Low x gluons determined by open charm production

Abstract

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

8 pages, 5 figures, revised figs. and tables, text amended

References in corpus (4)

• New parton distribution functions from a global analysis of quantum chromodynamics
• Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x
• Precision determination of the small-$x$ gluon from charm production at LHCb
• Gluon PDF constraints from the ratio of forward heavy quark production at the LHC at \sqrt{S}=7 and 13 TeV

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