Search for hadronic transitionχcJ→ηcπ+π−and observation ofχcJ→KK¯πππ

Abstract

Hadronic transitions of χcJ→ηcπ+π− (J=0, 1, 2) are searched for using a sample of 1.06×108 ψ(3686) events collected with the BESIII detector at the BEPCII storage ring. The ηc is reconstructed with KS0K±π∓ and K+K−π0 final states. No signals are observed in any of the three χcJ states in either ηc decay mode. At the 90% confidence level, the upper limits are determined to be B(χc0→ηcπ+π−)<0.07%, B(χc1→ηcπ+π−)<0.32%, and B(χc2→ηcπ+π−)<0.54%. The upper limit of B(χc1→ηcπ+π−) is lower than the existing theoretical prediction by almost an order of magnitude. The branching fractions of χcJ→KS0K±π∓π+π−, K+K−π+π−π0, ωK+K−, and ϕπ+π−π0 J=0, 1, 2) are measured for the first time.Received 23 August 2012DOI:https://doi.org/10.1103/PhysRevD.87.012002© 2013 American Physical Society