Partial wave analysis of $\psi(3686)\to\Lambda\bar\Sigma^0\pi^0+c.c.$

TL;DR

This study performs a partial wave analysis of the decay (3686) to investigate * and * resonances, measuring their properties and the decay's branching fraction using a large data sample from BESIII.

Contribution

It provides the first measurement of the branching fraction and detailed resonance contributions in (3686) decay to  and * states.

Findings

Identified multiple * and * resonances contributing to the decay.

Measured the branching fraction of (3686)  (3686) decay for the first time.

Determined masses, widths, and production rates of various hyperon resonances.

Abstract

Based on a sample of $(2712.4\pm14.3)\times10^6\;\psi(3686)$ events collected with the BESIII detector, a partial wave analysis of the decay $\psi(3686)\to\Lambda\bar\Sigma^0\pi^0+c.c.$ is performed to investigate $\Lambda^*$ and $\Sigma^*$ resonances in the $\pi^0\bar{\Sigma}^0$ and $\pi^0\Lambda$ invariant mass distributions. Significant contributions are found from the $\Lambda(1405)$, $\Lambda(1520)$, $\Lambda(1600)$, $\Lambda(1670)$, $\Lambda(1690)$, $\Lambda(1800)$, $\Lambda(1890)$, $\Lambda(2325)$, $\Sigma(1385)$, $\Sigma(1660)$, $\Sigma(1670)$, $\Sigma(1750)$, and $\Sigma(1910)$. The masses, widths, and production branching fractions for each component are determined. In addition, the branching fraction of $\psi(3686)\to\Lambda\bar\Sigma^0\pi^0+c.c.$ is measured to be $(1.544\pm0.013\pm0.069)\times10^{-4}$ for the first time, where the first uncertainty is statistical and the second systematic.