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Observation of the Singly Cabibbo-Suppressed Decay $\Lambda_{c}^{+} \to n\pi^{+}$
- Source :
- Phys. Rev. Lett. 128 (2022) 142001
- Publication Year :
- 2022
-
Abstract
- The singly Cabibbo-suppressed decay $\Lambda_{c}^{+} \to n\pi^{+}$ is observed for the first time with a statistical significance of $7.3\sigma$ by using 3.9 $\mathrm{fb}^{-1}$ of $e^{+}e^{-}$ collision data collected at center-of-mass energies between 4.612 and 4.699 GeV with the BESIII detector at BEPCII. The branching fraction of $\Lambda_{c}^{+} \to n\pi^{+}$ is measured to be $(6.6\pm1.2_{\rm stat}\pm0.4_{\rm syst})\times 10^{-4}$. By taking the upper limit of branching fractions of $\Lambda_{c}^{+} \to p\pi^0$ from the Belle experiment, the ratio of branching fractions between $\Lambda_{c}^{+} \to n\pi^{+}$ and $\Lambda_{c}^{+} \to p\pi^0$ is calculated to be larger than 7.2 at the 90% confidence level, which disagrees with the current predictions of available phenomenological models. In addition, the branching fractions of the Cabibbo-favored decays $\Lambda_{c}^{+} \to \Lambda\pi^{+}$ and $\Lambda_{c}^{+} \to \Sigma^{0}\pi^{+}$ are measured to be $(1.31\pm0.08_{\rm stat}\pm0.05_{\rm syst})\times 10^{-2}$ and $(1.22\pm0.08_{\rm stat}\pm0.07_{\rm syst})\times 10^{-2}$, respectively, which are consistent with previous results.<br />Comment: 18 pages,7 figures
- Subjects :
- High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 128 (2022) 142001
- Publication Type :
- Report
- Accession number :
- edsarx.2201.02056
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.128.142001