Background rejection / data analysis

[uttunni]

Hi,

How can one calculate background rejection from a background sample applying cuts ??

 

[Orodruin]

Compare the number of sampled background events which pass the cuts to the total number of sampled background events.

 

[uttunni]

Hi,
So what is background efficiency? Is background efficiency and background rejection are the same ?

 

[mfb]

They are different ways to describe the same thing. If 5% of your background events pass the selection (1 out of 20), you have a background efficiency of 5% and a background rejection of 20.