Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to p{\pi }^0$

Abstract

Utilizing 4.5${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$ is presented, with a statistical significance of $5.4\sigma$. The ratio of the branching fractions of ${\Lambda }_c^{+}\to p{\pi }^0$ and ${\Lambda }_c^{+}\to p\eta$ is measured as $\mathcal{B}({\Lambda }_c^{+}\to p{\pi }^0)/\mathcal{B}({\Lambda }_c^{+}\to p\eta )=(0.120\pm 0.026_{stat.}\pm 0.007_{syst.})$. This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.

arXiv comment9 pages, 4 figures

References in corpus (36)

• Design and Construction of the BESIII Detector
• ParticleNet: Jet Tagging via Particle Clouds
• Jet Substructure at the Large Hadron Collider: A Review of Recent Advances in Theory and Machine Learning
• Jet Substructure at the Large Hadron Collider: Experimental Review
• Precision measurement of the integrated luminosity of the data taken by BESIII at center of mass energies between 3.810 GeV and 4.600 GeV
• Test Flavor SU(3) symmetry in Exclusive ${\Lambda }_c$ decays
• Charmed Baryon Physics Circa 2021
• Cabibbo-allowed nonleptonic weak decays of charmed baryons
• Thinking outside the ROCs: Designing Decorrelated Taggers (DDT) for jet substructure
• Anti-triplet charmed baryon decays with SU(3) Flavor Symmetry
• Singly Cabibbo-suppressed hadronic decays of ${\Lambda }_c^{+}$
• Luminosities and energies of $e^{+}{e}^{-}$ collision data taken between $\sqrt{s}$=4.612 GeV and 4.946 GeV at BESIII
• Study of the Standard Model with weak decays of charmed hadrons at BESIII
• Recent Progress in Leptonic and Semileptonic Decays of Charmed Hadrons
• DisCo Fever: Robust Networks Through Distance Correlation
• SU(3)_flavor analysis of two-body weak decays of charmed baryons
• Machine Learning Uncertainties with Adversarial Neural Networks
• Modern Machine Learning and Particle Physics
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Analysis of Two-Body Decays of Charmed Baryons Using the Quark-Diagram Scheme
• Asymmetries of anti-triplet charmed baryon decays
• Two-body hadronic weak decays of antitriplet charmed baryons
• A diagrammatic analysis of two-body charmed baryon decays with flavor symmetry
• Singly Cabibbo suppressed decays of ${\Lambda }_c^{+}$ with SU(3) flavor symmetry
• Evidence for the singly-Cabibbo-suppressed decay ${\Lambda }_c^{+}\to p\eta$ and search for ${\Lambda }_c^{+}\to p{\pi }^0$
• Final-state rescattering mechanism of charmed baryon decays
• Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic $\text{ep}$ scattering at HERA
• Cabibbo-suppressed non-leptonic decays of Lambda_c and final state interaction
• Measurements of the branching fractions of ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p{\pi }^0$ decays at Belle
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to n{\pi }^{+}$
• Observation of a rare beta decay of the charmed baryon with a Graph Neural Network
• New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2{\varphi }_1$ in $B^0\to J/\psi K_{\text{S}}^0$ decays
• Measurement of the branching fractions of the singly Cabibbo-suppressed decays ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p\omega$
• Measurement of the absolute branching fraction of ${\Lambda }_c^{+}\to p{K}_{\mathrm{S}}^0\eta$ decays
• Observation of the $J/\psi$ and $\psi (3686)$ decays into $\eta {\Sigma }^{+}{\bar{\Sigma }}^{-}$
• Evidence of the Singly Cabibbo Suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$

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