Abstract
Quantum chromodynamics presents a series of exact and approximate symmetries which can be exploited to predict new hadrons from previously known ones. The and , which have been theorized to be isovector and molecules [], are no exception. Here we argue that from SU(3)-flavor symmetry, we should expect the existence of strange partners of the ’s with hadronic molecular configurations and (or, equivalently, quark content , with , ). The quantum numbers of these and structures would be . The predicted masses of these partners depend on the details of the theoretical scheme used, but they should be around the and thresholds, respectively. Moreover, any of these states could be either a virtual pole or a resonance. We show that, together with a possible triangle singularity contribution, such a picture nicely agrees with the very recent BESIII data of the .
- Received 18 November 2020
- Accepted 1 April 2021
DOI:https://doi.org/10.1103/PhysRevD.103.074029
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society