Mr Joshua Berlin (University of Frankfurt)
To investigate the light scalar tetraquark candidate $a_0(980)$ (quantum numbers $J^P=0^+$), 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 we present numerical results for diagrams with closed quark loops and present evidence that such diagrams are not negligible, i.e. that their contribution is essential to obtain physically meaningful results.
Dr Abdou Abdel-Rehim (Cyprus Institute) Prof. Constantia Alexandrou (Cyprus Institute) Dr Jacob Finkenrath (The Cyprus Institute) Mr Joshua Berlin (University of Frankfurt) Prof. Marc Wagner (Goethe University Frankfurt) Dr Mario Gravina (Università della Calabria) Dr Mattia Dalla Brida (DESY - Zeuthen) Dr Theodoros Leontiou (Cyprus Institute)