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.
Search for CP and P violating pseudoscalar decays into pi pi
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2011-01-01
Abstract
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.
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PRD84(2011)032006 - Search for CP and P violating pseudoscalar decays into pipi.pdf
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