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Lattice investigation of the tetraquark candidates a0(980) and kappa · Around

2012

Lattice investigation of the tetraquark candidates a0(980) and kappa

Daldrop, Jan Oliver, Alexandrou, Constantia, Brida, Mattia Dalla et al.

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It is a long discussed issue whether light scalar mesons have sizeable four-quark components.

We present an exploratory study of this question using N_f=2+1+1 twisted mass lattice QCD.
A mixed action approach ignoring disconnected contributions is used to calculate correlator matrices consisting of mesonic molecule, diquark-antidiquark and two-meson interpolating operators with quantum numbers of the scalar mesons a0(980) (1(0^++)) and kappa (1/2(0+)).
The correlation matrices are analyzed by solving the generalized eigenvalue problem.

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2011
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E. Oset, M. Doring, U. G. Meissner and A. Rusetsky, “Chiral unitary theory of scalar mesons in a finite volume,” arXiv:1108.3923 [hep-lat]

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