Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Université Paris-Saclay, Joint Institute for Nuclear Research

Journal

EPJ Web of Conferences

Anzahl der Seiten

8

ISSN

2100-014X

DOI

https://doi.org/10.1051/epjconf/202227403004

Publikationsdatum

2022

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

ASJC Scopus Sachgebiete

Mechanical Engineering, Electrical and Electronic Engineering, Physics and Astronomy(all), Space and Planetary Science, Computer Vision and Pattern Recognition

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/zooming-in-on-multiquark-hadrons-within-qcd-sumrule-approaches(25e41e12-153a-4328-b033-15aff841aaaf).html