Many matrix elements of hadronic currents can be probed at the CEBAF facility, as well as at DA~NE. The kinematical regions explored axe, however, often different -this makes a concerted effort to measure these processes very attractive.
1. PHYSICS AT CEBAF AND AT DA~NE
Here I discuss a few processes, relevant for chiral perturbation theory (CHPT), that can be measured at CEBAF and at DA~NE. 1
1.1. Electromagnetic form factors of mesons
In Fig. are shown transitions that contain meson matrix elements of the electromagnetic current. At CEBAF (DAffNE) the momentum transfer is spacelike (timelike). I refer to the contribution of Baker for a more detailed discussion of these processes. Here I just mention that the expression for the electric charge radius of the neutral kaon is finite at one loop in CHPT [1], with no low energy constant (LEC) contributing at leading T e e Figure 1. Meson matriz elements of the electromagnetic current (P=lr, K, ~}. The double line stands for the scattered nucleus or nucleon. *Work supported in part by Swiss National Science Foundation 1I do not have at my disposal the contributions from the other speakers, and I apologize to those whose work is therefore not properly referred to in the following.