Jet Flavour Classification Using DeepJet

The Standard Model of particle physics (SM) [1, 2] is a remarkably effective theory, able to describe the experimental observations made thus far in high energy physics with unprecedented precision and completeness. Despite its success however, this model fails to explain several observations like the baryon asymmetry and the presence of dark matter, which inspires searches for extensions to the SM. The study of the recently discovered [3-5] Higgs boson [6-11], and the search for extensions of the electroweak sector are two of the most active research sectors in the field. Because of the flavour asymmetry associated to production and decay processes in each case, the ability to classify jets originating from heavy-flavour (bottom and charm) quarks is important. Heavy-flavour (HF) jets contain an open-bottom or open-charm hadron as a result of the fragmentation process. This hadron carries a large fraction of the initial parton momentum. HF hadrons also have a sizeable lifetime, with a of 0.5 mm and 0.3 mm for bottom and charm, respectively.