Sub-threshold charm production in nuclear collisions

Charm Production in Ep-collisions

Recent results on the production of open charm in electron proton scattering at HERA are reviewed. Results on the fragmentation of charm are presented and compared to the measurements at e + e − colliders. Recent results on the charm contribution to the proton structure function F2 are shown. Furthermore, measurements of inclusive D * meson, D * + jet and D * + muon production are presented. Th...

Nuclear Effects in Charm Production

I briefly review our understanding of the nuclear target dependence of charm and charmonium production, in view of charm physics at Elfe. Charm as a probe of hard interactions The charm quark mass mc ≃ 1.5GeV = ( 1 7 fm) is large compared to the QCD confinement scale of ΛQCD ≃ .2GeV = 1 fm . Hence charm physics is ‘hard’ physics, as evidenced already by the very narrow total width (86 keV) of t...

SyStematics of Charm Production in Hadronic Collisions

Charm Production in Nn and Γn Collisions

The processes of open and hidden charm production in NN collisions and of open charm production in γN collisions are studied. The near-threshold cross section is predicted and polarization phenomena are calculated in frame of an effective Lagrangian approach.

charm production in relativistic nucleus - nucleus collisions ∗

We calculate excitation functions for open charm mesons in Au + Au reactions from AGS to RHIC energies within the HSD transport approach which is based on string, quark, diquark (q, ¯ q, qq, ¯ q ¯ q) and hadronic degrees of freedom. The open charm cross sections from pN and πN reactions are fitted to results from PYTHIA and scaled in magnitude to the available experimental data. From our dynami...