ar X iv : h ep - p h / 02 05 02 8 v 1 2 M ay 2 00 2 η in the nuclear medium within a chiral unitary approach

ar X iv : h ep - p h / 02 11 28 5 v 1 1 8 N ov 2 00 2 1 η nucleus optical potential in a chiral unitary approach

The self-energy of an η in a nuclear medium is calculated in a chiral unitary model, and applied to η states in nuclei. Our calculation predicts an attractive η nucleus optical potential which can accommodate many η bound states in different nuclei.

ar X iv : h ep - p h / 02 05 07 5 v 1 8 M ay 2 00 2 CP Violation and the Search for New Physics ∗

We present an overview of CP violation in the Standard Model and Beyond, describing various possible sources of CP violation and how to search for them.

ar X iv : h ep - p h / 01 05 03 3 v 1 3 M ay 2 00 1 Threshold η and η ′ electroproduction off nucleons 1

The electroproduction of η and η ′ mesons on the proton and the neutron is investigated at tree level within the framework of U (3) chiral perturbation theory. In addition to the Born terms low-lying resonances such as the vector mesons and J P = 1/2 + , 1/2 − baryon resonances are included explicitly and their contributions are calculated. Results for the separated differential cross sections ...

ar X iv : h ep - p h / 02 05 01 6 v 1 2 M ay 2 00 2 Scalar a 0 ( 980 ) meson in φ → π 0 ηγ decay

ar X iv : h ep - p h / 02 05 07 9 v 1 8 M ay 2 00 2 CONSTRUCTING CONFINEMENT

The interaction between static quarks is derived by applying many-body techniques to QCD in Coulomb gauge. The result is shown to be exact in the IR and UV limits, and agrees remarkably well with lattice computations.