Exploring b-jet properties in Pb+Pb collisions with the ATLAS experiment at the LHC

A few instants after the Big Bang, the universe consisted of a plasma of elementary particles called quarks and gluons (QGP), which became building blocks of matter. In order to recreate and study them, it is needed to collide nuclei of atoms. One of these attempts is the collision of heavy ions Pb+Pb at LHC that creates a bunch of particles that form jets. These jets are excellent probes of QGP because they provide a tomographic image of the QGP created in these collisions. In the present work, we searched to prepare a toy event display showing b-jets in Pb+Pb collisions by using Monte Carlo simulation of √S_NN=5.02 TeV in the ATLAS detector. To achieve it, we used the ROOT framework to read the tree in the simulations file. This file contained information about reconstructed particles, reconstructed jets, and truth information about particles and jets within the ATLAS detector configuration. We identified about 60 different particles and antiparticles corresponding to b-hadron, and c-hadron particles, and their respective children. Furthermore, we plotted the b-jets cones and the decay tracks, including b- and c-hadrons. We also classified chains of b- and c-hadron decay vertices in b-jets. Secondary interactions with the detector material were also found but were very rare. This toy display will be a useful tool for developing Pb+Pb b-tagging algorithms in ATLAS, specially in the current Run.