Measurement of the Matrix Element for the Decay $η^{\prime} \to η π^+π^-$

Details Measurement of the Matrix Element for the Decay $η^{\prime} \to η π^+π^-$ Measurement of the Matrix Element for the Decay $η^{\prime} \to η π^+π^-$

2010-12-06

arxiv.org/abs/1012.1117v2

Phys.Rev.D83:012003,2011

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 5 figures, published in PRD

Scientific paper

10.1103/PhysRevD.83.012003

The Dalitz plot of $\eta^{\prime} \to \eta \pi^+ \pi^-$ decay is studied using $(225.2\pm2.8)\times 10^6$ $\jpsi$ events collected with the BESIII detector at the BEPCII $e^+e^-$ collider. With the largest sample of $\eta^{\prime}$ decays to date, the parameters of the Dalitz plot are determined in a generalized and a linear representation. Also the branching fraction of $\jpsi \to \gamma \eta^{\prime}$ is determined to be $(4.84\pm0.03\pm0.24)\times 10^{-3}$, where the first error is statistical and the second systematic.

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