Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8188015 | Physics Letters B | 2013 | 5 Pages |
Abstract
The spectrum of tetraquark states with hidden charm is studied within an effective Coulomb gauge Hamiltonian approach. Of the four independent color schemes, two are investigated, the (qc¯)1(cq¯)1 singlet-singlet (molecule) and the (qc)3(q¯c¯)3 triplet-triplet (diquark), for selected JPC states using a variational method. The predicted masses of triplet-triplet tetraquarks are roughly a GeV heavier than the singlet-singlet states. There is also an interesting flavor dependence with (qq¯)1(cc¯1) states about half a GeV lighter than (qc¯)1(q¯c)1. The lightest 1++ and 1ââ predictions are in agreement with the observed X(3872) and Y(4008) masses suggesting they are molecules with ÏJ/Ï and ηhc, rather than DâD¯â and DD¯, type structure, respectively. Similarly, the lightest isovector 1++ molecule, having a ÏJ/Ï flavor composition, has mass near the recently observed charged Zc(3900) value. These flavor configurations are consistent with observed X, Y and Zc decays to ÏÏJ/Ï.
Related Topics
Physical Sciences and Engineering
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Nuclear and High Energy Physics
Authors
W. Xie, L.Q. Mo, Ping Wang, Stephen R. Cotanch,