The so called R-value is directly linked to the number of existing quark-colors – so the number of different charges of the strong force put together.
You can learn how exactly that connection is build and what the R-value is in the following worksheet.
To experimentally determine the R-value – and from that the number of quark-colors – we want to assign the events from the Belle II detector to the different physical processes.
First look at the example events before testing your newly gained knowledge in the practice task.
If that works out well, you should be ready for the main task where you’ll measure the actual R-value.