Observation of a rare beta decay of the charmed baryon with a Graph Neural Network
Abstract The beta decay of the lightest charmed baryon $${\Lambda }_{c}^{+}$$ Λ c + provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-M...
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2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55042-y |
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| author | The BESIII Collaboration |
| author_facet | The BESIII Collaboration |
| author_sort | The BESIII Collaboration |
| collection | DOAJ |
| description | Abstract The beta decay of the lightest charmed baryon $${\Lambda }_{c}^{+}$$ Λ c + provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters. This article presents the first observation of the Cabibbo-suppressed decay $${\Lambda }_{c}^{+}\to n{e}^{+}{\nu }_{e}$$ Λ c + → n e + ν e , utilizing 4.5 fb−1 of electron-positron annihilation data collected with the BESIII detector. A novel Graph Neural Network based technique effectively separates signals from dominant backgrounds, notably $${\Lambda }_{c}^{+}\to \Lambda {e}^{+}{\nu }_{e}$$ Λ c + → Λ e + ν e , achieving a statistical significance exceeding 10σ. The absolute branching fraction is measured to be (3.57 ± 0.34stat. ± 0.14syst.) × 10−3. For the first time, the CKM matrix element $$\left\vert {V}_{cd}\right\vert$$ V c d is extracted via a charmed baryon decay as $$0.208\pm 0.01{1}_{{{{\rm{exp.}}}}}\pm 0.00{7}_{{{{\rm{LQCD}}}}}\pm 0.00{1}_{{\tau }_{{\Lambda }_{c}^{+}}}$$ 0.208 ± 0.01 1 exp. ± 0.00 7 LQCD ± 0.00 1 τ Λ c + . This work highlights a new approach to further understand fundamental interactions in the charmed baryon sector, and showcases the power of modern machine learning techniques in experimental high-energy physics. |
| format | Article |
| id | doaj-art-90f9ed5d575545c891198c05cbbc8bdc |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-90f9ed5d575545c891198c05cbbc8bdc2025-01-19T12:31:10ZengNature PortfolioNature Communications2041-17232025-01-0116111210.1038/s41467-024-55042-yObservation of a rare beta decay of the charmed baryon with a Graph Neural NetworkThe BESIII Collaboration0Institute of High Energy PhysicsAbstract The beta decay of the lightest charmed baryon $${\Lambda }_{c}^{+}$$ Λ c + provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters. This article presents the first observation of the Cabibbo-suppressed decay $${\Lambda }_{c}^{+}\to n{e}^{+}{\nu }_{e}$$ Λ c + → n e + ν e , utilizing 4.5 fb−1 of electron-positron annihilation data collected with the BESIII detector. A novel Graph Neural Network based technique effectively separates signals from dominant backgrounds, notably $${\Lambda }_{c}^{+}\to \Lambda {e}^{+}{\nu }_{e}$$ Λ c + → Λ e + ν e , achieving a statistical significance exceeding 10σ. The absolute branching fraction is measured to be (3.57 ± 0.34stat. ± 0.14syst.) × 10−3. For the first time, the CKM matrix element $$\left\vert {V}_{cd}\right\vert$$ V c d is extracted via a charmed baryon decay as $$0.208\pm 0.01{1}_{{{{\rm{exp.}}}}}\pm 0.00{7}_{{{{\rm{LQCD}}}}}\pm 0.00{1}_{{\tau }_{{\Lambda }_{c}^{+}}}$$ 0.208 ± 0.01 1 exp. ± 0.00 7 LQCD ± 0.00 1 τ Λ c + . This work highlights a new approach to further understand fundamental interactions in the charmed baryon sector, and showcases the power of modern machine learning techniques in experimental high-energy physics.https://doi.org/10.1038/s41467-024-55042-y |
| spellingShingle | The BESIII Collaboration Observation of a rare beta decay of the charmed baryon with a Graph Neural Network Nature Communications |
| title | Observation of a rare beta decay of the charmed baryon with a Graph Neural Network |
| title_full | Observation of a rare beta decay of the charmed baryon with a Graph Neural Network |
| title_fullStr | Observation of a rare beta decay of the charmed baryon with a Graph Neural Network |
| title_full_unstemmed | Observation of a rare beta decay of the charmed baryon with a Graph Neural Network |
| title_short | Observation of a rare beta decay of the charmed baryon with a Graph Neural Network |
| title_sort | observation of a rare beta decay of the charmed baryon with a graph neural network |
| url | https://doi.org/10.1038/s41467-024-55042-y |
| work_keys_str_mv | AT thebesiiicollaboration observationofararebetadecayofthecharmedbaryonwithagraphneuralnetwork |