Measurements of Absolute Branching Fractions for $\hat{I}{›}_c^{+}\to \hat{I}{ž}^0{K}^{+}$ and $\hat{I}ž(1530{)}^0{K}^{+}$

Abstract

We report the first measurements of absolute branching fractions for the $W$-exchange-only processes $\hat{I}{›}_c^{+}\to \hat{I}{ž}^0{K}^{+}$ and $\hat{I}{›}_c^{+}\to \hat{I}ž(1530{)}^0{K}^{+}$ 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 $\mathcal{B}(\hat{I}{›}_c^{+}\to \hat{I}{ž}^0{K}^{+})=(5.90\pm 0.86\pm 0.39)\times 10^{-3}$ and $\mathcal{B}(\hat{I}{›}_c^{+}\to \hat{I}ž(1530{)}^0{K}^{+})=(5.02\pm 0.99\pm 0.31)\times 10^{-3}$, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.

7 pages, 4 figures