ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The influence of the internal motion of ac−c $$\bar c$$ pair on the fate and on the evolution of this pair is studied by means of a Schrödinger model. The coupling of thec−c $$\bar c$$ internal motion to the inelasticD−c $$\bar D$$ channels is introduced through an imaginary potential. The effect of the change of the surrounding medium in which thec−c $$\bar c$$ pair is travelling is assumed to be incorporated under the form of a time-dependent real potential. The model is studied for the case of ac−c $$\bar c$$ pair leaving a plasma phase for a mixed phase and finally for free space. The time-dependent potential is thus assumed to extrapolate between the Debye-screened potential and the free space charmonium potential in a transition time τ. The influence of the initial wave packet and of the value of the transition time τ is particularly studied. We exhibit the time variation of global properties of the wave packet as well as of its components along the stationary states of the charmonium. We identify more or less two regimes: an expansion regime, which occurs for initially compact wave packets with large kinetic energy, where the wave packet spreads almost freely, and a compression regime, which occurs for broad initial wave packets, where the wave packet is basically compressed by the restoring confining potential. The influence of the imaginary potential is analyzed. TheJ/ψ and ψ′ components are studied. It is shown that the former may be increased in some circumstances and that the latter may remain surprisingly large. The quantum character of these results is underlined.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01554082
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