| Title: |
Observation of +→0 0+, Test of Lepton Flavor Universality, and First Angular Analysis of +→ ¯ *(892)0ℓ+ℓ |
| Authors: |
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Kalantar-Nayestanaki, Nasser; Kavatsyuk, Myroslav |
| Source: |
BESIII Collaboration, Ablikim, M, Achasov, M N, Adlarson, P, Ai, X C, Aliberti, R, Amoroso, A, An, Q, Kalantar-Nayestanaki, N & Kavatsyuk, M 2025, 'Observation of +→0 0+, Test of Lepton Flavor Universality, and First Angular Analysis of +→ ¯ *(892)0ℓ+ℓ', Physical Review Letters, vol. 135, no. 17, 171801 . https://doi.org/10.1103/w9vz-4fq9 |
| Publication Year: |
2025 |
| Collection: |
University of Groningen research database |
| Description: |
We report a study of the semileptonic decays +→00ℓ+ℓ (ℓ =, ) based on 20.3 fb−1 of +− collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector. The +→00+ decay is observed for the first time, with a branching fraction of (0.896±0.017stat±0.008syst)%, and the branching fraction of +→00+ is determined with the improved precision as (0.943±0.012stat±0.010syst)%. From the analysis of the dynamics, we observe that the dominant ¯*(892)0 component is accompanied by an -wave contribution, which accounts for (7.10±0.68stat±0.41syst)% of the total decay rate of the + channel and (6.39±0.17stat±0.14syst)% of the + channel. Assuming a single-pole dominance parametrization, the hadronic form factor ratios are extracted to be =(0)/1(0)=1.42±0.03stat±0.02syst and 2=2(0)/1(0)=0.75±0.03stat±0.01syst. Based on the first comprehensive angular and the decay-rate asymmetry analysis, the full set of averaged angular and asymmetry observables are measured as a function of the momentum-transfer squared; they are consistent with expectations from the standard model. No evidence for violation of − lepton-flavor universality is observed in either the full range or the five chosen bins of momentum-transfer squared. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| ISSN: |
0031-9007; 1079-7114 |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/11370/258f56e2-a356-4595-b2f0-977adb5fb852; info:eu-repo/semantics/altIdentifier/pissn/0031-9007; info:eu-repo/semantics/altIdentifier/eissn/1079-7114 |
| DOI: |
10.1103/w9vz-4fq9 |
| Availability: |
https://hdl.handle.net/11370/258f56e2-a356-4595-b2f0-977adb5fb852; https://research.rug.nl/en/publications/258f56e2-a356-4595-b2f0-977adb5fb852; https://doi.org/10.1103/w9vz-4fq9; https://pure.rug.nl/ws/files/1468275410/w9vz-4fq9.pdf |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.757E0370 |
| Database: |
BASE |