Scalar tetraquark candidates on the lattice
- The topic of this thesis is the investigation of scalar tetraquark candidates from lattice QCD. It is motivated by a previous study originating in the twisted mass collaboration. The initial tetraquark candidate of choice is the $a_0(980)$, an isovector in the nonet of light scalars ($J^P=0^+$). This channel is still poorly understood. It displays an inverted mass hierarchy to what is expected from the conventional quark model and the $a_0(980)$ and $f_0(980)$ feature a surprising mass degeneracy. For this reasons the $a_0(980)$ is a long assumed tetraquark candidate in the literature. We follow a methodological approach by studying the sensitivity of the scalar spectrum with fully dynamical quarks to a large basis of two-quark and four-quark creation operators. Ultimately, the candidate has to be identified in the direct vicinity of two two-particles states, which is understandably inevitable for a tetraquark candidate. To succeed in this difficult task two-meson creation operators are essential to employ in this channel. By localized four-quark operators we intend to probe the Hamiltonian on eigenstates with a closely bound four-quark structure.
Author: | Joshua BerlinGND |
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URN: | urn:nbn:de:hebis:30:3-445420 |
Place of publication: | Frankfurt am Main |
Referee: | Marc WagnerORCiDGND, Constantia AlexandrouORCiDGND |
Document Type: | Doctoral Thesis |
Language: | English |
Year of Completion: | 2017 |
Year of first Publication: | 2017 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Granting Institution: | Johann Wolfgang Goethe-Universität |
Date of final exam: | 2017/10/01 |
Release Date: | 2017/10/12 |
Page Number: | xii, 125 |
Note: | Mathematische Formeln im Abstract, durch $$ gekennzeichnet, werden technisch bedingt nicht korrekt dargestellt. |
HeBIS-PPN: | 417730934 |
Institutes: | Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Deutsches Urheberrecht |