This note summarizes the lectures given in the tutorial session of the
Introduction to the Terascale school at DESY on March 2023. The target audience
are advanced bachelor and master physics students. The tutorial aims to best
prepare the students for starting an LHC experimental physics thesis. The cross
section of the top quark pair production is detailed alongside with the
reconstruction of the invariant masses of the top quark as well as of the W
and Z bosons. The tutorial uses ideas and CMS open data files from the CMS
HEP Tutorial written by C. Sander and A. Schmidt, but is entirely rewritten so
that it can be run in Google Colab Cloud in a columnar style of analysis with
python. In addition, a minimal C/C++ version of a simple event-loop analysis
relying on ROOT is exampled. The code is kept as short as possible with
emphasis on the transparency of the analysis steps, rather than the elegance of
the software, having in mind that the students will in any case need to rewrite
their own custom analysis framework
