Tetraquark operators in lattice QCD and exotic flavour states in the charm sector

Cheung, Gavin K. C.; Thomas, Christopher E.; Dudek, Jozef J.; Edwards, Robert G.

doi:10.1007/JHEP11(2017)033

Title: Tetraquark operators in lattice QCD and exotic flavour states in the charm sector

Journal Article · Tue Nov 07 23:00:00 EST 2017 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP11(2017)033 · OSTI ID:1416530

Cheung, Gavin K. C. ^[1];

^[1]; Dudek, Jozef J. ^[2]; Edwards, Robert G. ^[3]

Univ. of Cambridge, Cambridge (United Kingdom)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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_π = 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. Furthermore, there is no strong indication for any bound state or narrow resonance in the channels we study.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: DOE Office of Science; USDOE

Contributing Organization:: for the Hadron Spectrum collaboration

Grant/Contract Number:: AC05-06OR23177; SC0006765

OSTI ID:: 1416530

Report Number(s):: JLAB-THY--17-2541; DOE/OR/23177--4205; arXiv:1709.01417; PII: 7009

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 11 Vol. 2017; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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