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

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

Hadron Spectrum

Collaboration

•

Gavin K. C. Cheung
(
- Cambridge U., DAMTP
)

Sep 5, 2017

31 pages

Published in:

JHEP 11 (2017) 033

Published: Nov 8, 2017

e-Print:

1709.01417 [hep-lat]

DOI:

10.1007/JHEP11(2017)033

Report number:

DAMTP-2017-33,
JLAB-THY-17-2541

View in:

ADS Abstract Service

reference search98 citations

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Abstract: (Springer)

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

Note:

31 pages, 9 figures, minor changes to reflect published version

Lattice field theory simulation
QCD Phenomenology
quark: operator
meson: operator
symmetry: lattice
tetraquark
quantum chromodynamics
lattice field theory
numerical calculations
quark: Wilson

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Figures(9)

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