11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Substructures of heavy flavor jets in $pp$ and Pb+Pb collisions at $\sqrt{s}$ = 5.02~TeV

28.03.2023, 18:15

2h 15m

Stadthalle (Aschaffenburg)

Gremium: JETS-6

Poster Jets and their modification in QCD matter Poster Session

Sprecher

Qing Zhang (Central China Normal University) Wei Dai (China university of Geosciences)

Beschreibung

Groomed jet substructure measurements, the momentum splitting fraction $z_g$ and the groomed jet radius $R_g$, for inclusive, D$^0$-tagged and B$^0$-tagged jets in $pp$ and central Pb+Pb collisions at $\sqrt{s}=5.02$ TeV are investigated. Theoretical results for light-quark initiated and gluon initiated jets are provided as references though experimentally indistinguishable for now. Charged jets are constrained in a relative low transverse momentum interval 15 $\leq p_{\rm T}^{\rm jet\ ch} <$ 30 GeV/$c$ where the QCD emissions are sensitive to mass effects. The mass hierarchy manifests in $z_g$ distributions in both parton showering and jet quenching indicating steeper splitting functions of heavier partons. The flavour differences induced by Casimir factors do not contribute to $z_g$ distributions. Balanced splittings are suppressed due to jet quenching effects. The competition between flavor effects and mass effects to emission-angle distributions is directly observed for the first time. In both $pp$ and Pb+Pb collisions, the mass hierarchy in $R_g$ of inclusive, D$^0$-tagged and B$^0$-tagged jets is broken due to contributions from gluon-initiated jets. $R_g$ shift to more broaden distributions due to medium-induced modifications.

Affiliation

Central China Normal University