Browsing by Author "Gravina, M."
Now showing items 1-8 of 8
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Conference Object
Computation of correlation matrices for tetraquark candidates with Jp = 0+ and flavor structure q1q2q3q3
Berlin, J.; Abdel-Rehim, A.; Alexandrou, Constantia; Dalla Brida, M.; Gravina, M.; Wagner, M. (Proceedings of Science (PoS), 2015)The conjecture that several recently observed mesons have a structure, which is not dominated by an ordinary quark-Antiquark pair, but by a four-quark structure, is being actively investigated both theoretical and ...
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Conference Object
Importance of closed quark loops for lattice QCD studies of tetraquarks
Berlin, J.; Abdel-Rehim, A.; Alexandrou, Constantia; Brida, M. D.; Finkenrath, J.; Gravina, M.; Leontiou, Theodoros; Wagner, M. (Proceedings of Science (PoS), 2016)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 ...
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Article
Investigation of light and heavy tetraquark candidates using lattice QCD
Wagner, M.; Abdel-Rehim, A.; Alexandrou, Constantia; Brida, M. D.; Gravina, M.; Koutsou, Giannis; Scorzato, L.; Urbach, C. (2014)We review the status of an ongoing long-term lattice investigation of the spectrum and structure of tetraquark candidates. We focus on the light scalar meson a0(980). First steps regarding the study of a possibly existing ...
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Article
Lattice investigation of the scalar mesons a0(980) and κ using four-quark operators
Alexandrou, Constantia; Daldrop, J. O.; Brida, M. D.; Gravina, M.; Scorzato, L.; Urbach, C.; Wagner, M. (2013)We carry out an exploratory study of the isospin one a0(980) and the isospin one-half κ scalar mesons using Nf = 2 + 1 + 1 Wilson twisted mass fermions at one lattice spacing. The valence strange quark is included as an ...
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Conference Object
Scalar mesons and tetraquarks by means of lattice QCD
Wagner, M.; Alexandrou, Constantia; Gravina, M.; Daldrop, J. O.; Urbach, C.; Brida, M. D.; Scorzato, L.; Wiese, C. (2012)We study the light scalar mesons a0(980) and κ using Nf = 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 ...
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Article
Scalar mesons and tetraquarks from twisted mass lattice QCD
Wagner, M.; Alexandrou, Constantia; Daldrop, J. O.; Brida, M. D.; Gravina, M.; Scorzato, L.; Urbach, C.; Wiese, C. (2013)We study light scalar mesons with particular focus on the a 0(980) using lattice QCD with 2+1+1 dynamical quark flavors. To investigate the structure of these scalar mesons and to identify, whether a sizeable tetraquark ...
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Article
Strange and charm baryon masses with two flavors of dynamical twisted mass fermions
Alexandrou, Constantia; Carbonell, J.; Christaras, D.; Drach, V.; Gravina, M.; Papinutto, M. (2012)The masses of the low-lying strange and charm baryons are evaluated using two degenerate flavors of twisted mass sea quarks for pion masses in the range of about 260 to 450MeV. The strange and charm valence quark masses ...
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Conference Object
Study of the a0(980) on the lattice
Wagner, M.; Abdel-Rehim, A.; Alexandrou, Constantia; Gravina, M.; Koutsou, Giannis; Brida, M. D.; Scorzato, L.; Urbach, C. (Proceedings of Science (PoS), 2013)We present lattice results for the a0(980) state using a variational approach with a variety of creation operators: quark- Antiquark, mesonic molecule, diquark- Antidiquark as well as two-meson type. Focus is put on recent ...