  STAR's measurements of directed flow ($v_1$) around midrapidity for
$\pi^{\pm}$, K$^{\pm}$, K$_S^0$, $p$ and $\bar{p}$ in Au + Au collisions at
$\sqrtsNN = 200$ GeV are presented. A negative $v_1(y)$ slope is observed for
most of produced particles ($\pi^{\pm}$, K$^{\pm}$, K$_{S}^{0}$ and $\bar{p}$).
In 5-30% central collisions a sizable difference is present between the
$v_1(y)$ slope of protons and antiprotons, with the former being consistent
with zero within errors. The $v_1$ excitation function is presented.
Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton
recombination, and a hydrodynamics model with a tilted source) are made. For
those models which have calculations of $v_1$ for both pions and protons, none
of them can describe $v_1(y)$ for pions and protons simultaneously. The
hydrodynamics model with a tilted source as currently implemented cannot
explain the centrality dependence of the difference between the $v_1(y)$ slopes
of protons and antiprotons.
