Specific features of heavy quark production: local parton-hadron duality approach to heavy particle spectra

Perturbative QCD formula for inclusive energy spectra of heavy quarks from heavy quark initiated jets which takes into account collinear and/or soft logarithms in all orders, the exact first order result and two-loop effects is applied to distributions of heavy flavoured hadrons in the framework of the LPHD concept. Fits to experimentally measured charm and bottom mean energy losses result in \alpha_{\MSbar}(M_Z)=0.125\pm 0.003\pm 0.004 and (2\GeV)^{-1}\int_0^{2\GeV} dk \alpha_s^{eff}(k)= 0.18\pm 0.01\pm 0.02 with \alpha_s^{eff} an infrared finite effective QCD coupling.