Heavy-flavour production in the SACOT-mT scheme

Hannu Paukkunen, Ilkka Helenius
2019 Proceedings of International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardProbes2018)   unpublished
The hadroproduction of heavy-flavoured mesons has recently attracted a growing interest e.g. within the people involved in global analysis of proton and nuclear parton distribution functions, saturation physics, and physics of cosmic rays. In particular, the D-and B-meson measurements of LHCb at forward direction are sensitive to gluon dynamics at small x and are one of the few perturbative small-x probes before the next generation deep-inelastic-scattering experiments. In this talk, we will
more » ... is talk, we will concentrate on the collinear-factorization approach to inclusive D-meson production and describe a novel implementation -SACOT-m T -of the general-mass variable flavour number scheme (GM-VFNS). In the GM-VFNS framework the cross sections retain the full heavyquark mass dependence at p T = 0, but gradually reduce to the ordinary zero-mass results towards asymptotically high p T . However, the region of small (but non-zero) p T has been somewhat problematic in the previous implementations of GM-VFNS, leading to divergent cross sections towards p T → 0, unless the QCD scales are set in a particular way. Here, we provide a solution to this problem. In essence, the idea is to consistently account for the underlying energy-momentum conservation in the presence of a final-state heavy quark-antiquark pair. This automatically leads to a well-behaved GM-VFNS description of the cross sections across all p T without a need to fine tune the QCD scales. The results are compared with the LHCb data and a very good agreement is found. We also compare to fixed-order based calculations and explain why they lead to approximately a factor of two lower D-meson production cross sections than the GM-VFNS approach.
doi:10.22323/1.345.0145 fatcat:o7rfkegup5bd7em3ttv342jlam