期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 11, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP11(2017)033
关键词
Lattice field theory simulation; QCD Phenomenology
资金
- Cambridge European Trust
- St John's College, Cambridge
- U.K. Science and Technology Facilities Council (STFC) [ST/L000385/1]
- U.S. Department of Energy Early Career award [DE-SC0006765]
- U.S. Department of Energy, under which Jefferson Science Associates, LLC [DE-AC05-06OR23177]
- BIS National E-infrastructure capital grant [ST/K001590/1, ST/K000373/1]
- STFC capital grants [ST/H008861/1, ST/H00887X/1]
- STFC DiRAC Operations grant [ST/K00333X/1, ST/K0003259/1]
- Rolls Royce
- Mitsubishi Heavy Industries
- U.S. Department of Energy INCITE program at Oak Ridge National Lab
- NSF Teragrid at the Texas Advanced Computer Center
- Pittsburgh Supercomputer Center
- Jefferson Lab
- Science and Technology Facilities Council [ST/R00689X/1, ST/R002452/1, ST/P002307/1, ST/P002315/1, ST/M007073/1, ST/M006948/1, 1479806, ST/L000385/1] Funding Source: researchfish
- STFC [ST/R002452/1, ST/P002307/1, ST/P002315/1, ST/L000385/1, ST/R00689X/1, ST/M007073/1, ST/M006948/1] Funding Source: UKRI
We present a general class of operators resembling compact tetraquarks which have a range of colour-flavour-spin structures, transform irreducibly under the symmetries of the lattice and respect other relevant symmetries. These constructions are demonstrated in lattice QCD calculations with light quarks corresponding to m(pi) = 391 MeV. Using the distillation framework, correlation functions involving large bases of meson-meson and tetraquark operators are computed in the isospin-1 hidden-charm and doubly-charmed sectors, and finite-volume spectra are extracted with the variational method. We find the spectra are insensitive to the addition of tetraquark operators to the bases of meson-meson operators. For the first time, through using diverse bases of meson-meson operators, the multiple energy levels associated with meson-meson levels which would be degenerate in the non-interacting limit are extracted reliably. The number of energy levels in each spectrum is found to be equal to the number of expected non-interacting meson-meson levels in the energy region considered and the majority of energies lie close to the non-interacting levels. Therefore, there is no strong indication for any bound state or narrow resonance in the channels we study.
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