Search for the isospin violating decay $Y(4260)\rightarrow J/\psi \eta \pi^{0}$

TL;DR

This study searches for the isospin violating decay of Y(4260) into J/psi, eta, and pi0 using BESIII data at various energies, but finds no signal and sets upper limits on the cross section.

Contribution

First search for the isospin violating decay Y(4260) to J/psi eta pi0 with BESIII data, establishing upper limits on the process's cross section.

Findings

No signal observed for the decay.

Upper limits on cross section range from 0.9 to 3.6 pb.

Provides constraints on isospin violation in Y(4260) decays.

Abstract

Using data samples collected at center of mass energies of $\sqrt{s}$ = 4.009, 4.226, 4.257, 4.358, 4.416 and 4.599 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the isospin violating decay $Y(4260)\rightarrow J/\psi \eta \pi^{0}$. No signal is observed, and upper limits on the cross section $\sigma(e^{+}e^{-}\rightarrow J/\psi \eta \pi^{0})$ at the 90\% confidence level are determined to be 3.6, 1.7, 2.4, 1.4, 0.9 and 1.9 pb, respectively.