Recent results on light hadron spectroscopy at BESIII

Abstract

Recent results on light hadron spectroscopy based on 2.25×108J/ψ events and 1.06×108ψ′ events taken by BESIII detector operating at BEPCII e+e− collider are presented in this talk. A spin-parity analysis of pp¯ mass threshold enhancement has been firstly performed in J/ψ and ψ′ radiative decays, and the spin-parity of the state near the pp¯ mass threshold enhancement is determined to be 0−+. For J/ψ→γπ0π+π− and J/ψ→γπ0π0π0, there is a very narrow f0(980) width and we observe the large isospin violating decay η(1405)→f0(980)π0 for the first time. The branching ratio is two times larger than the world average value in η′→π0π0π0. A preliminary partial wave analysis of J/ψ→γηη gives the results that f0(1710) and f0(2100) are dominant scalars and that f0(1500) exists with a significance of 8.2σ. A study of ωϕ mass threshold enhancement in J/ψ→γωϕ is also performed by partial wave analysis.