# Study of the decays $\psi(3686)\rightarrow\gamma\chi_{cJ}\rightarrow\gamma\bar{p}K^{*+}\Lambda+c.c.$ and $\psi(3686)\rightarrow\bar{p}K^{*+}\Lambda+c.c.$

## TL;DR

This study measures the first observations of specific decay modes of the $ ext{psi}(3686)$ particle involving baryons and mesons, providing precise branching fractions based on a large dataset from BESIII.

## Contribution

The paper reports the first measurement of branching fractions for $ ext{psi}(3686)$ decays into $ar{p}K^{*+}\Lambda$ and $ ext{chi}_{cJ}
ightarrowar{p}K^{*+}\Lambda$, expanding knowledge of charmonium decay channels.

## Key findings

- Branching fractions for $ ext{chi}_{cJ}$ decays measured.
- First observation of these decay modes.
- Precise values with statistical and systematic uncertainties.

## Abstract

Based on the data sample of $448.1\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector at BEPCII, we present a study of the decays $\psi(3686)\rightarrow\gamma\chi_{cJ}\rightarrow\gamma\bar{p}K^{*+}\Lambda+c.c.$ and $\psi(3686)\rightarrow\bar{p}K^{*+}\Lambda+c.c.$. The branching fractions of $\chi_{cJ}\rightarrow\bar{p}K^{*+}\Lambda+c.c.$ ($J$=0, 1, 2) are measured to be $(4.8\pm0.7\pm0.5)\times10^{-4}$, $(5.0\pm0.5\pm0.4)\times10^{-4}$, and $(8.2\pm0.9\pm0.7)\times10^{-4}$, respectively, where the first uncertainties are statistical and the second systematic. The branching fraction of $\psi(3686)\rightarrow\bar{p}K^{*+}\Lambda+c.c.$ is measured to be $(6.3\pm0.5\pm0.5)\times10^{-5}$. All these decay modes are observed for the first time.