F. O. Durães

VIRTUAL MESON CLOUD OF THE NUCLEON AND INTRINSIC STRANGENESS AND CHARM

We have used the Meson Cloud Model (MCM) to calculate the charm and strange antiquark distribution in the nucleon. The resulting curve, in the case of charm, is very similar to the intrinsic charm momentum distribution. This allows us to identify the intrinsic quark distribution with the valence quark distribution in the cloud and, at the same time, explains why other MCM calculations fail in reproducing the low x region data. From the intrinsic strange quark distribution in the nucleon, we have extracted information about the relative importance of various intermediate states that should be considered in a loop calculation.

Progress in the determination of the J / psi pi cross-section

Improving previous calculations, we compute the

How hard are the form-factors in hadronic vertices with heavy mesons?

J/\psi \pi\to {charmed mesons}

Does the D/D+ Production Asymmetry Decrease at Large xF?

cross section using QCD sum rules. Our sum rules for the

Meson Cloud and SU(3) Symmetry Breaking in Parton Distributions

J/\psi \pi\to \bar{D} D^*

The Interacting Gluon Model: a review

,

Gluon saturation and the Froissart bound: A Simple approach

D \bar{D}^*

Meson Loops and the gD ∗ Dπ Coupling

,

Testing the meson cloud model in inclusive meson production

{\bar D}^* D^*

Contribution from Drell-Yan processes to the emission spectrum in solar flares

and