To investigate the light scalar tetraquark candidate a0(980) (quantum numbers JP =0+), a correlation matrix including a variety of two- and four-quark interpolating operators has to be computed. We discuss efficient techniques to compute the elements of this correlation matrix, in particular diagrams with closed quark loops. Furthermore, we present evidence that such diagrams are not negligible given our precision, and their contribution is essential to obtain physically meaningful results. In particular, we find indications of the existence of an "additional" state around the two-particle thresholds of K+ K̄ and η +π, which could correspond to the a0(980) meson.

Berlin, J., Abdel-Rehim, A., Alexandrou, C., Dalla Brida, M., Finkenrath, J., Gravina, M., et al. (2017). Importance of closed quark loops for lattice QCD studies of tetraquarks. Intervento presentato a: 34th International Symposium on Lattice Field Theory (Lattice 2016), Southampton, UK [10.22323/1.256.0128].

Importance of closed quark loops for lattice QCD studies of tetraquarks

Dalla Brida, M;
2017

Abstract

To investigate the light scalar tetraquark candidate a0(980) (quantum numbers JP =0+), a correlation matrix including a variety of two- and four-quark interpolating operators has to be computed. We discuss efficient techniques to compute the elements of this correlation matrix, in particular diagrams with closed quark loops. Furthermore, we present evidence that such diagrams are not negligible given our precision, and their contribution is essential to obtain physically meaningful results. In particular, we find indications of the existence of an "additional" state around the two-particle thresholds of K+ K̄ and η +π, which could correspond to the a0(980) meson.
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Lattice QCD; Hadron spectrum; Tetraquarks; Exotic mesons;
English
34th International Symposium on Lattice Field Theory (Lattice 2016)
2016
2017
256
1
7
128
https://pos.sissa.it/256/128
open
Berlin, J., Abdel-Rehim, A., Alexandrou, C., Dalla Brida, M., Finkenrath, J., Gravina, M., et al. (2017). Importance of closed quark loops for lattice QCD studies of tetraquarks. Intervento presentato a: 34th International Symposium on Lattice Field Theory (Lattice 2016), Southampton, UK [10.22323/1.256.0128].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/183331
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