Background
When a parent particle decays, it sometimes produces a spray of jets. Jets are a cone of hadrons that are produced from a collision. You can add together the 4-momenta of the jets to find the mass of the parent particle.
$$\mathbf{P_{\rm parent}} = \mathbf{P_{\rm jet 0}} + \mathbf{P_{\rm jet 1}} + \mathbf{P_{\rm jet 2}} + ...$$Using the same method as for the previous reconstruction activities, add the 4-vectors of the jets and determine the mass and type of the parent particle. Make a histogram of the mass. Do this for the raw data file data.hdf5 and the top quark MC file ttbar.hdf5 at least, but consider doing the same for all the rest of the CMS MC files to see if there is any similar structure. The process of downloading these files is discussed in the DownloadData notebook.
Hint!
Make sure you do this for all the combinations of jets! Each collision can produce differing numbers of jets, find all the three combinations of jets to find the parent particle.
Your histogram should look something like the following sketch. The value of the peak should be the mass of the parent particle. Check your answer!
In [ ]:
from IPython.display import Image
Image(filename='images/discovering_sketch_B.jpeg')
In [ ]:
# Your code here
In [ ]:
# Your code here