PreprintarXiv licencearXiv
First Observation of the Radiative Decay D0 → γω
Abstract
We report the first observation of the radiative charm decay D0 → γω with a significance of 6.0σ. The analysis uses 20.3\,fb−1 of e+e- collision data collected by the BESIII detector at a center-of-mass energy of 3.773\,GeV, and employs a deep learning strategy based on the Particle Transformer architecture. The absolute branching fraction of ℬ(D0→γω)=(2.12± 0.40stat± 0.25syst)× 10−5 confirms the dominance of long-distance hadronic dynamics in radiative charm decays and provides a valuable benchmark for testing non-perturbative QCD calculations of D → γV transitions.
Related
- First observation of weak magnetism in neutron decay
- First observation of the electromagnetic Dalitz decay ψ(3686) → μ+ μ- η′
- First observation of the fine structure of the Pygmy Dipole Resonance in a nucleus away from stability via the β- decay of 92Rb to 92Sr
- First Observation and Dynamical Study of the D+s→ f0(980) μ+νμ Decay
- An Operator Analysis of Radiative Muon Decay
BibTeX
@misc{collaboration2026first,
title = {{First Observation of the Radiative Decay $D^0 \to γω$}},
author = {BESIII Collaboration and M. Ablikim and M. N. Achasov and P. Adlarson and X. C. Ai and C. S. Akondi and R. Aliberti and A. Amoroso and Q. An and Y. H. An and M. S. Anderson and Y. Bai and O. Bakina and H. R. Bao and X. L. Bao and M. Barbagiovanni and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. B. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and I. Boyko and R. A. Briere and A. Brueggemann and D. Cabiati and H. Cai and M. H. Cai and X. Cai and A. Calcaterra and G. F. Cao and N. Cao and S. A. Cetin and X. Y. Chai and J. F. Chang and T. T. Chang and G. R. Che and Y. Z. Che and C. H. Chen and Chao Chen and G. Chen and H. S. Chen and H. Y. Chen and M. L. Chen and S. J. Chen and S. M. Chen and T. Chen and W. Chen and X. R. Chen and X. T. Chen and X. Y. Chen and Y. B. Chen and Y. Q. Chen and Z. K. Chen and J. Cheng and L. N. Cheng and S. K. Choi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.21982},
eprint = {2610.21982},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.21982},
}
RIS
TY - UNPB
TI - First Observation of the Radiative Decay D^0 → γω
AU - BESIII Collaboration
AU - M. Ablikim
AU - M. N. Achasov
AU - P. Adlarson
AU - X. C. Ai
AU - C. S. Akondi
AU - R. Aliberti
AU - A. Amoroso
AU - Q. An
AU - Y. H. An
AU - M. S. Anderson
AU - Y. Bai
AU - O. Bakina
AU - H. R. Bao
AU - X. L. Bao
AU - M. Barbagiovanni
AU - V. Batozskaya
AU - K. Begzsuren
AU - N. Berger
AU - M. Berlowski
AU - M. B. Bertani
AU - D. Bettoni
AU - F. Bianchi
AU - E. Bianco
AU - A. Bortone
AU - I. Boyko
AU - R. A. Briere
AU - A. Brueggemann
AU - D. Cabiati
AU - H. Cai
AU - M. H. Cai
AU - X. Cai
AU - A. Calcaterra
AU - G. F. Cao
AU - N. Cao
AU - S. A. Cetin
AU - X. Y. Chai
AU - J. F. Chang
AU - T. T. Chang
AU - G. R. Che
AU - Y. Z. Che
AU - C. H. Chen
AU - Chao Chen
AU - G. Chen
AU - H. S. Chen
AU - H. Y. Chen
AU - M. L. Chen
AU - S. J. Chen
AU - S. M. Chen
AU - T. Chen
AU - W. Chen
AU - X. R. Chen
AU - X. T. Chen
AU - X. Y. Chen
AU - Y. B. Chen
AU - Y. Q. Chen
AU - Z. K. Chen
AU - J. Cheng
AU - L. N. Cheng
AU - S. K. Choi
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.21982
UR - https://arxiv.org/abs/2610.21982
AB - We report the first observation of the radiative charm decay D^0 → γω with a significance of 6.0σ. The analysis uses 20.3\,fb^−1 of e^+e^- collision data collected by the BESIII detector at a center-of-mass energy of 3.773\,GeV, and employs a deep learning strategy based on the Particle Transformer architecture. The absolute branching fraction of ℬ(D^0→γω)=(2.12± 0.40_stat± 0.25_syst)× 10^−5 confirms the dominance of long-distance hadronic dynamics in radiative charm decays and provides a valuable benchmark for testing non-perturbative QCD calculations of D → γV transitions.
ER -