Scalar mesons and tetraquarks from twisted mass lattice QCD
نویسندگان
چکیده
1 Goethe-Universität Frankfurt am Main, Institut für Theoretische Physik, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany 2 Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus 3 Computation-based Science and Technology Research Center, Cyprus Institute, 20 Kavafi Str., Nicosia 2121, Cyprus 4 Helmholtz-Institut für Strahlenund Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany 5 School of Mathematics, Trinity College, Dublin 2, Ireland 6 ECT⋆, Strada delle Tabarelle, 286, I-38123, Trento, Italy 7 NIC, DESY Zeuthen, Platanenallee 6, D-15738 Zeuthen, Germany 8 Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, D-12489 Berlin, Germany
منابع مشابه
Scalar mesons and tetraquarks by means of lattice QCD European Twisted Mass Collaboration (ETMC):
We study the light scalar mesons a0(980) and κ using N f = 2+ 1+ 1 flavor lattice QCD. In order to probe the internal structure of these scalar mesons, and in particular to identify, whether a sizeable tetraquark component is present, we use a large set of operators, including diquarkantidiquark, mesonic molecule and two-meson operators. The inclusion of disconnected diagrams, which are technic...
متن کاملar X iv : h ep - p h / 05 08 14 2 v 1 1 1 A ug 2 00 5 Nature of the light scalar mesons
Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in the usual q ¯ q structure. We study the description of the scalar mesons below 2 GeV in terms of the mixing of a chiral nonet of tetraquarks with conventional q ¯ q states. A strong diquark-antidiquark component is found for several states. The consideration of a glueball as dictated by quenched...
متن کاملLattice QCD with two light Wilson quarks and maximally twisted mass
We summarise status and recent results of the European Twisted Mass collaboration (ETMC). The collaboration has been generating gauge configurations for three different values of the lattice spacing a . 0.1 fm and values of the charged pseudo scalar mass as low as 300 MeV with two flavours of maximally twisted mass quarks. We provide evidence that O(a) improvement works very well with maximally...
متن کاملSe p 20 08 A lattice study of light scalar tetraquarks with isopins 0 , 1 / 2 and 1
The observed mass pattern of scalar resonances below 1 GeV gives preference to the tetraquark assignment over the conventional q̄q assignment for these states. We present a search for tetraquarks with isospins 0,1/2,1 in lattice QCD, where isospin channels 1/2 and 1 have not been studied before. Our simulation uses Chirally Improved fermions on quenched gauge configurations. We determine three e...
متن کاملA lattice study of light scalar tetraquarks
The observed mass pattern of scalar resonances below 1 GeV gives preference to the tetraquark assignment over the conventional q̄q assignment for these states. We present a search for tetraquarks with isospins 0, 1/2, 1 in lattice QCD, where the isospin channels 1/2 and 1 have not been studied before. We determine three energy levels in each isospin channel using the variational method. The scat...
متن کامل