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The effects of charmed meson loops on the spectrum of charmonium areconsidered, with special attention paid to the levels above open-charmthreshold. It is found that the coupling to charmed mesons generates astructure at the D \bar{D}* threshold in the 1++ partial wave. The implicationsfor the nature of the X(3872) state are discussed.Comment: 27 pages, 7 EPS figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Coupled-channel model for charmonium levels and an option for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

Coupled-channel model for charmonium levels and an option forX(3872)