The Cabbibo-favored decay ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Xi }}^0{K}^{+}{\pi }^0$ is studied for the first time using $6.1{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Xi }}^0{K}^{+}{\pi }^0$ is measured to be $(7.79\pm 1.46\pm 0.95)\times {10}^{-3}$, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay ${\mathrm{\Lambda }}_c^{+}\to \mathrm{\Xi }(1530{)}^0{K}^{+}$ is $(5.99\pm 1.04\pm 0.32)\times {10}^{-3}$, which is consistent with the previous result of $(5.02\pm 0.99\pm 0.31)\times {10}^{-3}$. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay ${\mathrm{\Lambda }}_c^{+}\to n{K}^{+}{\pi }^0$ is $7.1\times {10}^{-4}$ at the 90% confidence level. The upper limits on the branching fractions of ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^0$ and $\mathrm{\Lambda }{K}^{+}{\pi }^0$ are also determined to be $1.8\times {10}^{-3}$ and $2.0\times {10}^{-3}$, respectively.

• Received 7 November 2023
• Accepted 23 January 2024

DOI:https://doi.org/10.1103/PhysRevD.109.052001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society