[en] Using a bar D meson cloud model we calculate the squared charm radius of the nucleon. The ratio between this squared radius and the ordinary baryon squared radius is identified with the probability of open-quote open-quote seeing close-quote close-quote the intrinsic charm component of the nucleon. Our estimate is compatible with those used to successfully describe the charm production phenomenology. However, because of the lack of relevant experimental information, a large uncertainty in our result is unavoidable. copyright 1996 The American Physical Society

[en] In this talk we will review current results concerning bottom and charm physics from Fermilab Fixed Target experiments E672/E706, E769, E771, E781 (SELEX), E789, D791, E831 (FOCUS). Both production and decay physics will be reviewed. Results from Charmonium production will be presented in another talk at this conference

[en] Based on a dataset acquired by the BABAR experiment running on and near the Υ(4S) resonance from 1999-2002, an upper limit is set on the rate of D⁰-(bar D)⁰ mixing using the decay mode D*⁺ → D⁰π⁺, followed by a semi-leptonic decay of the D⁰. Results are compared to previous BABAR analysis using hadronic decays. We also set limits on the flavor-changing neutral current decays D⁰ → e⁺e^- (μ⁺μ^-) and the lepton-flavor violation decays D⁰ → e^±μ^±

[en] Five different methods for searches of mixing and CP violation in the D0 - D(bar sign)0 system are presented and different experimental result are shown. The results are consistent with no mixing and no CP violation

[en] We discuss the impact of matter effects in the D⁰-ovr D⁰ system. We show that such effects could, in principle, be measured, but that they cannot be used to probe the mass difference x_D or the lifetime difference y_D. This occurs because the mixing effects and the matter effects decouple at short times. We also comment briefly on the B systems

[en] It is pointed out that the internal structure of the narrow resonance X(3872) at the D⁰D-bar*⁰ threshold can be studied in some detail by measuring the rate and the spectra in the decays X(3872)→D⁰D-bar⁰π⁰ and X(3872)→D⁰D-bar⁰γ. In particular, if this resonance contains a dominant 'molecular' component DD*-bar±D-barD*, this component can be revealed and studied by a distinct pattern of interference between the underlying decays of D*⁰ and D-bar*⁰ whose coherence is ensured by fixed (but yet unknown) C parity of the X(3872)

[en] We discuss the impact of matter effects in the D⁰ - bar D⁰ system. We show that such effects could, in principle, be measured, but that they cannot be used to probe the mass difference x_D or the lifetime difference y_D. This occurs because the mixing effects and the matter effects decouple at short times. We also comment briefly on the B systems

[en] Recent measurements of D⁰-D-bar⁰ mixing parameters and measurements searching for CP violation in D⁰ decays are presented.

[en] In order to understand the structure of the X(3872) the effects of the cc¯ charmonium core state coupling to the D⁰D-bar^*0 and D⁺D^*- molecule states are studied. The obtained structure of the X(3872) is about 9 % of cc¯ charmonium, 75 % of the isoscalar DD-bar molecule and 16 % of the isovector DD-bar molecule which explains observed properties of the X(3872) well. (author)

[en] If the true values of the D⁰--Anti-D⁰ mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y approximately > 0.01, and large SU(3) breaking effects in strong phases, delta approximately > pi/4. These constraints are model independent, and would become stronger if vert_barM₁₂/Gamma₁₂vert_bar << 1 in the D⁰--Anti-D⁰ system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D⁰/Anti-D⁰ production symmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of delta might help explain why y approximately sin²Theta_c