Regular Article - Theoretical Physics
The scalar exotic resonances
NRC “Kurchatov Institute”, Moscow, Russia
Accepted: 4 May 2023
Published online: 16 May 2023
The scalar resonances are considered as exotic four-quark states: , while the X(3863) is proved to be the state. The masses and the widths of these resonances are calculated in the framework of the Extended Recoupling Model, where a four-quark system is formed inside the bag and has relatively small size ( fm). Then the resonance X(3915) appears due to the transitions: into (or and back, while the X(3960) is created due to the transitions into and back, and the is formed in the transitions into and back. The characteristic feature of the recoupling mechanism is that this type of resonances can be predominantly in the S-wave decay channels and has . In two-channel case the resonance occurs to be just near the lower threshold, while due to coupling to third channel (like the channel) it is shifted up and lies by (20–30) MeV above the lower threshold. The following masses and widths are calculated: MeV, MeV; MeV, MeV, MeV, MeV, which are in good agreement with experiment.
© The Author(s) 2023
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development.