Resonances from Higher Order S-Matrix Poles with Exponential Decay

Abstract

In analogy to Gamow vectors describing resonance states from first order S-matrix poles, one can define Gamow vectors from higher order poles of the S-matrix. With these vectors we are going to discuss a density operator that describes exponentially decaying resonances from higher order poles.

4 pages, no figures, uses group21.sty (included); to appear in GROUP21 proceedings vol. 1, H.-D. Doebner et al., eds., World Scientific, Singapore