measured results. We explain the destruction of
the paired Hall states and then a phase transition from the paired Hall state
to the unidirectional charge density wave from a symmetry point of view.
