I review the sensitivities achieved by and projected for fixed-target charm experiments in CP violation, flavor-changing neutral-current and lepton-number-violating decays, and mixing, and I describe the Charm2000 experiment intended to run at Fermilab in the Year ≈2000. If approved, Charm2000 will in many of these areas exceed the sensitivities projected for a Tau/Charm Factory, but the Tau/Ch...

There have been great advances in charm physics at the B-factories in recent years, including the observation of D-D 0 mixing and the discovery of many new hidden-charm states, some of them presumably exotic in structure. This talk reviews some of the recent Belle results, with emphasis on the hidden-charm sector. Evidence for two new charged states is presented for the first time at this confe...

The current plans for a high luminosity e+ecollider operated between 3.0 and 4.4 GeV/c2 are described. Such a dedicated facility (The Tau-Charm Factory), operating near tau-pair and charm thresholds would allow studies of the decay of the third generation tau-lepton and the second generation c-quark with unprecedented precision and control of systematics. The charm physics of such a facility is...

The semileptonic decays of charm particles continue to be an important area of research. The branching fractions provide measurements of CKM matrix elements in the charm sector, |Vcq| . All hadronic complications are contained in the form factors, which can be calculated via nonperturbative lattice QCD, Heavy Quark Effective Theories, Quark Models, and other methods. By comparing experimental o...

Open charm production in electron-proton (ep) scattering at the high energies of HERA (centreof-mass energy √ s ∼ 320 GeV) is an ideal tool to study perturbative Quantum Chromodynamics (pQCD), since the charm mass provides a hard scale. The main charm production mechanism is photon-gluon fusion (PGF) where a photon emitted by the incoming electron interacts with a gluon in the proton forming a ...

The charm quark photoproduction at large transverse momentum in the resolved photon interaction via partonic subprocess c(γ)g → cg is studied. It is shown that at HERA energies the contribution of the charm quark excitation in the photon in the inclusive charm production at p⊥ > 5 GeV/c dominates over the other resolved photon contribution via the gluon content of the photon and it is about 30%...

We compute the predictions of intrinsic charm for deep-inelastic scattering at high-Q 2 and compare to HERA data. With the inclusion of constraints from low-energy data, enhancements beyond the predictions of standard structure functions are very modest, but peaking in the leptoquark mass variable is present near 200 GeV. Ultimately, the ability of HERA to probe the intrinsic charm hypothesis c...

The performance of a transaction processing system whose database is not completely memory-resident critically depends on the amount of physical disk I/O required. This paper describes a high-performance transaction processing system called Charm, which aims to reducing the concurrency control overhead by minimizing the performance impacts of disk I/O on lock contention delay. In existing trans...

Because of their large masses, one expects charm mesons to be mostly produced in the initial preequilibrium stage of relativistic heavy ion collisions. They have thus been suggested as possible probes of the initial dynamics in these collisions. Previous studies have been concentrated on the production of charm quarks from the preequilibrium partonic matter [1]. For charm meson production from ...

We address the nonperturbative effects associated with soft charm quarks in inclusive B decays. Such corrections are allowed by the OPE, but have largely escaped attention so far. The related four-quark ‘double heavy’ expectation values of the form 〈B|b̄c c̄b|B〉 are computed in the 1/mc expansion by integrating out the charm field to one and two loops. A significant enhancement of the two-loop co...