Using the nonperturbative Schwinger-Dyson equation, we show that chiral symmetry in weak-coupling massless QED is dynamically broken by a constant but arbitrarily strong external magnetic field.

In the aspon model solution of the strong CP problem, there is a gauged U (1) symmetry, spontaneously broken by the same vacuum expectation value which breaks CP , whose massive gauge boson provides an additional mechanism of weak CP violation. We calculate the CP asymmetries in B decays for the aspon model and show that they are typically smaller than those predicted from the standard model. A linear relation between the CP asymmetries of different decay processes is obtained.Typeset using REVT E X 1