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Search for the isospin violating decay Y(4260)rightarrow J/psi η π⁰
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arxiv 1505.00539 v2 pith:HQTJ5IPY submitted 2015-05-04 hep-ex
Search for the isospin violating decay Y(4260)rightarrow J/psi η π⁰
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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.
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