- th / 9 80 50 04 v 1 3 M ay 1 99 8 On the determination of the pion effective mass in nuclei from pionic atoms

- th / 9 80 50 28 v 1 1 5 M ay 1 99 8 The Coulomb Interaction between Pion - Wavepackets : The π + – π − Puzzle

l - th / 9 80 30 09 v 2 2 7 M ay 1 99 8 Coherent Photoproduction of Pions on Spin - Zero Nuclei in a relativistic , non - local Model ∗ †

A relativistic and non-local model for the coherent photoproduction of pions on spin-zero nuclei is presented. The production operator is derived from an effective Lagrangian model that contains all the degrees of freedom known to contribute to the elementary process. Using the framework of DWIA, the matrix elements of this operator are evaluated using relativistic bound state wave functions. F...

ar X iv : n uc l - th / 0 10 90 13 v 1 5 S ep 2 00 1 Deeply bound pionic atoms from the ( γ , p ) reaction in nuclei

We study the (γ, p) reaction on 208Pb leading to 207Pb with a bound pion attached to it in the lowest 1s or 2p pionic levels. The reaction can be made recoilless which optimizes the production cross section. The cross sections obtained are easily measurable and can be larger than 50 per cent of the background from all other reactions where pions are not produced. This makes it a clear case for ...

ar X iv : n uc l - th / 9 90 50 50 v 1 2 1 M ay 1 99 9 GAMMA - DEUTERON SCATTERING

We discuss a recent computation of Compton scattering on the deuteron at photon energies of order the pion mass. An interaction kernel is computed in baryon chiral perturbation theory and sewn to phenomenological deuteron wave functions. As an appetizer, we consider a computation of the pion-deuteron scattering length using this method.

ar X iv : h ep - p h / 99 05 54 3 v 1 2 9 M ay 1 99 9 Effective Field Theory Approach to Pionium

The various dynamical scales below the pion mass involved in π + π − atoms are sequentially integrated out using non-relativistic effective field theory techniques. This allows us to systematically organise the corrections to the energy levels and decay width. We present our results in terms of a single unknown constant which may be obtained by matching to the Chiral Lagrangian with electromagn...