Amplitude analysis of Ξ⁰_c → Λ⁰ K⁻ π⁺

The Belle II experiment at the SuperKEKB asymmetric e⁺e⁻ collider in Tsukuba Japan is designed to make precision measurements in flavor physics at the “intensity frontier”. Low backgrounds with a known collision energy gives Belle II unique opportunities over other collider experiments.

The Belle experiment performed many measurements using baryon decays including Λ, Ξ⁰_c , Ξ⁺_c , and ?_c, but few have been subjected to an amplitude analysis. Since the excited Ξ spectrum is not well understood and contains potentially exotic states, an amplitude analysis of Ξ⁰_c decays has the potential to expose the presence of new states and measure their quantum numbers and other properties. This Ξ⁰_c → Λ⁰ K⁻ π⁺ decay mode has a reasonably large branching fraction (1.45%) and includes potential resonant substructure including the potentially exotic states Ξ(1690)⁻ and Ξ(1820)⁻. I will present an ongoing amplitude analysis on Ξ⁰_c → Λ⁰ K⁻ π⁺ to measure the branching fraction and spin-parity of resonant substructures using Belle II simulations.