BESIII measurements#
\(J/\psi\) samples#
Year |
Round |
\(N_{J/\psi}\) (\(\times 10^6\)) |
Uncertainty |
Location |
|---|---|---|---|---|
2009 |
|
\(233.7 \pm 1.4\) |
\(0.63\%\) |
|
2012 |
|
\(1\,086.9 \pm 6.0\) |
\(0.55\%\) |
|
2017–2018 |
|
\(4.6 \times 10^3\) |
(\(0.53\%\)) |
|
2018–2019 |
|
\(4.1 \times 10^3\) |
($0.53%) |
|
See Chinese Physics C Vol. 41, No. 1 (2017) 013001 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.