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We use the LHCb data on the forward production of $D$ mesons at 7, 13 and 5TeV to make a direct determination of the gluon distribution, $xg$, at NLO inthe $10^{-5} \lesssim x \lesssim 10^{-4}$ region. We first use a simpleparametrization of the gluon density in each of the four transverse momentumintervals of the detected $D$ mesons. Second, we use a double logparametrization to make a combined fit to all the LHCb $D$ meson data. Thevalues found for $xg$ in the above $x$ domain are of the similar magnitude (ora bit larger) than the central values of extrapolations of the gluons obtainedby the global PDF analyses into this small $x$ region. However, in contrast, wefind $xg$ has a weak dependence on $x$.

Low x gluons determined by open charm production