  Transverse momentum spectra of $\pi^{\pm}$, $p$ and $\bar{p}$ up to 12 GeV/c
at mid-rapidity in centrality selected Au+Au collisions at $\sqrt{s_{_{NN}}} =
200$ GeV are presented. In central Au+Au collisions, both $\pi^{\pm}$ and
$p(\bar{p})$ show significant suppression with respect to binary scaling at
$p_T > $ 4 GeV/c. Protons and anti-protons are less suppressed than
$\pi^{\pm}$, in the range 1.5 $< p_{T} <$6 GeV/c. The $\pi^-/\pi^+$ and
$\bar{p}/p$ ratios show at most a weak $p_T$ dependence and no significant
centrality dependence. The $p/\pi$ ratios in central Au+Au collisions approach
the values in p+p and d+Au collisions at $p_T >$ 5 GeV/c. The results at high
$p_T$ indicate that the partonic sources of $\pi^{\pm}$, $p$ and $\bar{p}$ have
similar energy loss when traversing the nuclear medium.
