| Title: |
Study of the electromagnetic Dalitz decay / →+−0 |
| Authors: |
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X.C.; Aliberti, R.; Amoroso, A.; Kalantar-Nayestanaki, Nasser; Kavatsyuk, Myroslav; Messchendorp, Johan |
| Source: |
BESIII Collaboration, Ablikim, M, Achasov, M N, Adlarson, P, Afedulidis, O, Ai, X C, Aliberti, R, Amoroso, A, Kalantar-Nayestanaki, N, Kavatsyuk, M & Messchendorp, J 2025, 'Study of the electromagnetic Dalitz decay / →+−0', Physical Review D, vol. 112, no. 1, L011101 . https://doi.org/10.1103/yglh-sfbg |
| Publication Year: |
2025 |
| Collection: |
University of Groningen research database |
| Description: |
We report the first measurement of the dielectron invariant mass dependent transition form factor in the electromagnetic Dalitz decay J=ψ → eþe−π0 using ð10087 ± 44Þ × 106 J=ψ events collected by the BESIII detector. A clear ρ − ω interference structure is observed, consistent with the pion form factor, which offers a novel approach to extract the hadronic vacuum polarization contribution to the anomalous muon magnetic moment (aμ) and refine the predictions of the vector meson dominance (VMD) model and hadronic light-by-light contribution to aμ. By taking into account the contribution of this ρ − ω interference structure, the branching fraction of J=ψ → eþe−π0 in the full eþe− invariant mass range is also measured for the first time to be ð8.06 ± 0.31ðstatÞ ± 0.38ðsystÞÞ × 10−7, approximately twice the nonresonant VMD prediction. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| ISSN: |
1550-7998; 0556-2821 |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/11370/36f8df66-073b-47c0-9120-ecc6552596c5; info:eu-repo/semantics/altIdentifier/pissn/1550-7998; info:eu-repo/semantics/altIdentifier/eissn/0556-2821 |
| DOI: |
10.1103/yglh-sfbg |
| Availability: |
https://hdl.handle.net/11370/36f8df66-073b-47c0-9120-ecc6552596c5; https://research.rug.nl/en/publications/36f8df66-073b-47c0-9120-ecc6552596c5; https://doi.org/10.1103/yglh-sfbg; https://pure.rug.nl/ws/files/1481750192/yglh-sfbg.pdf |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.6A852DC2 |
| Database: |
BASE |