https://doi.org/10.1140/epjc/s10052-014-2885-4
Regular Article - Theoretical Physics
Detecting the long-distance structure of the 
1
Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115 , Bonn, Germany
2
Instituto de Física Corpuscular (IFIC), Centro Mixto CSIC-Universidad de Valencia, Institutos de Investigación de Paterna, Aptd. 22085, 46071 , Valencia, Spain
3
Department of Physics, Middle East Technical University, 06531 , Ankara, Turkey
4
Institut de Physique Nucléaire, Université Paris-Sud, IN2P3/CNRS, 91406 , Orsay Cedex, France
* e-mail: fkguo@hiskp.uni-bonn.de
Received:
10
April
2014
Accepted:
30
April
2014
Published online:
20
May
2014
We study the 
decay within a 
molecular picture for the state. This decay mode is more sensitive to the long-distance structure of the resonance than its 
and 
decays, which are mainly controlled by the details of the wave function at short distances. We show that the 
final state interaction can be important, and that a precise measurement of this partial decay width can provide valuable information on the interaction strength between the 
charm mesons.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
