ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 81, p. -
Branching fraction measurements of χc0 and χc2 to π0π0 and ηη
Using a sample of 1.06×108 ψ′ decays collected by the BESIII detector, χc0 and χc2 decays into π0π0 and ηη are studied. The branching fraction results are Br(χc0→π 0π0)=(3.23±0.03±0.23±0.14)×10-3, Br(χc2→π0π0)=(8.8±0.2±0.6±0.4)×10 -4, Br(χc0→ηη)=(3.44±0.10±0. 24±0.2)×10-3, and Br(χc2→ηη)=(6. 5±0.4±0.5±0.3)×10-4, where the uncertainties are statistical, systematic due to this measurement, and systematic due to the branching fractions of ψ′→ γχcJ. The results provide information on the decay mechanism of χc states into pseudoscalars. © 2010 The American Physical Society.