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

Loading...
Thumbnail Image
If you need an accessible version of this item, please email your request to iusw@iu.edu so that they may create one and provide it to you.

Date

2012

Journal Title

Journal ISSN

Volume Title

Publisher

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.

Description

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

DOI

Link(s) to data and video for this item

Relation

Rights

© 2012 American Physical Society.

Type

Article