Measurements of the mass and width of the $\eta_c$ using the decay $\psi(3686)\rightarrow\gamma\eta_c$

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Date
2012
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American Physical Society
Abstract
The mass and width of the lowest-lying $S$-wave spin singlet charmonium state, the $η_c$, are measured using a data sample of $1.06×10^8 ψ(3686)$ decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, $ψ(3686)→γη_c$, and a nonresonant radiative background to describe the line shape of the $η_c$ successfully. We measure the $η_c$ mass to be $2984.3±0.6±0.6  \text{MeV}/c^2$ and the total width to be $32.0±1.2±1.0  \text{MeV}$, where the first errors are statistical and the second are systematic.
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Keywords
Charmonium, Data sample, Line shape, Nonresonant, Spin singlets, Atomic physics, Physics, Systematic errors
Citation
Ablikim, M., Achasov, M. N., Alberto, D., Ambrose, D. J., An, F. F., An, Q., . . . Zuo, J. X. (2012). Measurements of the mass and width of the $\eta_c$ using the decay $\psi(3686)\rightarrow\gamma\eta_c$. Physical Review Letters, 108(22), 222002. http://dx.doi.org/10.1103/PhysRevLett.108.222002
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© 2012 American Physical Society.
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Article