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Measuring the total charm cross section is important for the comparison totheoretical predictions of the highest precision available for charm today,which are completely known up to NNLO QCD for the total inclusive crosssections. These are also independent of charm fragmentation, while practicalmeasurements of charm hadrons in a fiducial phase space are not. Recently theLHC experiments have reported non-universality of charm fragmentation, whichshows that e.g. charm baryon-to-meson ratios are not universal in differentcollision systems, and that the related production fractions also depend ontransverse momentum. This breaks the charm fragmentation universality that wasassumed until recently for the extrapolation of experimental measurements tothe full total charm cross section phase space. A proposal is made how toaddress this non-universality in a data driven way without the need toimplement any particular non-universal fragmentation model. As a practicalexample, this method is applied to the extrapolation of published LHCmeasurements of $D^0$ production at $\sqrt{s}=5$ TeV to the corresponding totalcharm cross section, which fully accounts for charm fragmentationnon-universality for the first time. The result, $8.43^{+1.05}_{-1.16}(\text{total})$ mb, differs substantially from the one assumingcharm fragmentation universality, but still compares well to theoretical QCDpredictions up to NNLO.

A novel phenomenological approach to total charm cross section measurements at the LHC