Eur. Phys. J. A (2008) 36: 189-194
https://doi.org/10.1140/epja/i2007-10580-5

Regular Article - Theoretical Physics

Hidden charm dynamically generated resonances and the e⁺e^- → J/ψD¯ , J/ψD¯reactions

Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain

^* e-mail: daniel.gamermann@ific.uv.es

Received: 11 December 2007
Accepted: 15 April 2008
Published online: 9 May 2008

Abstract

We analyze two recent reactions of Belle, producing D¯ and D¯^* states that have an enhancement of the invariant D¯ , D¯^* mass distribution above threshold, from the point of view that they might be indicative of the existence of a hidden charm scalar and an axial vector meson state below D¯ or D¯^* thresholds, respectively. We conclude that the data is compatible with the existing prediction of a hidden charm scalar meson with mass around 3700MeV, though other possibilities cannot be discarded. The peak seen in the D¯^* spectrum above threshold is, however, unlikely to be due to a threshold enhancement produced by the presence, below threshold, of the hidden charm axial vector meson X(3872) .