Tetraquark-adequate QCD sum rules

Author(s)
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
Abstract

With the experimental observation of several credible candidates for multiquark hadrons, the latter states re-entered the focus of interest of theoretical strong-interaction physics. Proper treatment of hadronic bound states by quantum chromodynamics, QCD, the quantum field theory governing all strong interactions, necessitates a nonperturbative approach. A well-established framework of this kind is provided by QCD sum rules relating hadron features to the parameters of QCD. Conceptual reconsideration, however, reveals that, in order to really match the peculiarities of multiquarks, the long-standing conventional QCD sum-rule techniques evidently must be subjected to considerable modification. The so far overlooked necessity for such adaptations is most easily demonstrated for the case of least complexity, that is, for tetraquarks, bound states of two quarks and two antiquarks.

Organisation(s)
Particle Physics
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Universität Wien, Univ Paris Diderot, Centre National de la Recherche Scientifique (CNRS), CNRS - National Institute for Biology (INSB), UDICE-French Research Universities, Universite de Paris, CNRS, Lab Epigenet & Destin Cellulaire, UMR7216
Journal
Proceedings of Science (PoS)
Volume
364
No. of pages
6
DOI
https://doi.org/10.22323/1.364.0536
Publication date
11-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics, 103012 High energy physics
ASJC Scopus subject areas
General
Portal url
https://ucris.univie.ac.at/portal/en/publications/tetraquarkadequate-qcd-sum-rules(b1fd0377-0ede-4344-80a8-271971271393).html