2009/03/31 by Raphael M. Albuquerque, Mirian E. Bracco, Marina Nielsen · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1016/j.physletb.2009.06.022
7 pages, 4 eps figures
arxiv created 2009/03/31 · arxiv updated 2015/05/13
We use the QCD sum rules to evaluate the mass of a possible scalar mesonic state that couples to a molecular Ds*Ds* current. We find a mass mDs^*Ds^*=(4.14± 0.09) GeV, which is in a excellent agreement with the recently observed Y(4140) charmonium state. We consider the contributions of condensates up to dimension eight, we work at leading order in αs and we keep terms which are linear in the strange quark mass ms. We also consider a molecular D*D* current and we obtain m_D^*D^*=(4.13± 0.10), around 200 MeV above the mass of the Y(3930) charmonium state. We conclude that it is possible to describe the Y(4140) structure as a Ds^*Ds^* molecular state.