Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches
- Author(s)
- Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
- Abstract
Aiming at self-consistent descriptions of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks) by means of QCD sum rules, we note that the totality of contributions to two-point or three-point correlation functions that involve, respectively, either two or just a single operator capable of interpolating the particular multiquark under study can be straightforwardly disentangled into two disjoint classes defined by unambiguously identifiable members. The first is formed by so-called multiquark-phile contributions which indeed might support multiquarks. In the case of flavour-exotic tetraquarks, by definition composed of four (anti-) quarks of mutually different flavours, a tetraquark-phile contribution has to exhibit two or more gluon exchanges of appropriate topology. The second consists of contributions evidently not bearing any relation to multiquarks; these must be discarded when studying multiquarks by QCD sum rules. The first class only should enter the “multiquark-adequate” QCD sum rules for exotic hadrons.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Österreichische Akademie der Wissenschaften (ÖAW), Anuchin Research Institute and Museum of Anthropology, University of Vienna, Université Paris Saclay, Joint Institute for Nuclear Research
- Journal
- EPJ Web of Conferences
- No. of pages
- 8
- ISSN
- 2100-014X
- DOI
- https://doi.org/10.1051/epjconf/202227403004
- Publication date
- 2022
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- ASJC Scopus subject areas
- Mechanical Engineering, Electrical and Electronic Engineering, General Physics and Astronomy, Space and Planetary Science, Computer Vision and Pattern Recognition
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/25e41e12-153a-4328-b033-15aff841aaaf