6–13 Jul 2022
Bologna, Italy
Europe/Rome timezone

Identification of b-jets using QCD-inspired observables

8 Jul 2022, 15:15
15m
Room 1 (Europa Auditorium)

Room 1 (Europa Auditorium)

Parallel Talk Strong interactions and Hadron Physics Strong interactions and Hadron Physics

Speaker

Federico Sforza (Istituto Nazionale di Fisica Nucleare)

Description

The identification of the origin of hadronic jets is a key aspect in particle physics at hadron colliders. In this talk I will discuss the separation of hadronic jets that contain bottom quarks (b-jets) from jets featuring only light partons using a newly developed approach reported in arXiv:2202.05082 [hep-ph].
This approach exploits QCD-inspired jet substructure observables, such as one-dimensional jet angularities and the two-dimensional primary Lund plane, as inputs to modern machine-learning algorithms to efficiently separate b-jets from light ones. In order to test our tagging procedure, we consider simulated events where a Z boson is produced is association with jets and show that using jet angularities as an input for a deep neural network, as well as using images obtained from the primary Lund jet plane as input to a convolutional neural network, one can achieve tagging accuracy comparable with the accuracy of track-based taggers used by the LHC experiments. We argue that the complementary usage of the track-based taggers together with the ones based upon QCD-inspired observables could improve b-tagging accuracy.

In-person participation Yes

Primary authors

Charanjit Kaur Federico Sforza (Istituto Nazionale di Fisica Nucleare) Oleh Fedkevych (Istituto Nazionale di Fisica Nucleare) Simone Marzani (Istituto Nazionale di Fisica Nucleare)

Presentation materials