We explore the possibility that the excess neutral and charged current events seen by the H1 and ZEUS Collaborations at HERA at large x and Q2 could arise from a hard charm component of the nucleon. While the symmetric intrinsic charm hypothesis is unable to account for the HERA anomaly, a non-symmetric charm distribution generated non-perturbatively, for which c is much harder than c, can prod...

The existence of baryons with two and three charm quarks is expected from our present understanding of hadronic structure. In the doublecharm system one expects a J=1/2 ground state iso-doublet, termed Ξ cc in PDG notation [1]. Most predictions for the masses of the J=1/2 states and the J=3/2 hyperfine excitations expect the ground state near 3.6 GeV/c and a hyperfine split of 60 MeV/c [2]. The...

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics. and pave the way for understanding physics beyond the Standard Mod...

Recent results on open charm production at HERA are presented. Charm quarks are identified via the reconstruction of D-mesons. The charm contribution to the proton structure function is shown. Evidence for an exotic anti-charmed baryon state observed by H1 is presented. The data show a narrow resonance in the Dp invariant mass combination at 3099±3stat±5syst MeV. The resonance is interpreted as...