Journal article

Publication year: 2020

Journal: Physical Review D

Volume number: 102

Issue number: 5

ISSN: 2470-0010

eISSN: 2470-0029

Open access status: Hybrid

DOI Link: https://doi.org/10.1103/PhysRevD.102.051501

Publisher: American Physical Society

Abstract: 
Models proposed to explain recently discovered heavy-light four-quark states already assume certain internal structures, i.e., the (anti)quark constituents are grouped into diquark/antidiquark clusters, heavymeson/light-meson clusters (hadrocharmonium) or heavy-light meson molecules. We propose and use an approach to four-quark states based on Dyson-Schwinger and Bethe-Salpeter equations that has the potential to discriminate between these models. We study the masses of heavy-light cq (q) over bar(c) over bar and cc (q) over bar(q) over bar four-quark states with q 1/4 u, d, s and quantum numbers I(J(PC)) = 0(1++); 1(1+-); (0++) and 1(0+); (1+); 1(1+). We identify the dominant components of the ground states with these quantum numbers and suggest candidates for corresponding experimental states. Most notably, we find strong heavy-light meson-meson and negligible diquark-antidiquark components in all cq (q) over bar(c) over bar states, whereas for cc (q) over bar(q) over bar states diquarks are present. A potential caveat in the I = 0 channels is the necessary but costly inclusion of c c components which is relegated to future work.

Harvard Citation style: Wallbott, P., Eichmann, G. and Fischer, C. (2020) Disentangling different structures in heavy-light four-quark states, Physical Review D, 102(5), Article 051501. https://doi.org/10.1103/PhysRevD.102.051501

APA Citation style: Wallbott, P., Eichmann, G., & Fischer, C. (2020). Disentangling different structures in heavy-light four-quark states. Physical Review D. 102(5), Article 051501. https://doi.org/10.1103/PhysRevD.102.051501