Speaker
Description
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. 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 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.
| Theory / experiment | Theory |
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