Reanalysis of the Y(3940), Y(4140), Z_c(4020), Z_c(4025) and Z_b(10650) as molecular states with QCD sum rules

2014/03/31 by Zhi-Gang Wang · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-014-2963-7

published as Eur.Phys.J.C74(2014)2963 · 24 pages, 26 figures. arXiv admin note: substantial text overlap with arXiv:1312.1537, arXiv:1312.7489, arXiv:1311.1046, arXiv:1312.2652

arxiv created 2014/06/10 · arxiv updated 2014/07/18

Abstract

In this article, we calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion, and study the J^PC=0⁺⁺, 1^+-, 2⁺⁺ D^*D^*, D_s^*D_s^*, B^*B^*, B_s^*B_s^* molecular states with the QCD sum rules. In calculations, we use the formula μ=√M²_X/Y/Z-(2\mathbbM_Q)² to determine the energy scales of the QCD spectral densities. The numerical results favor assigning the Z_c(4020) and Z_c(4025) as the J^PC=0⁺⁺, 1^+- or 2⁺⁺ D^*D^* molecular states, the Y(4140) as the J^PC=0⁺⁺ D^*_sD_s^* molecular state, the Z_b(10650) as the J^PC=1^+- B^*B^* molecular state, and disfavor assigning the Y(3940) as the (J^PC=0⁺⁺) molecular state. The present predictions can be confronted to the experimental data in the futures.

Citations

• Possible assignments of the X(3872), Z_c(3900) and Z_b(10610) as axial-vector molecular states
• Analysis of the Z_c(4020), Z_c(4025), Y(4360) and Y(4660) as vector tetraquark states with QCD sum rules

Cited by

• Tetraquark state candidates: Y(4140), Y(4274) and X(4350)
• Reanalysis of the Z_c(4020), Z_c(4025), Z(4050) and Z(4250) as tetraquark states with QCD sum rules