# Observation of $\psi(3686)\to p\bar{p}\phi$

## TL;DR

This paper reports the first observation of the decay process $\psi(3686) o par{p}\phi$ with a measured branching fraction, and finds no evidence of a threshold enhancement previously observed in similar channels.

## Contribution

It presents the first measurement of the branching fraction for $\psi(3686) o par{p}\phi$ and sets an upper limit on the related threshold enhancement decay.

## Key findings

- Branching fraction of $\\psi(3686)\to p\bar{p}\phi$ measured as $(6.06\pm0.38\pm0.48)\times10^{-6}$
- No threshold enhancement observed in $\\psi(3686)\to p\bar{p}\phi$
- Upper limit of $1.82\times10^{-7}$ on $\\psi(3686)\to X(p\bar{p})\phi$

## Abstract

Using a data sample of $4.48\times10^{8}$ $\psip$ events collected with the BESIII detector, we present a first observation of $\psi(3686)\to p\bar{p}\phi$, and we measure its branching fraction to be $[6.06\pm0.38 ($stat.$) \pm 0.48 ($syst.$)]\times10^{-6}$. In contrast to the earlier discovery of a threshold enhancement in the $p\bar{p}$-mass spectrum of the channel $J/\psi\to\gamma p\bar p$, denoted as $X(p\bar{p})$, we do not find a similar enhancement in $\psi(3686)\to p\bar{p}\phi$. An upper limit of $1.82\times10^{-7}$ at the $90\%$ confidence level on the branching fraction of $\psi(3686)\to X(p\bar{p})\phi\to p\bar{p}\phi$ is obtained.