2008/04/30 by R.M. Albuquerque, R. M. Albuquerque, M. Nielsen
Mathematics · Physics and Astronomy · #High-Energy Particle Collisions Research #Mass spectrum #Mathematics #Meson #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #State (computer science) #Tetraquark #hep-ph
paper · pdf · doi:10.1016/j.nuclphysa.2008.10.015
published as Nucl.Phys.A815:53-66,2009; Erratum-ibid.A857:48-49,2011 · 10 pages, 9 figures
arxiv created 2008/04/30 · openalex publication_date 2008/11/09 · arxiv updated 2011/04/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We use QCD sum rules to test the nature of the recently observed mesons Y(4260), Y(4350) and Y(4660), assumed to be exotic four-quark (ccqq) or (ccss) states with JPC=1--. We work at leading order in αs, consider the contributions of higher dimension condensates and keep terms which are linear in the strange quark mass ms. We find for the (ccss) state a mass mY=(4.65± 0.10) GeV which is compatible with the experimental candidate Y(4660), while for the (ccqq) state we find a mass mY=(4.49± 0.11) GeV, which is higger than the mass of the experimental candidate Y(4350). With the tetraquark structure we are working we can not explain the Y(4260) as a tetraquark state. We also consider molecular Ds0Ds^* and D0D^* states. For the Ds0Ds^* molecular state we get m_Ds0Ds^*=(4.42± 0.10) GeV which is consistent, considering the errors, with the mass of the meson Y(4350) and for the D0D^* molecular state we get m_D0D^*=(4.27± 0.10) GeV in excelent agreement with the mass of the meson Y(4260).