Search for CP and $P$ violating pseudoscalar decays into $ππ$

Details Search for CP and $P$ violating pseudoscalar decays into $ππ$ Search for CP and $P$ violating pseudoscalar decays into $ππ$

2011-06-25

arxiv.org/abs/1106.5118v1

Phys.Rev.D84:032006,2011

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 6 figures

Scientific paper

10.1103/PhysRevD.84.032006

Using a sample of $(225.2\pm 2.8)\times 10^6$ $J/\psi$ events collected with the Beijing Spectrometer (BESIII) at the Beijing Electron-Positron Collider, CP and $P$ violating decays of $\eta$, $\eta'$ and $\etac$ into $\pi^+\pi^-$ and $\pi^0 \pi^0$ are searched for in $\jpsi$ radiative decays. No significant $\eta$, $\eta'$ or $\etac$ signal is observed, and 90% confidence level upper limits of $\BR(\eta \to \pi^+\pi^-)<3.9\times 10^{-4}$, $\BR(\eta' \to \pi^+\pi^-)<5.5\times 10^{-5}$, $\BR(\etac \to \pi^+\pi^-)<1.3\times 10^{-4}$, $\BR(\eta \to \pi^0 \pi^0)<6.9\times 10^{-4}$, $\BR(\eta' \to \pi^0 \pi^0)<4.5\times 10^{-4}$ and $\BR(\etac \to \pi^0 \pi^0)<4.2\times 10^{-5}$ are obtained.

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