You have already added 0 works in your ORCID record related to the merged Research product.

You have already added 0 works in your ORCID record related to the merged Research product.

```
<script type="text/javascript">
<!--
document.write('<div id="oa_widget"></div>');
document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=undefined&type=result"></script>');
-->
</script>
```

__helpdesk@openaire.eu__

You have already added 0 works in your ORCID record related to the merged Research product.

You have already added 0 works in your ORCID record related to the merged Research product.

# Partial wave analysis of J/ψ→γηη′

__Publication__

Based on a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γηη′ is performed. An isoscalar state with exotic quantum numbers JPC=1−+, denoted as η1(1855), has been observed for the first time with statistical significance larger than 19σ. Its mass and width are measured to be (1855±9−1+6) MeV/c2 and (188±18−8+3) MeV, respectively. The first uncertainties are statistical and the second are systematic. The product branching fraction B(J/ψ→γη1(1855))B(η1(1855)→ηη′) is measured to be (2.70±0.41−0.35+0.16)×10−6. In addition, an upper limit on the ratio of branching fractions B(f0(1710)→ηη′)/B(f0(1710)→ππ) is determined to be 1.61×10−3 at 90% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.

citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average Powered byBIP!

**BIP!**

**BIP!**

Based on a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γηη′ is performed. An isoscalar state with exotic quantum numbers JPC=1−+, denoted as η1(1855), has been observed for the first time with statistical significance larger than 19σ. Its mass and width are measured to be (1855±9−1+6) MeV/c2 and (188±18−8+3) MeV, respectively. The first uncertainties are statistical and the second are systematic. The product branching fraction B(J/ψ→γη1(1855))B(η1(1855)→ηη′) is measured to be (2.70±0.41−0.35+0.16)×10−6. In addition, an upper limit on the ratio of branching fractions B(f0(1710)→ηη′)/B(f0(1710)→ππ) is determined to be 1.61×10−3 at 90% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.