Speaker
Description
We consider unfavoured light quark/antiquark to D meson fragmentation. We discuss nonperturbative effects for small transverse momenta. The asymmetry for D+ and D- production measured by the LHCb collaboration provides natural constraints on the parton (quark/antiquark) fragmentation functions. We find that already a fraction of fragmentation probability is sufficient to account for the measured asymmetry. Large D-meson production asymmetries are found for large xF which is related to dominance of light quark/antiquark fragmentation over the standard c → D fragmentation. As a consequence, prompt atmospheric neutrino flux at high neutrino energies can be much larger than for the conventional c → D fragmentation. The latter can constitute a sizeable background for the cosmic neutrinos claimed to be observed recently by the IceCube Observatory.
- R. Maciula and A. Szczurek, "D meson production asymmetry, unfavored fragmentation, and consequences for prompt atmospheric neutrino production,"
Phys. Rev. D97, no. 7, 074001 (2018) - V.P. Goncalves, R. Maciula and A. Szczurek,"From $D_{s}^{\pm}$ production asymmetry at the LHC to prompt $\nu_{\tau}$ at IceCube,"
arXiv:1809.05424 [hep-ph]
