Charm-quark fragmentation with an effective coupling constant

Charm-quark fragmentation with an effective coupling constant

We use a recently proposed non-perturbative model, based on an effective strong coupling constant, to study c-flavoured hadron production in e+e− annihilation. Charm-quark production is described in the framework of perturbative fragmentation functions, with NLO coefficient functions, NLL DGLAP evolution and NNLL large-x resummation. We model hadronization effects by means of the effective coup...

Spectroscopy and Charm Quark Fragmentation

The large data sample accumulated at the KEKB storage ring allows for dedicated analysis in charm spectroscopy. This made the first observations of e.g. the broad D∗∗ resonances in B decays as well as other processes possible. The observation of the DsJ(2317) resonances are confirmed and indications of their quantum numbers are given. The fragmentation function for D has been measured with unpr...

Remark on Charm Quark Fragmentation To

The observed D mesons have cq̄ flavor quantum numbers and spin-parity of the light degrees of freedom sl l = 3/2 +. In the mc → ∞ limit the spin of the charm quark is conserved and the c → D fragmentation process is characterized by the probability for the charm quark to fragment to a D meson with a given helicity for the light degrees of freedom. We consider the calculated b → B c fragmentation...

Multi-Loop Results, Charm- and Bottom-Quark Masses and the Strong Coupling Constant

QCD has developed from a qualitative model for strong interactions into a quantitative theory with precise predictions for a multitude of observables. This development, which has taken place in particular during the past two decades, is due to significant improvements in our theoretical understanding, in calculational techniques and in improved experimental results, ranging from low energy stud...

Test of spin dependence in charm-quark fragmentation to D*