Abstract
Using the data sample of collected with the Belle detector operating at the KEKB asymmetric-energy collider, we present the results of an investigation of the and invariant mass distributions looking for substructure in the decay . We find a significant signal in each mass distribution. When interpreted as resonances, we find for the () combination a mass of [], an intrinsic width of [] with a significance of (). As these two signals are very close to the threshold, we also investigate the possibility of a cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.
- Received 21 November 2022
- Accepted 15 March 2023
DOI:https://doi.org/10.1103/PhysRevLett.130.151903
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