From 7bb5890059c21cba739f6073531f18f978615b55 Mon Sep 17 00:00:00 2001 From: Alejandro Gomez Espinosa Date: Wed, 20 Dec 2023 13:56:16 -0500 Subject: [PATCH] update --- _episodes/02-Pileup_jetID.md | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/_episodes/02-Pileup_jetID.md b/_episodes/02-Pileup_jetID.md index dfaeb350..1a6cc8d9 100644 --- a/_episodes/02-Pileup_jetID.md +++ b/_episodes/02-Pileup_jetID.md @@ -75,7 +75,34 @@ There are 12 interactions before and 3 after. ## Pileup reweighting -(FIXME) +Here we are going to produce a file containing the weights used for pileup reweighting using +`json-pog` and `correctionlib`. + +> ## Open a notebook +> +> For this part open the notebook called `Jet_Types_and_Algorithms.ipynb` and run the Exercise 2. +{: .checklist} + +> ## Question 2.4 +> Ask yourself what pileup reweighting is doing. How large do you expect the pileup weights to be? +{: .challenge} + +> ## Question 2.5 +> In what unit will the x-axis be plotted? Another way of asking this is what pileup variable can be measured in both data and MC and is fairly robust? +{: .challenge} + +> ## Solution 2.5 +> The x-axis is plotted as a function of $\mu$ as this is a true measurement of pileup (additional interactions) and not just some variable which is correlated with pileup. Other options might have been $N_{PV}$, which has an efficiency which is less than 100%, and $\rho$, which assumes that the pileup energy density is uniform. We also get different values of $\rho$ if we measure it for different regions in $\eta$ (i.e. $|\eta|<3$ or $|\eta|<5$). +> +> Zmumu_npv +> Zmumu_rho +> Zmumu_npv_nputruth +> Zmumu_rho_nputruth +{: .solution} + +> ## Question 2.6 +> Why do the green and red histograms end arount $\mu\approx38$? +{: .challenge}