BESIII measurements
\(J/\psi\) samples
| Year | Round | \(N_{J/\psi}\) (\(\times 10^6\)) | Uncertainty | Location |
|---|---|---|---|---|
| 2009 | 02 |
\(233.7 \pm 1.4\) | \(0.63\%\) | /besfs3/offline/data/703-1/jpsi/round02/dst |
| 2012 | 05 |
\(1\,086.9 \pm 6.0\) | \(0.55\%\) | /besfs3/offline/data/703-1/jpsi/round05/dst |
| 2017–2018 | 11 |
\(4.6 \times 10^3\) | (\(0.53\%\)) | /bes**3fs**/offline/data/704-1/jpsi/round11/dst |
| 2018–2019 | 12 |
\(4.1 \times 10^3\) | ($0.53%) | /bes**3fs**/offline/data/704-1/jpsi/round12/dst |
- See “Determination of the number of \(J/\psi\) events with inclusive \(J/\psi\) decays” [1] for the calculation of the number of \(J/\psi\) events in the 2009 and 2012 data samples. The total number for both is \(N_{J/\psi} = (1310.6\pm7.0) \times 10^6\), which is \(0.53\%\) systematic uncertainty.
- See an indication of the number of \(J/\psi\) events in this presentation (requires login). Systematic uncertainty is not yet determined, but could be comparable.
References
[1]
M. Ablikim et al., “Determination of the number of \(J/\psi\) events with inclusive \(J/\psi\) decays,” Chinese Phys. C, vol. 41, no. 1, p. 013001, Jan. 2017, 10.1088/1674-1137/41/1/013001.