Vector tetraquark state candidates: Y(4260/4220), Y(4360/4320), Y(4390) and Y(4660/4630)

2018/03/31 by Zhi-Gang Wang · 2 citations
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-018-5996-5

published as Eur. Phys. J. C78 (2018) 518 · 18 pages, 14 figures. arXiv admin note: text overlap with arXiv:1311.1046, arXiv:1607.00701

arxiv created 2018/05/01 · arxiv updated 2018/06/26

Abstract

In this article, we construct the C ⊗ γ_μC and Cγ₅ ⊗ γ₅γ_μC type currents to interpolate the vector tetraquark states, then carry out the operator product expansion up to the vacuum condensates of dimension-10 in a consistent way, and obtain four QCD sum rules. In calculations, we use the formula μ=√M²_Y-(2\mathbbM_c)² to determine the optimal energy scales of the QCD spectral densities, moreover, we take the experimental values of the masses of the Y(4260/4220), Y(4360/4320), Y(4390) and Y(4660/4630) as input parameters and fit the pole residues to reproduce the correlation functions at the QCD side. The numerical results support assigning the Y(4660/4630) to be the C ⊗ γ_μC type vector tetraquark state ccss, assigning the Y(4360/4320) to be Cγ₅ ⊗ γ₅γ_μC type vector tetraquark state ccqq, and disfavor assigning the Y(4260/4220) and Y(4390) to be the pure vector tetraquark states.

Citations

• Analysis of the Z_c(4020), Z_c(4025), Y(4360) and Y(4660) as vector tetraquark states with QCD sum rules
• Reanalysis of the X(4140) as axialvector tetraquark state with QCD sum rules

Cited by

• Lowest vector tetraquark states: Y(4260/4220) or Z_c(4100)
• Analysis of the vector tetraquark states with P-waves between the diquarks and antidiquarks via the QCD sum rules