lhcb / opendata-project Goto Github PK

Thanks for your interest in this project 😀

Please use this as a forum for discussing problems and results with other users.

kind developers

I'm trying to follow the step of your analysis, but using RDataFrame.
I noticed something strange regarding the charge of the three kaons.
When I plot the invariant mass m23 of the kaons with the same charge, I saw an unespected shape in the distribution.
I look at the following article here: article
At page 7, the plot of m13 is very similar to the plot of m12 that I produced with the analysis, however in the article m13 is the invariant mass of the pair k+k-.

I have the feeling that in the datatree the charges are swapped. Is anyone of you kind enough to check the correctness of the data?

The plot that I made is the following:
e.pdf

I notice that the kaon with the same charge are always H2 and H3, as you can see in the data tree here: