ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, vol. 86, p. -
Experimental study of ψ ′ decays to K +K -π0 and K +K -η
Using (106±4)×106 ψ ′ events accumulated with the BESIII detector at the BEPCII e+ e- collider, we present measurements of the branching fractions for ψ ′ decays to K +K -π0 and K +K -η. In these final states, the decay ψ ′→K2* (1430)+K -+c.c. is observed for the first time, and its branching fraction is measured to be (7.12±0.62(stat)-0.61+1. 13(syst))×10 -5, which indicates a violation of the helicity selection rule in ψ ′ decays. The branching fractions of ψ ′→K*(892) +K -+c.c., η, and π0 are also measured. The measurements are used to test the QCD predictions on charmonium decays. © 2012 American Physical Society.