2 1 Ju l 2 00 4 Dynamics of the Pionium with the Density Matrix
نویسندگان
چکیده
The evolution of pionium, the π + π − hydrogen-like atom while passing through mater is solved within the density matrix formalism in the first Born approximation. We compare the influence on the pionium lifetime between the standard break-up probability calculations and the more precise picture of the density matrix formalism accounting for interference effects. We focus our general result in the particular conditions of the DIRAC experiment at CERN.
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