Abstract
The recent results about charmonium and charmonium-like spectroscopy and decays from BESIII are presented in this talk. We report the observation of X(3872) from Y(4260) radiative transition, π+π-hc line shape measurement and Zc states. In addition, the accurate measurement of ηc parameters, the analysis on hc exclusive decays into γηc, and the first observation of the M1 transition ψ′ → γηc(2S) are included in this talk.
Highlights
In 2009, the upgraded Beijing spectrometer (BESIII)1at Beijing Electron Positron Collider (BEPCII) started to take data
A lot of data at different energy points above the 4 GeV are taken for studying the charmoniumlike states, such as X(3872), Zc states
A simultaneous fit that incorporates interference between the signal reaction and a non-resonant radiative background determine the mass and width of ηc to be mηc = (2984.3 ± 0.6 ± 0.6) MeV/c2 and. This is an Open Access article published by World Scientific Publishing Company
Summary
In 2009, the upgraded Beijing spectrometer (BESIII)1at Beijing Electron Positron Collider (BEPCII) started to take data. A simultaneous fit that incorporates interference between the signal reaction and a non-resonant radiative background determine the mass and width of ηc to be mηc = (2984.3 ± 0.6 ± 0.6) MeV/c2 and. This is an Open Access article published by World Scientific Publishing Company. The hc is the P-wave spin singlet charmonium below open-charm threshold It could be studied through the mode of ψ → π0hc, hc → γηc. In BESIII, sixteen kinds of exclusive hadronic final states are used to reconstruct ηc.[3] To extract the hc resonant parameters and the yield for each ηc decay channel, the sixteen π0 recoil mass distributions are fitted simultaneously with a binned maximum likelihood method.
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