Measurements of absolute branching fractions for Λc+→Ξ0K+ and Ξ(1530)0K+

We report the first measurements of absolute branching fractions for the W-exchange-only processes ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$ and ${\Lambda }_c^{+}\to \Xi {\left(1530\right)}^0{K}^{+}$ with the double-tag technique, by analyzing an $e^{+}{e}^{-}$ collision data sample, that corresponds to an integrated luminosity of 567 pb⁻¹ collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be $B({\Lambda }_c^{+}\to {\Xi }^0{K}^{+})=(5.90\pm 0.86\pm 0.39)\times {10}^{-3}$ and $B({\Lambda }_c^{+}\to \Xi {\left(1530\right)}^0{K}^{+})=(5.02\pm 0.99\pm 0.31)\times {10}^{-3}$, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.