First observation of ${\Lambda }_c(2595{)}^{+}\to {\Lambda }_c^{+}{\pi }^0{\pi }^0$ and ${\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^0{\pi }^0$

Abstract

By analysing $e^{+}{e}^{-}$ annihilation data corresponding to an integrated luminosity of 368.48~pb${}^{-1}$ collected at the centre-of-mass energies of $\sqrt{s}=4.918$ and $4.951$~GeV with the BESIII detector, we report the first observation of ${\Lambda }_c(2595{)}^{+}$ and ${\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^0{\pi }^0$ with statistical significances of 7.9$\sigma$ and 11.8$\sigma$, respectively. The branching fractions of ${\Lambda }_c(2595{)}^{+}$ and ${\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^0{\pi }^0$ are measured to be $(59.5\pm 11.1_{stat.}\pm 7.9_{syst.})\%$ and $(41.0\pm 5.2_{stat.}\pm 3.3_{syst.})\%$, respectively. The absolute branching fraction of ${\Lambda }_c(2595{)}^{+}$ is consistent with the expectation of the mechanism referred to as the threshold effect, proposed for the strong decays of ${\Lambda }_c(2595{)}^{+}$ within uncertainty.

arXiv comment20 pages, 4 figures

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