Abstract
We report on a search for a resonance decaying to a pair of muons in events in the mass range, using of data collected by the Belle II experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of beyond the standard model: a vector boson in the model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below , the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search.
7 More- Received 7 March 2024
- Accepted 29 April 2024
DOI:https://doi.org/10.1103/PhysRevD.109.112015
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