We propose that the charged-particle multiplicity dependence of charm-baryon-to-meson ratio observed in high-energy $pp$ collisions can be explained by canonical treatment quantum charges statistical hadronization model (SHM). Taking full particle listings PDG complemented additional charm-baryon states from relativistic quark predictions, we evaluate partition function and charm-hadron chemica...

In the low energy domain, Chiral Perturbation Theory parametrizes the small chiral symmetry breaking effects, produced by the quark masses mu, md and ms, in terms of order parameters of massless QCD. The latter can then, in principle, be measured in high precision, low energy experiments. We discuss several relevant processes and possible improvements at future high luminosity tau/charm or K fa...

It is suggested that the recent anomalous data on Cabibbo-suppressed charm decays can be interpreted as a manifestation of a charged Higgs boson. If this were true, it would be the first experimental detection of a Higgs contribution. At the least, it demonstrates that large, interesting Higgs (i.e., scalar) contributions are consistent with present experimental constraints. Predictions are giv...

The case for further dedicated studies of charm dynamics is presented as driven by three complementary motivations: core lessons on QCD and nonperturbative dynamics in general can be learnt; those can be applied with great profit in analyses of B decays; charm decays offer a novel portal to New Physics in particular through CP studies.

New high statistics, high resolution fixed target experiments producing 10 10 fully reconstructed charm particles are allowing a detailed study of the charm sector. Recent results on charm quark production from Fermilab fixed target experiments E-791, SELEX and FOCUS are presented. INTRODUCTION This review contains recent results from three Fermilab fixed target experiments dedicated to study c...

Recent results on charm and beauty photoproduction at HERA are discussed. The perturbative QCD calculations are generally smaller than the measured cross sections, particularly in the forward (proton) direction. The study of charm dijet photoproduction is consistent with a significant contribution of charm excitation processes.

Recent experimental measurements on open charm production in proton-proton, proton (deuteron)-nucleus and nucleus-nucleus collisions at RHIC are reviewed. A comparison with theoretical predictions is made. Some unsettled issues in open charm production call for precise measurements on directly reconstructed open charm hadrons.

Charm production from the quark-gluon plasma created in the midrapidity of central heavy ion collisions at the Large Hadron Collider (LHC) is studied in the next-to-leading order in QCD. Using a schematic longitudinally boost-invariant and transversally expanding fire-cylinder model, we find that charm production could be appreciably enhanced at LHC as a result of the high temperature that is e...

The prospects to test the hypothesis of intrinsic charm quarks in the proton are investigated. We consider how this component can be directly or indirectly probed in deep inelastic scattering at HERA and in fixed target experiments and find that an overlooked signal might be present in existing NMC data. Applying the intrinsic charm model to hadron collisions we compare the resulting charm prod...