A Study of Excited Charm-Strange Baryons with Evidence for new Baryons Ξ_c(3055)^+ and Ξ_c(3123)^+

Abstract

We present a study of excited charm-strange baryon states produced in $e^{+}{e}^{-}$ annihilations at or near a center-of-mass energy of $10.58\mathrm{Ge}\mathrm{V}$, in a data sample with an integrated luminosity of $384f{b}^{-1}$ recorded with the BABAR detector at the PEP-II $e^{+}{e}^{-}$ storage rings at the Stanford Linear Accelerator Center. We study strong decays of charm-strange baryons to ${\Lambda }_c^{+}{K}_S^0$, ${\Lambda }_c^{+}{K}^{-}$, ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}$, ${\Lambda }_c^{+}{K}_S^0{\pi }^{-}$, ${\Lambda }_c^{+}{K}_S^0{\pi }^{-}{\pi }^{+}$, and ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$. This study confirms the existence of the states ${\Xi }_c(2980{)}^{+}$, ${\Xi }_c(3077{)}^{+}$, and ${\Xi }_c(3077{)}^0$, with a more accurate determination of the ${\Xi }_c(2980{)}^{+}$ mass and width. We also present evidence for two new states, ${\Xi }_c(3055{)}^{+}$ and ${\Xi }_c(3123{)}^{+}$, decaying through the intermediate resonant modes ${\Sigma }_c(2455{)}^{++}{K}^{-}$ and ${\Sigma }_c(2520{)}^{++}{K}^{-}$, respectively. For each of these baryons, we measure the yield in each final state, determine the statistical significance, and calculate the product of the production cross-section and branching fractions. We also measure the masses and widths of these excited charm-strange baryons.

arXiv commentsubmitted to Phys. Rev. D

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