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D^{±}D^{*∓} Hadronic Atom as a Key to Revealing the X(3872) Mystery
Zhen-Hua Zhang1, Feng-Kun Guo1
1CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Abstract:
The X(3872), whose mass coincides with the D^{0}D[over ¯]^{*0} threshold, is the most extended hadron object. Since its discovery in 2003, debates have never stopped regarding its internal structure. We propose a new object, the X atom, which is the D^{±}D^{*∓} composite system with positive charge parity and a mass of (3879.89±0.07) MeV, formed mainly due to the Coulomb force. We show that a null signal of the X atom can be used to put a lower limit on the binding energy of the X(3872). From the current knowledge of the X(3872) properties, the production rate for the X atom relative to the X(3872) in B decays and at hadron colliders should be at least 1×10^{-3}. New insights into the X(3872) will be obtained through studying the X atom.
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