ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -
Search for ηc(2S)hc→pp̄ decays and measurements of the χcJ→pp̄ branching fractions
Using a sample of 1.06×108ψ(3686) events collected with the BESIII detector at BEPCII, the decays ηc(2S)→pp̄ and hc→pp̄ are searched for, where ηc(2S) and hc are reconstructed in the decay chains ψ(3686) →γηc(2S), ηc(2S)→pp̄ and ψ(3686)→π0hc, hc→pp̄, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→pp̄)<1.4×10-6 and B(ψ(3686)→π0hc)×B(hc→pp̄) <1.3×10-7 at the 90% C.L.. The branching fractions for χcJ→pp̄ (J=0, 1, 2) are also measured to be (24.5±0.8±1.3,8.6±0.5±0.5,8.4±0.5±0.5) ×10-5, which are the world's most precise measurements. © 2013 American Physical Society.