Changes between Initial Version and Version 1 of FAQNormalMode

Timestamp:

Nov 11, 2021, 12:02:09 AM (4 years ago)

Author:

jackaraz

Comment:

add differential xsec plotting

FAQNormalMode

@@ +1 @@
+== Frequently Asked Questions: Normal Mode ==
+
+This page includes remedies to the queries that we get on a daily basis. Hope the answer to your next question will be included here in the future.
+
+----
+
+* '''How can I create a differential cross-section plot?'''
+
+Okay, first of all, let's assume that you know what plots you want to prepare and you know that MadAnalysis assumes the cross-section is always in pb. So let's start running !MadAnalysis.
+{{{
+$ ./bin/ma5
+}}}
+You should be able to see that all necessary functionality is available to you. Now import your sample and set its cross-section
+{{{
+ma5>import samples/zz.lhe.gz as my_sample
+ma5>set my_sample.xsection = 123
+}}}
+note that if you press tab after {{{ set my_sample.}}} you will see all the available options for the sample. Now let's plot transverse momentum for leading positron.
+{{{
+ma5>plot PT(e+[1])
+}}}
+Note that automatically this will create a {{{selection}}}
+{{{
+ma5>display selection[1]
+MA5:   * Plot: PT ( e+[1] )
+MA5:   * Binning: nbins=100, xmin=0.0, xmax=1000.0, regions=[]
+MA5:   * Stacking method: stacked
+MA5:   * Particles under consideration: finalstate
+MA5:   * Particle ordering: PTordering
+}}} 
+''Note try pressing tab after everything, you will see available options!'' By default, MadAnalysis is designed to plot the number of events, not cross-section so let's change the luminosity value to get the cross-section. Note that luminosity, by default, is always inverse fb. Also lets modify the y-axis label with proper units.
+{{{
+ma5>set main.lumi = 1e-3 * 10 # see the bin size up there
+set selection[1].titleY = "#frac{d#sigma}{dp_{T}} [pb/GeV]"
+}}}
+Note that my rendering engine for histogramming is ROOT that's why I used ROOT's LaTeX convention if you have a different engine, make sure that you are using proper LaTeX convention. And here is the final result:
+