  Measurements of the longitudinal double-spin asymmetry, $A_{LL}$, by the STAR
experiment have contributed significantly to our understanding of the gluon
helicity distribution, $\Delta g(x)$, inside the proton. Results from the 2009
inclusive jet measurement, when included into global analyses, indicated a
substantially positive polarization for gluons with partonic momentum fraction
$x$ greater than 0.05. In addition to the inclusive jets, analyses of dijet
production extending to higher pseudorapidity (up to $\eta \sim 1.8$) provide
better constraints on the $x$ dependent behavior of $\Delta g(x)$. Recently,
STAR published several new results at midrapidity (up to $\eta \sim 1.0$) using
the $p+p$ data collected in 2012, 2013 and 2015 at both $\sqrt{s}$ = 510 and
200 GeV. These new results confirm the previous findings and provide additional
constraints in the largely unexplored region of $x < 0.05$. In this talk, the
preliminary results of the $A_{LL}$ for dijet production at intermediate
pseudorapidity (up to $\eta \sim 1.8$) based on 2015 data at $\sqrt{s}$ = 200
GeV, with twice the figure-of-merit of the 2009 data, will be presented. The
comparison with the theoretical expectations as well as its potential impact on
$\Delta g(x)$ will be discussed.
