ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 84, p. -
Search for CP and P violating pseudoscalar decays into ππ
Using a sample of (225.2±2.8)×106 J/ψ events collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider, CP and P violating decays of η, η′, and ηc into π+π- and π0π0 are searched for in J/ψ radiative decays. No significant η, η′, or ηc signal is observed, and 90% confidence level upper limits of B(η→π+π-)<3.9×10-4, B(η′→π+π-)<5. 5×10-5, B(ηc→π+π -)<1.3×10-4, B(η→π0π0)<6. 9×10-4, B(η′→π0π0)<4. 5×10-4, and B(ηc→π0π0)<4. 2×10-5 are obtained. © 2011 American Physical Society.