Only for simulation!

The QCD samples suffers from a bad simulation of the pile-up, in the sense that it introduces unrelastic contributions even at high scale. This has two bad effects:

• a wrong normalisation, where the cross section of the minimum-bias events is not taken into accout;
• a lack of statistics at high transverse momentum.

The goal of the current subsystem is to correc the simulation.

The correction is performed in two steps:

• first events are removed when the hard scale of a pile-up interaction is larger than the hard scale of the matrix elements;
• then an additional cut is still applied to remove remaing outliers.

Warning: for the moment, the code is only tuned for the Pythia 8 flat sample for 2017.

<tt>getPUstaub</tt>

Test and tune the cut-offs, useful for the next command as well.

<tt>applyPUstaubSauger</tt>

Filter the n-tuples.