Identifying Heavy-Flavor Jets Using Vectors of Locally Aggregated Descriptors

Jana Bielčíková (1) , Raghav Kunnawalkam Elayavalli (2) , Georgy Ponimatkin (1) , Jörn H. Putschke (2) , Josef Šivic (3)

1 Nuclear Physics Institute [Prague]
2 Wayne State University [Detroit]
3 WILLOW - Models of visual object recognition and scene understanding

Jets of collimated particles serve a multitude of purposes in high energy collisions. Recently, studies of jet interaction with the quark-gluon plasma (QGP) created in high energy heavy ion collisions are of growing interest, particularly towards understanding partonic energy loss in the QGP medium and its related modifications of the jet shower and fragmentation. Since the QGP is a colored medium, the extent of jet quenching and consequently, the transport properties of the medium are expected to be sensitive to fundamental properties of the jets such as the flavor of the parton that initiates the jet. Identifying the jet flavor enables an extraction of the mass dependence in jet-QGP interactions. We present a novel approach to tagging heavy-flavor jets at collider experiments utilizing the information contained within jet constituents via the model architecture. We show the performance of this model in proton-proton collisions at center of mass energy √(s) = 200 GeV as characterized by common metrics and showcase its ability to extract high purity heavy-flavor jet sample at various jet momenta and realistic production cross-sections including a brief discussion on the impact of out-of-time pile-up. Such studies open new opportunities for future high purity heavy-flavor measurements at jet energies accessible at current and future collider experiments.

Mots clés: Heavy-Flavor Jets; Machine Learning; Particle Descriptors; Secondary Vertex Detectors; heavy quark: jet; jet: energy; jet: quenching; jet: momentum; showers: jet; energy: high; quark gluon: plasma; heavy ion: scattering; parton; transport theory; mass dependence; fragmentation; new particle; energy loss; collimator; numerical calculations

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Jana Bielčíková, Raghav Kunnawalkam Elayavalli, Georgy Ponimatkin, Jörn H. Putschke, Josef Šivic. Identifying Heavy-Flavor Jets Using Vectors of Locally Aggregated Descriptors. JINST, 2021, 16 (03), pp.P03017. ⟨10.1088/1748-0221/16/03/P03017⟩. ⟨hal-02628002⟩